diff --git a/.gitignore b/.gitignore
index 45174e387b..99bc180f89 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,7 +18,3 @@ analysis.json
 
 # NPM artifact
 polymer-polymer-*.tgz
-
-# Typings are generated upon publish to NPM, except for one.
-*.d.ts
-!interfaces.d.ts
diff --git a/gen-tsd.json b/gen-tsd.json
deleted file mode 100644
index 475d21b2cf..0000000000
--- a/gen-tsd.json
+++ /dev/null
@@ -1,46 +0,0 @@
-{
-  "excludeFiles": [
-    "dist/**",
-    "externs/**",
-    "gulpfile.js",
-    "test/**",
-    "util/**",
-    "index.html"
-  ],
-  "excludeIdentifiers": [
-    "templatizedBase",
-    "setAttribute"
-  ],
-  "removeReferences": [
-    "../shadycss/apply-shim.d.ts",
-    "../shadycss/custom-style-interface.d.ts"
-  ],
-  "renameTypes": {
-    "Polymer_PropertyEffects": "PropertyEffects",
-    "PolymerDomApi": "DomApi",
-    "PolymerDomApi.ObserveHandle": "FlattenedNodesObserver"
-  },
-  "autoImport": {
-    "./interfaces": [
-      "PolymerElementPropertiesMeta",
-      "PolymerElementProperties",
-      "PolymerInit",
-      "StampedTemplate",
-      "NodeInfo",
-      "TemplateInfo",
-      "LiteralBindingPart",
-      "MethodArg",
-      "MethodSignature",
-      "ExpressionBindingPart",
-      "BindingPart",
-      "Binding",
-      "AsyncInterface",
-      "GestureRecognizer",
-      "IdleDeadline",
-      "PolymerElementConstructor"
-    ],
-    "./lib/utils/debounce.js": [
-      "Debouncer"
-    ]
-  }
-}
diff --git a/lib/elements/array-selector.d.ts b/lib/elements/array-selector.d.ts
new file mode 100644
index 0000000000..90e374e0bc
--- /dev/null
+++ b/lib/elements/array-selector.d.ts
@@ -0,0 +1,213 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+// tslint:disable:no-any describes the API as best we are able today
+
+import {PolymerElement} from '../../polymer-element.js';
+
+import {dedupingMixin} from '../utils/mixin.js';
+
+import {calculateSplices} from '../utils/array-splice.js';
+
+import {ElementMixin} from '../mixins/element-mixin.js';
+
+
+/**
+ * Element mixin for recording dynamic associations between item paths in a
+ * master `items` array and a `selected` array such that path changes to the
+ * master array (at the host) element or elsewhere via data-binding) are
+ * correctly propagated to items in the selected array and vice-versa.
+ *
+ * The `items` property accepts an array of user data, and via the
+ * `select(item)` and `deselect(item)` API, updates the `selected` property
+ * which may be bound to other parts of the application, and any changes to
+ * sub-fields of `selected` item(s) will be kept in sync with items in the
+ * `items` array.  When `multi` is false, `selected` is a property
+ * representing the last selected item.  When `multi` is true, `selected`
+ * is an array of multiply selected items.
+ */
+declare function ArraySelectorMixin<T extends new (...args: any[]) => {}>(base: T): T & ArraySelectorMixinConstructor & ElementMixinConstructor & PropertyEffectsConstructor & TemplateStampConstructor & PropertyAccessorsConstructor & PropertiesChangedConstructor & PropertiesMixinConstructor;
+
+import {ElementMixinConstructor} from '../mixins/element-mixin.js';
+
+import {PropertyEffectsConstructor, PropertyEffects} from '../mixins/property-effects.js';
+
+import {TemplateStampConstructor, TemplateStamp} from '../mixins/template-stamp.js';
+
+import {PropertyAccessorsConstructor, PropertyAccessors} from '../mixins/property-accessors.js';
+
+import {PropertiesChangedConstructor, PropertiesChanged} from '../mixins/properties-changed.js';
+
+import {PropertiesMixinConstructor, PropertiesMixin} from '../mixins/properties-mixin.js';
+
+interface ArraySelectorMixinConstructor {
+  new(...args: any[]): ArraySelectorMixin;
+}
+
+export {ArraySelectorMixinConstructor};
+
+interface ArraySelectorMixin extends ElementMixin, PropertyEffects, TemplateStamp, PropertyAccessors, PropertiesChanged, PropertiesMixin {
+
+  /**
+   * An array containing items from which selection will be made.
+   */
+  items: any[]|null|undefined;
+
+  /**
+   * When `true`, multiple items may be selected at once (in this case,
+   * `selected` is an array of currently selected items).  When `false`,
+   * only one item may be selected at a time.
+   */
+  multi: boolean|null|undefined;
+
+  /**
+   * When `multi` is true, this is an array that contains any selected.
+   * When `multi` is false, this is the currently selected item, or `null`
+   * if no item is selected.
+   */
+  selected: object|object[]|null;
+
+  /**
+   * When `multi` is false, this is the currently selected item, or `null`
+   * if no item is selected.
+   */
+  selectedItem: object|null;
+
+  /**
+   * When `true`, calling `select` on an item that is already selected
+   * will deselect the item.
+   */
+  toggle: boolean|null|undefined;
+
+  /**
+   * Clears the selection state.
+   */
+  clearSelection(): void;
+
+  /**
+   * Returns whether the item is currently selected.
+   *
+   * @param item Item from `items` array to test
+   * @returns Whether the item is selected
+   */
+  isSelected(item: any): boolean;
+
+  /**
+   * Returns whether the item is currently selected.
+   *
+   * @param idx Index from `items` array to test
+   * @returns Whether the item is selected
+   */
+  isIndexSelected(idx: number): boolean;
+
+  /**
+   * Deselects the given item if it is already selected.
+   *
+   * @param item Item from `items` array to deselect
+   */
+  deselect(item: any): void;
+
+  /**
+   * Deselects the given index if it is already selected.
+   *
+   * @param idx Index from `items` array to deselect
+   */
+  deselectIndex(idx: number): void;
+
+  /**
+   * Selects the given item.  When `toggle` is true, this will automatically
+   * deselect the item if already selected.
+   *
+   * @param item Item from `items` array to select
+   */
+  select(item: any): void;
+
+  /**
+   * Selects the given index.  When `toggle` is true, this will automatically
+   * deselect the item if already selected.
+   *
+   * @param idx Index from `items` array to select
+   */
+  selectIndex(idx: number): void;
+}
+
+export {ArraySelectorMixin};
+
+/**
+ * Element implementing the `ArraySelector` mixin, which records
+ * dynamic associations between item paths in a master `items` array and a
+ * `selected` array such that path changes to the master array (at the host)
+ * element or elsewhere via data-binding) are correctly propagated to items
+ * in the selected array and vice-versa.
+ *
+ * The `items` property accepts an array of user data, and via the
+ * `select(item)` and `deselect(item)` API, updates the `selected` property
+ * which may be bound to other parts of the application, and any changes to
+ * sub-fields of `selected` item(s) will be kept in sync with items in the
+ * `items` array.  When `multi` is false, `selected` is a property
+ * representing the last selected item.  When `multi` is true, `selected`
+ * is an array of multiply selected items.
+ *
+ * Example:
+ *
+ * ```js
+ * import {PolymerElement} from '@polymer/polymer';
+ * import '@polymer/polymer/lib/elements/array-selector.js';
+ *
+ * class EmployeeList extends PolymerElement {
+ *   static get _template() {
+ *     return html`
+ *         <div> Employee list: </div>
+ *         <dom-repeat id="employeeList" items="{{employees}}">
+ *           <template>
+ *             <div>First name: <span>{{item.first}}</span></div>
+ *               <div>Last name: <span>{{item.last}}</span></div>
+ *               <button on-click="toggleSelection">Select</button>
+ *           </template>
+ *         </dom-repeat>
+ *
+ *         <array-selector id="selector"
+ *                         items="{{employees}}"
+ *                         selected="{{selected}}"
+ *                         multi toggle></array-selector>
+ *
+ *         <div> Selected employees: </div>
+ *         <dom-repeat items="{{selected}}">
+ *           <template>
+ *             <div>First name: <span>{{item.first}}</span></div>
+ *             <div>Last name: <span>{{item.last}}</span></div>
+ *           </template>
+ *         </dom-repeat>`;
+ *   }
+ *   static get is() { return 'employee-list'; }
+ *   static get properties() {
+ *     return {
+ *       employees: {
+ *         value() {
+ *           return [
+ *             {first: 'Bob', last: 'Smith'},
+ *             {first: 'Sally', last: 'Johnson'},
+ *             ...
+ *           ];
+ *         }
+ *       }
+ *     };
+ *   }
+ *   toggleSelection(e) {
+ *     const item = this.$.employeeList.itemForElement(e.target);
+ *     this.$.selector.select(item);
+ *   }
+ * }
+ * ```
+ */
+declare class ArraySelector extends
+  ArraySelectorMixin(
+  PolymerElement) {
+}
+
+declare global {
+
+  interface HTMLElementTagNameMap {
+    "array-selector": ArraySelector;
+  }
+}
+
+export {ArraySelector};
diff --git a/lib/elements/custom-style.d.ts b/lib/elements/custom-style.d.ts
new file mode 100644
index 0000000000..2207ff1478
--- /dev/null
+++ b/lib/elements/custom-style.d.ts
@@ -0,0 +1,65 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+
+import {cssFromModules} from '../utils/style-gather.js';
+
+export {CustomStyle};
+
+/**
+ * Custom element for defining styles in the main document that can take
+ * advantage of [shady DOM](https://github.com/webcomponents/shadycss) shims
+ * for style encapsulation, custom properties, and custom mixins.
+ *
+ * - Document styles defined in a `<custom-style>` are shimmed to ensure they
+ *   do not leak into local DOM when running on browsers without native
+ *   Shadow DOM.
+ * - Custom properties can be defined in a `<custom-style>`. Use the `html` selector
+ *   to define custom properties that apply to all custom elements.
+ * - Custom mixins can be defined in a `<custom-style>`, if you import the optional
+ *   [apply shim](https://github.com/webcomponents/shadycss#about-applyshim)
+ *   (`shadycss/apply-shim.html`).
+ *
+ * To use:
+ *
+ * - Import `custom-style.html`.
+ * - Place a `<custom-style>` element in the main document, wrapping an inline `<style>` tag that
+ *   contains the CSS rules you want to shim.
+ *
+ * For example:
+ *
+ * ```html
+ * <!-- import apply shim--only required if using mixins -->
+ * <link rel="import" href="bower_components/shadycss/apply-shim.html">
+ * <!-- import custom-style element -->
+ * <link rel="import" href="bower_components/polymer/lib/elements/custom-style.html">
+ *
+ * <custom-style>
+ *   <style>
+ *     html {
+ *       --custom-color: blue;
+ *       --custom-mixin: {
+ *         font-weight: bold;
+ *         color: red;
+ *       };
+ *     }
+ *   </style>
+ * </custom-style>
+ * ```
+ */
+declare class CustomStyle extends HTMLElement {
+
+  /**
+   * Returns the light-DOM `<style>` child this element wraps.  Upon first
+   * call any style modules referenced via the `include` attribute will be
+   * concatenated to this element's `<style>`.
+   *
+   * @returns This element's light-DOM `<style>`
+   */
+  getStyle(): HTMLStyleElement|null;
+}
+
+declare global {
+
+  interface HTMLElementTagNameMap {
+    "custom-style": CustomStyle;
+  }
+}
diff --git a/lib/elements/dom-bind.d.ts b/lib/elements/dom-bind.d.ts
new file mode 100644
index 0000000000..f68b9e14ed
--- /dev/null
+++ b/lib/elements/dom-bind.d.ts
@@ -0,0 +1,51 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+
+import {PropertyEffects} from '../mixins/property-effects.js';
+
+import {OptionalMutableData} from '../mixins/mutable-data.js';
+
+import {GestureEventListeners} from '../mixins/gesture-event-listeners.js';
+
+import {hideElementsGlobally} from '../utils/hide-template-controls.js';
+
+export {DomBind};
+
+/**
+ * Custom element to allow using Polymer's template features (data binding,
+ * declarative event listeners, etc.) in the main document without defining
+ * a new custom element.
+ *
+ * `<template>` tags utilizing bindings may be wrapped with the `<dom-bind>`
+ * element, which will immediately stamp the wrapped template into the main
+ * document and bind elements to the `dom-bind` element itself as the
+ * binding scope.
+ */
+declare class DomBind extends
+  PropertyEffects(
+  OptionalMutableData(
+  GestureEventListeners(
+  HTMLElement))) {
+
+  /**
+   * @param name Name of attribute that changed
+   * @param old Old attribute value
+   * @param value New attribute value
+   * @param namespace Attribute namespace.
+   */
+  attributeChangedCallback(name: string, old: string|null, value: string|null, namespace: string|null): void;
+  connectedCallback(): void;
+  disconnectedCallback(): void;
+
+  /**
+   * Forces the element to render its content. This is typically only
+   * necessary to call if HTMLImports with the async attribute are used.
+   */
+  render(): void;
+}
+
+declare global {
+
+  interface HTMLElementTagNameMap {
+    "dom-bind": DomBind;
+  }
+}
diff --git a/lib/elements/dom-if.d.ts b/lib/elements/dom-if.d.ts
new file mode 100644
index 0000000000..fda395270e
--- /dev/null
+++ b/lib/elements/dom-if.d.ts
@@ -0,0 +1,169 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+
+import {PolymerElement} from '../../polymer-element.js';
+
+import {Debouncer} from '../utils/debounce.js';
+
+import {enqueueDebouncer, flush} from '../utils/flush.js';
+
+import {microTask} from '../utils/async.js';
+
+import {root} from '../utils/path.js';
+
+import {hideElementsGlobally} from '../utils/hide-template-controls.js';
+
+import {showHideChildren, templatize} from '../utils/templatize.js';
+
+declare class DomIfBase extends PolymerElement {
+  _templateInfo: TemplateInfo|undefined;
+
+  /**
+   * A boolean indicating whether this template should stamp.
+   */
+  if: boolean|null|undefined;
+
+  /**
+   * When true, elements will be removed from DOM and discarded when `if`
+   * becomes false and re-created and added back to the DOM when `if`
+   * becomes true.  By default, stamped elements will be hidden but left
+   * in the DOM when `if` becomes false, which is generally results
+   * in better performance.
+   */
+  restamp: boolean|null|undefined;
+
+  /**
+   * When the global `suppressTemplateNotifications` setting is used, setting
+   * `notifyDomChange: true` will enable firing `dom-change` events on this
+   * element.
+   */
+  notifyDomChange: boolean|null|undefined;
+  connectedCallback(): void;
+  disconnectedCallback(): void;
+
+  /**
+   * Forces the element to render its content. Normally rendering is
+   * asynchronous to a provoking change. This is done for efficiency so
+   * that multiple changes trigger only a single render. The render method
+   * should be called if, for example, template rendering is required to
+   * validate application state.
+   */
+  render(): void;
+
+  /**
+   * Abstract API to be implemented by subclass: Returns true if a template
+   * instance has been created and inserted.
+   *
+   * @returns True when an instance has been created.
+   */
+  __hasInstance(): boolean;
+
+  /**
+   * Abstract API to be implemented by subclass: Returns the child nodes stamped
+   * from a template instance.
+   *
+   * @returns Array of child nodes stamped from the template
+   * instance.
+   */
+  __getInstanceNodes(): Array<Node|null>|null;
+
+  /**
+   * Abstract API to be implemented by subclass: Creates an instance of the
+   * template and inserts it into the given parent node.
+   *
+   * @param parentNode The parent node to insert the instance into
+   */
+  __createAndInsertInstance(parentNode: Node|null): void;
+
+  /**
+   * Abstract API to be implemented by subclass: Removes nodes created by an
+   * instance of a template and any associated cleanup.
+   */
+  __teardownInstance(): void;
+
+  /**
+   * Abstract API to be implemented by subclass: Shows or hides any template
+   * instance childNodes based on the `if` state of the element and its
+   * `__hideTemplateChildren__` property.
+   */
+  _showHideChildren(): void;
+}
+
+declare global {
+
+  interface HTMLElementTagNameMap {
+    "dom-if": DomIfBase;
+  }
+}
+
+/**
+ * The version of DomIf used when `fastDomIf` setting is in use, which is
+ * optimized for first-render (but adds a tax to all subsequent property updates
+ * on the host, whether they were used in a given `dom-if` or not).
+ *
+ * This implementation avoids use of `Templatizer`, which introduces a new scope
+ * (a non-element PropertyEffects instance), which is not strictly necessary
+ * since `dom-if` never introduces new properties to its scope (unlike
+ * `dom-repeat`). Taking advantage of this fact, the `dom-if` reaches up to its
+ * `__dataHost` and stamps the template directly from the host using the host's
+ * runtime `_stampTemplate` API, which binds the property effects of the
+ * template directly to the host. This both avoids the intermediary
+ * `Templatizer` instance, but also avoids the need to bind host properties to
+ * the `<template>` element and forward those into the template instance.
+ *
+ * In this version of `dom-if`, the `this.__instance` method is the
+ * `DocumentFragment` returned from `_stampTemplate`, which also serves as the
+ * handle for later removing it using the `_removeBoundDom` method.
+ */
+declare class DomIfFast extends DomIfBase {
+  constructor();
+
+  /**
+   * Implementation of abstract API needed by DomIfBase.
+   *
+   * Shows or hides the template instance top level child nodes. For
+   * text nodes, `textContent` is removed while "hidden" and replaced when
+   * "shown."
+   */
+  _showHideChildren(): void;
+}
+
+/**
+ * The "legacy" implementation of `dom-if`, implemented using `Templatizer`.
+ *
+ * In this version, `this.__instance` is the `TemplateInstance` returned
+ * from the templatized constructor.
+ */
+declare class DomIfLegacy extends DomIfBase {
+  constructor();
+
+  /**
+   * Implementation of abstract API needed by DomIfBase.
+   *
+   * Shows or hides the template instance top level child elements. For
+   * text nodes, `textContent` is removed while "hidden" and replaced when
+   * "shown."
+   */
+  _showHideChildren(): void;
+}
+
+export {DomIf};
+
+/**
+ * The `<dom-if>` element will stamp a light-dom `<template>` child when
+ * the `if` property becomes truthy, and the template can use Polymer
+ * data-binding and declarative event features when used in the context of
+ * a Polymer element's template.
+ *
+ * When `if` becomes falsy, the stamped content is hidden but not
+ * removed from dom. When `if` subsequently becomes truthy again, the content
+ * is simply re-shown. This approach is used due to its favorable performance
+ * characteristics: the expense of creating template content is paid only
+ * once and lazily.
+ *
+ * Set the `restamp` property to true to force the stamped content to be
+ * created / destroyed when the `if` condition changes.
+ */
+declare class DomIf extends DomIfBase {
+}
+
+import {TemplateInfo} from '../../interfaces';
diff --git a/lib/elements/dom-module.d.ts b/lib/elements/dom-module.d.ts
new file mode 100644
index 0000000000..3d9132488c
--- /dev/null
+++ b/lib/elements/dom-module.d.ts
@@ -0,0 +1,77 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+// tslint:disable:no-any describes the API as best we are able today
+
+import {resolveUrl, pathFromUrl} from '../utils/resolve-url.js';
+
+export {DomModule};
+
+/**
+ * The `dom-module` element registers the dom it contains to the name given
+ * by the module's id attribute. It provides a unified database of dom
+ * accessible via its static `import` API.
+ *
+ * A key use case of `dom-module` is for providing custom element `<template>`s
+ * via HTML imports that are parsed by the native HTML parser, that can be
+ * relocated during a bundling pass and still looked up by `id`.
+ *
+ * Example:
+ *
+ *     <dom-module id="foo">
+ *       <img src="stuff.png">
+ *     </dom-module>
+ *
+ * Then in code in some other location that cannot access the dom-module above
+ *
+ *     let img = customElements.get('dom-module').import('foo', 'img');
+ */
+declare class DomModule extends HTMLElement {
+
+  /**
+   * The absolute URL of the original location of this `dom-module`.
+   *
+   * This value will differ from this element's `ownerDocument` in the
+   * following ways:
+   * - Takes into account any `assetpath` attribute added during bundling
+   *   to indicate the original location relative to the bundled location
+   * - Uses the HTMLImports polyfill's `importForElement` API to ensure
+   *   the path is relative to the import document's location since
+   *   `ownerDocument` is not currently polyfilled
+   *    
+   */
+  readonly assetpath: any;
+
+  /**
+   * Retrieves the element specified by the css `selector` in the module
+   * registered by `id`. For example, this.import('foo', 'img');
+   *
+   * @param id The id of the dom-module in which to search.
+   * @param selector The css selector by which to find the element.
+   * @returns Returns the element which matches `selector` in the
+   * module registered at the specified `id`.
+   */
+  static import(id: string, selector?: string): Element|null;
+
+  /**
+   * @param name Name of attribute.
+   * @param old Old value of attribute.
+   * @param value Current value of attribute.
+   * @param namespace Attribute namespace.
+   */
+  attributeChangedCallback(name: string, old: string|null, value: string|null, namespace: string|null): void;
+
+  /**
+   * Registers the dom-module at a given id. This method should only be called
+   * when a dom-module is imperatively created. For
+   * example, `document.createElement('dom-module').register('foo')`.
+   *
+   * @param id The id at which to register the dom-module.
+   */
+  register(id?: string): void;
+}
+
+declare global {
+
+  interface HTMLElementTagNameMap {
+    "dom-module": DomModule;
+  }
+}
diff --git a/lib/elements/dom-repeat.d.ts b/lib/elements/dom-repeat.d.ts
new file mode 100644
index 0000000000..b584d27526
--- /dev/null
+++ b/lib/elements/dom-repeat.d.ts
@@ -0,0 +1,314 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+// tslint:disable:no-any describes the API as best we are able today
+
+import {PolymerElement} from '../../polymer-element.js';
+
+import {TemplateInstanceBase, templatize, modelForElement} from '../utils/templatize.js';
+
+import {Debouncer} from '../utils/debounce.js';
+
+import {enqueueDebouncer, flush} from '../utils/flush.js';
+
+import {OptionalMutableData} from '../mixins/mutable-data.js';
+
+import {matches, translate} from '../utils/path.js';
+
+import {timeOut, microTask} from '../utils/async.js';
+
+import {hideElementsGlobally} from '../utils/hide-template-controls.js';
+
+export {DomRepeat};
+
+/**
+ * The `<dom-repeat>` element will automatically stamp and binds one instance
+ * of template content to each object in a user-provided array.
+ * `dom-repeat` accepts an `items` property, and one instance of the template
+ * is stamped for each item into the DOM at the location of the `dom-repeat`
+ * element.  The `item` property will be set on each instance's binding
+ * scope, thus templates should bind to sub-properties of `item`.
+ *
+ * Example:
+ *
+ * ```html
+ * <dom-module id="employee-list">
+ *
+ *   <template>
+ *
+ *     <div> Employee list: </div>
+ *     <dom-repeat items="{{employees}}">
+ *       <template>
+ *         <div>First name: <span>{{item.first}}</span></div>
+ *         <div>Last name: <span>{{item.last}}</span></div>
+ *       </template>
+ *     </dom-repeat>
+ *
+ *   </template>
+ *
+ * </dom-module>
+ * ```
+ *
+ * With the following custom element definition:
+ *
+ * ```js
+ * class EmployeeList extends PolymerElement {
+ *   static get is() { return 'employee-list'; }
+ *   static get properties() {
+ *     return {
+ *       employees: {
+ *         value() {
+ *           return [
+ *             {first: 'Bob', last: 'Smith'},
+ *             {first: 'Sally', last: 'Johnson'},
+ *             ...
+ *           ];
+ *         }
+ *       }
+ *     };
+ *   }
+ * }
+ * ```
+ *
+ * Notifications for changes to items sub-properties will be forwarded to template
+ * instances, which will update via the normal structured data notification system.
+ *
+ * Mutations to the `items` array itself should be made using the Array
+ * mutation API's on the PropertyEffects mixin (`push`, `pop`, `splice`,
+ * `shift`, `unshift`), and template instances will be kept in sync with the
+ * data in the array.
+ *
+ * Events caught by event handlers within the `dom-repeat` template will be
+ * decorated with a `model` property, which represents the binding scope for
+ * each template instance.  The model should be used to manipulate data on the
+ * instance, for example `event.model.set('item.checked', true);`.
+ *
+ * Alternatively, the model for a template instance for an element stamped by
+ * a `dom-repeat` can be obtained using the `modelForElement` API on the
+ * `dom-repeat` that stamped it, for example
+ * `this.$.domRepeat.modelForElement(event.target).set('item.checked', true);`.
+ * This may be useful for manipulating instance data of event targets obtained
+ * by event handlers on parents of the `dom-repeat` (event delegation).
+ *
+ * A view-specific filter/sort may be applied to each `dom-repeat` by supplying a
+ * `filter` and/or `sort` property.  This may be a string that names a function on
+ * the host, or a function may be assigned to the property directly.  The functions
+ * should implemented following the standard `Array` filter/sort API.
+ *
+ * In order to re-run the filter or sort functions based on changes to sub-fields
+ * of `items`, the `observe` property may be set as a space-separated list of
+ * `item` sub-fields that should cause a re-filter/sort when modified.  If
+ * the filter or sort function depends on properties not contained in `items`,
+ * the user should observe changes to those properties and call `render` to update
+ * the view based on the dependency change.
+ *
+ * For example, for an `dom-repeat` with a filter of the following:
+ *
+ * ```js
+ * isEngineer(item) {
+ *   return item.type == 'engineer' || item.manager.type == 'engineer';
+ * }
+ * ```
+ *
+ * Then the `observe` property should be configured as follows:
+ *
+ * ```html
+ * <dom-repeat items="{{employees}}" filter="isEngineer" observe="type manager.type">
+ * ```
+ */
+declare class DomRepeat extends
+  OptionalMutableData(
+  PolymerElement) {
+  _templateInfo: TemplateInfo|null;
+
+  /**
+   * An array containing items determining how many instances of the template
+   * to stamp and that that each template instance should bind to.
+   */
+  items: any[]|null|undefined;
+
+  /**
+   * The name of the variable to add to the binding scope for the array
+   * element associated with a given template instance.
+   */
+  as: string|null|undefined;
+
+  /**
+   * The name of the variable to add to the binding scope with the index
+   * of the instance in the sorted and filtered list of rendered items.
+   * Note, for the index in the `this.items` array, use the value of the
+   * `itemsIndexAs` property.
+   */
+  indexAs: string|null|undefined;
+
+  /**
+   * The name of the variable to add to the binding scope with the index
+   * of the instance in the `this.items` array. Note, for the index of
+   * this instance in the sorted and filtered list of rendered items,
+   * use the value of the `indexAs` property.
+   */
+  itemsIndexAs: string|null|undefined;
+
+  /**
+   * A function that should determine the sort order of the items.  This
+   * property should either be provided as a string, indicating a method
+   * name on the element's host, or else be an actual function.  The
+   * function should match the sort function passed to `Array.sort`.
+   * Using a sort function has no effect on the underlying `items` array.
+   */
+  sort: Function|null|undefined;
+
+  /**
+   * A function that can be used to filter items out of the view.  This
+   * property should either be provided as a string, indicating a method
+   * name on the element's host, or else be an actual function.  The
+   * function should match the sort function passed to `Array.filter`.
+   * Using a filter function has no effect on the underlying `items` array.
+   */
+  filter: Function|null|undefined;
+
+  /**
+   * When using a `filter` or `sort` function, the `observe` property
+   * should be set to a space-separated list of the names of item
+   * sub-fields that should trigger a re-sort or re-filter when changed.
+   * These should generally be fields of `item` that the sort or filter
+   * function depends on.
+   */
+  observe: string|null|undefined;
+
+  /**
+   * When using a `filter` or `sort` function, the `delay` property
+   * determines a debounce time in ms after a change to observed item
+   * properties that must pass before the filter or sort is re-run.
+   * This is useful in rate-limiting shuffling of the view when
+   * item changes may be frequent.
+   */
+  delay: number|null|undefined;
+
+  /**
+   * Count of currently rendered items after `filter` (if any) has been applied.
+   * If "chunking mode" is enabled, `renderedItemCount` is updated each time a
+   * set of template instances is rendered.
+   */
+  readonly renderedItemCount: number|null|undefined;
+
+  /**
+   * When greater than zero, defines an initial count of template instances
+   * to render after setting the `items` array, before the next paint, and
+   * puts the `dom-repeat` into "chunking mode".  The remaining items (and
+   * any future items as a result of pushing onto the array) will be created
+   * and rendered incrementally at each animation frame thereof until all
+   * instances have been rendered.
+   */
+  initialCount: number|null|undefined;
+
+  /**
+   * When `initialCount` is used, this property defines a frame rate (in
+   * fps) to target by throttling the number of instances rendered each
+   * frame to not exceed the budget for the target frame rate.  The
+   * framerate is effectively the number of `requestAnimationFrame`s that
+   * it tries to allow to actually fire in a given second. It does this
+   * by measuring the time between `rAF`s and continuously adjusting the
+   * number of items created each `rAF` to maintain the target framerate.
+   * Setting this to a higher number allows lower latency and higher
+   * throughput for event handlers and other tasks, but results in a
+   * longer time for the remaining items to complete rendering.
+   */
+  targetFramerate: number|null|undefined;
+  readonly _targetFrameTime: number|null|undefined;
+
+  /**
+   * When the global `suppressTemplateNotifications` setting is used, setting
+   * `notifyDomChange: true` will enable firing `dom-change` events on this
+   * element.
+   */
+  notifyDomChange: boolean|null|undefined;
+
+  /**
+   * When chunking is enabled via `initialCount` and the `items` array is
+   * set to a new array, this flag controls whether the previously rendered
+   * instances are reused or not.
+   *
+   * When `true`, any previously rendered template instances are updated in
+   * place to their new item values synchronously in one shot, and then any
+   * further items (if any) are chunked out.  When `false`, the list is
+   * returned back to its `initialCount` (any instances over the initial
+   * count are discarded) and the remainder of the list is chunked back in.
+   * Set this to `true` to avoid re-creating the list and losing scroll
+   * position, although note that when changing the list to completely
+   * different data the render thread will be blocked until all existing
+   * instances are updated to their new data.
+   */
+  reuseChunkedInstances: boolean|null|undefined;
+  connectedCallback(): void;
+  disconnectedCallback(): void;
+
+  /**
+   * Forces the element to render its content. Normally rendering is
+   * asynchronous to a provoking change. This is done for efficiency so
+   * that multiple changes trigger only a single render. The render method
+   * should be called if, for example, template rendering is required to
+   * validate application state.
+   */
+  render(): void;
+
+  /**
+   * Shows or hides the template instance top level child elements. For
+   * text nodes, `textContent` is removed while "hidden" and replaced when
+   * "shown."
+   *
+   * @param hidden Set to true to hide the children;
+   * set to false to show them.
+   */
+  _showHideChildren(hidden: boolean): void;
+
+  /**
+   * Returns the item associated with a given element stamped by
+   * this `dom-repeat`.
+   *
+   * Note, to modify sub-properties of the item,
+   * `modelForElement(el).set('item.<sub-prop>', value)`
+   * should be used.
+   *
+   * @param el Element for which to return the item.
+   * @returns Item associated with the element.
+   */
+  itemForElement(el: HTMLElement): any;
+
+  /**
+   * Returns the inst index for a given element stamped by this `dom-repeat`.
+   * If `sort` is provided, the index will reflect the sorted order (rather
+   * than the original array order).
+   *
+   * @param el Element for which to return the index.
+   * @returns Row index associated with the element (note this may
+   *   not correspond to the array index if a user `sort` is applied).
+   */
+  indexForElement(el: HTMLElement): number|null;
+
+  /**
+   * Returns the template "model" associated with a given element, which
+   * serves as the binding scope for the template instance the element is
+   * contained in. A template model
+   * should be used to manipulate data associated with this template instance.
+   *
+   * Example:
+   *
+   *   let model = modelForElement(el);
+   *   if (model.index < 10) {
+   *     model.set('item.checked', true);
+   *   }
+   *
+   * @param el Element for which to return a template model.
+   * @returns Model representing the binding scope for
+   *   the element.
+   */
+  modelForElement(el: HTMLElement): TemplateInstanceBase|null;
+}
+
+declare global {
+
+  interface HTMLElementTagNameMap {
+    "dom-repeat": DomRepeat;
+  }
+}
+
+import {TemplateInfo} from '../../interfaces';
diff --git a/lib/legacy/class.d.ts b/lib/legacy/class.d.ts
new file mode 100644
index 0000000000..3d45b53cf1
--- /dev/null
+++ b/lib/legacy/class.d.ts
@@ -0,0 +1,91 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+// tslint:disable:no-any describes the API as best we are able today
+
+import {LegacyElementMixin} from './legacy-element-mixin.js';
+
+export {mixinBehaviors};
+
+
+/**
+ * Applies a "legacy" behavior or array of behaviors to the provided class.
+ *
+ * Note: this method will automatically also apply the `LegacyElementMixin`
+ * to ensure that any legacy behaviors can rely on legacy Polymer API on
+ * the underlying element.
+ *
+ * @returns Returns a new Element class extended by the
+ * passed in `behaviors` and also by `LegacyElementMixin`.
+ */
+declare function mixinBehaviors<T>(behaviors: object|object[], klass: {new(): T}): any;
+
+export {Class};
+
+
+/**
+ * Generates a class that extends `LegacyElement` based on the
+ * provided info object.  Metadata objects on the `info` object
+ * (`properties`, `observers`, `listeners`, `behaviors`, `is`) are used
+ * for Polymer's meta-programming systems, and any functions are copied
+ * to the generated class.
+ *
+ * Valid "metadata" values are as follows:
+ *
+ * `is`: String providing the tag name to register the element under. In
+ * addition, if a `dom-module` with the same id exists, the first template
+ * in that `dom-module` will be stamped into the shadow root of this element,
+ * with support for declarative event listeners (`on-...`), Polymer data
+ * bindings (`[[...]]` and `{{...}}`), and id-based node finding into
+ * `this.$`.
+ *
+ * `properties`: Object describing property-related metadata used by Polymer
+ * features (key: property names, value: object containing property metadata).
+ * Valid keys in per-property metadata include:
+ * - `type` (String|Number|Object|Array|...): Used by
+ *   `attributeChangedCallback` to determine how string-based attributes
+ *   are deserialized to JavaScript property values.
+ * - `notify` (boolean): Causes a change in the property to fire a
+ *   non-bubbling event called `<property>-changed`. Elements that have
+ *   enabled two-way binding to the property use this event to observe changes.
+ * - `readOnly` (boolean): Creates a getter for the property, but no setter.
+ *   To set a read-only property, use the private setter method
+ *   `_setProperty(property, value)`.
+ * - `observer` (string): Observer method name that will be called when
+ *   the property changes. The arguments of the method are
+ *   `(value, previousValue)`.
+ * - `computed` (string): String describing method and dependent properties
+ *   for computing the value of this property (e.g. `'computeFoo(bar, zot)'`).
+ *   Computed properties are read-only by default and can only be changed
+ *   via the return value of the computing method.
+ *
+ * `observers`: Array of strings describing multi-property observer methods
+ *  and their dependent properties (e.g. `'observeABC(a, b, c)'`).
+ *
+ * `listeners`: Object describing event listeners to be added to each
+ *  instance of this element (key: event name, value: method name).
+ *
+ * `behaviors`: Array of additional `info` objects containing metadata
+ * and callbacks in the same format as the `info` object here which are
+ * merged into this element.
+ *
+ * `hostAttributes`: Object listing attributes to be applied to the host
+ *  once created (key: attribute name, value: attribute value).  Values
+ *  are serialized based on the type of the value.  Host attributes should
+ *  generally be limited to attributes such as `tabIndex` and `aria-...`.
+ *  Attributes in `hostAttributes` are only applied if a user-supplied
+ *  attribute is not already present (attributes in markup override
+ *  `hostAttributes`).
+ *
+ * In addition, the following Polymer-specific callbacks may be provided:
+ * - `registered`: called after first instance of this element,
+ * - `created`: called during `constructor`
+ * - `attached`: called during `connectedCallback`
+ * - `detached`: called during `disconnectedCallback`
+ * - `ready`: called before first `attached`, after all properties of
+ *   this element have been propagated to its template and all observers
+ *   have run
+ *
+ * @returns Generated class
+ */
+declare function Class<T>(info: PolymerInit, mixin: (p0: T) => T): {new(): HTMLElement};
+
+import {PolymerInit} from '../../interfaces';
diff --git a/lib/legacy/legacy-data-mixin.d.ts b/lib/legacy/legacy-data-mixin.d.ts
new file mode 100644
index 0000000000..6673c1acc6
--- /dev/null
+++ b/lib/legacy/legacy-data-mixin.d.ts
@@ -0,0 +1,56 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+// tslint:disable:no-any describes the API as best we are able today
+
+import {Class} from './class.js';
+
+import {Polymer} from '../../polymer-legacy.js';
+
+import {dedupingMixin} from '../utils/mixin.js';
+
+import {templatize} from '../utils/templatize.js';
+
+declare class UndefinedArgumentError extends Error {
+  constructor(message: any, arg: any);
+}
+
+export {LegacyDataMixin};
+
+
+/**
+ * Mixin to selectively add back Polymer 1.x's `undefined` rules
+ * governing when observers & computing functions run based
+ * on all arguments being defined (reference https://www.polymer-project.org/1.0/docs/devguide/observers#multi-property-observers).
+ *
+ * When loaded, all legacy elements (defined with `Polymer({...})`)
+ * will have the mixin applied. The mixin only restores legacy data handling
+ * if `_legacyUndefinedCheck: true` is set on the element's prototype.
+ *
+ * This mixin is intended for use to help migration from Polymer 1.x to
+ * 2.x+ by allowing legacy code to work while identifying observers and
+ * computing functions that need undefined checks to work without
+ * the mixin in Polymer 2.
+ */
+declare function LegacyDataMixin<T extends new (...args: any[]) => {}>(base: T): T & LegacyDataMixinConstructor;
+
+interface LegacyDataMixinConstructor {
+  new(...args: any[]): LegacyDataMixin;
+}
+
+export {LegacyDataMixinConstructor};
+
+interface LegacyDataMixin {
+}
+
+declare function TemplatizeMixin<T extends new (...args: any[]) => {}>(base: T): T & TemplatizeMixinConstructor;
+
+interface TemplatizeMixinConstructor {
+  new(...args: any[]): TemplatizeMixin;
+}
+
+export {TemplatizeMixinConstructor};
+
+interface TemplatizeMixin {
+}
+
+declare class legacyBase extends HTMLElement {
+}
diff --git a/lib/legacy/legacy-element-mixin.d.ts b/lib/legacy/legacy-element-mixin.d.ts
new file mode 100644
index 0000000000..93a70881be
--- /dev/null
+++ b/lib/legacy/legacy-element-mixin.d.ts
@@ -0,0 +1,664 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+// tslint:disable:no-any describes the API as best we are able today
+
+import {ElementMixin} from '../mixins/element-mixin.js';
+
+import {GestureEventListeners} from '../mixins/gesture-event-listeners.js';
+
+import {DirMixin} from '../mixins/dir-mixin.js';
+
+import {dedupingMixin} from '../utils/mixin.js';
+
+import {dom, matchesSelector} from './polymer.dom.js';
+
+import {setTouchAction} from '../utils/gestures.js';
+
+import {Debouncer} from '../utils/debounce.js';
+
+import {timeOut, microTask} from '../utils/async.js';
+
+import {get} from '../utils/path.js';
+
+import {scopeSubtree} from '../utils/scope-subtree.js';
+
+import {findObservedAttributesGetter} from '../mixins/disable-upgrade-mixin.js';
+
+import {register} from '../utils/telemetry.js';
+
+export {LegacyElementMixin};
+
+
+/**
+ * Element class mixin that provides Polymer's "legacy" API intended to be
+ * backward-compatible to the greatest extent possible with the API
+ * found on the Polymer 1.x `Polymer.Base` prototype applied to all elements
+ * defined using the `Polymer({...})` function.
+ */
+declare function LegacyElementMixin<T extends new (...args: any[]) => {}>(base: T): T & LegacyElementMixinConstructor & ElementMixinConstructor & PropertyEffectsConstructor & TemplateStampConstructor & PropertyAccessorsConstructor & PropertiesChangedConstructor & PropertiesMixinConstructor & GestureEventListenersConstructor & DirMixinConstructor;
+
+import {ElementMixinConstructor} from '../mixins/element-mixin.js';
+
+import {PropertyEffectsConstructor, PropertyEffects} from '../mixins/property-effects.js';
+
+import {TemplateStampConstructor, TemplateStamp} from '../mixins/template-stamp.js';
+
+import {PropertyAccessorsConstructor, PropertyAccessors} from '../mixins/property-accessors.js';
+
+import {PropertiesChangedConstructor, PropertiesChanged} from '../mixins/properties-changed.js';
+
+import {PropertiesMixinConstructor, PropertiesMixin} from '../mixins/properties-mixin.js';
+
+import {GestureEventListenersConstructor} from '../mixins/gesture-event-listeners.js';
+
+import {DirMixinConstructor} from '../mixins/dir-mixin.js';
+
+interface LegacyElementMixinConstructor {
+  new(...args: any[]): LegacyElementMixin;
+}
+
+export {LegacyElementMixinConstructor};
+
+interface LegacyElementMixin extends ElementMixin, PropertyEffects, TemplateStamp, PropertyAccessors, PropertiesChanged, PropertiesMixin, GestureEventListeners, DirMixin {
+  isAttached: boolean;
+  _debouncers: {[key: string]: Function|null}|null;
+  _legacyForceObservedAttributes: boolean|undefined;
+
+  /**
+   * Return the element whose local dom within which this element
+   * is contained. This is a shorthand for
+   * `this.getRootNode().host`.
+   */
+  readonly domHost: Node|null;
+  is: string;
+
+  /**
+   * Overrides the default `Polymer.PropertyEffects` implementation to
+   * add support for installing `hostAttributes` and `listeners`.
+   */
+  ready(): void;
+
+  /**
+   * Overrides the default `Polymer.PropertyEffects` implementation to
+   * add support for class initialization via the `_registered` callback.
+   * This is called only when the first instance of the element is created.
+   */
+  _initializeProperties(): void;
+  _enableProperties(): void;
+
+  /**
+   * Provides an override implementation of `attributeChangedCallback`
+   * which adds the Polymer legacy API's `attributeChanged` method.
+   *
+   * @param name Name of attribute.
+   * @param old Old value of attribute.
+   * @param value Current value of attribute.
+   * @param namespace Attribute namespace.
+   */
+  attributeChangedCallback(name: string, old: string|null, value: string|null, namespace: string|null): void;
+
+  /**
+   * Provides an implementation of `connectedCallback`
+   * which adds Polymer legacy API's `attached` method.
+   */
+  connectedCallback(): void;
+
+  /**
+   * Provides an implementation of `disconnectedCallback`
+   * which adds Polymer legacy API's `detached` method.
+   */
+  disconnectedCallback(): void;
+  _canApplyPropertyDefault(property: any): any;
+
+  /**
+   * Legacy callback called during the `constructor`, for overriding
+   * by the user.
+   */
+  created(): void;
+
+  /**
+   * Sets the value of an attribute.
+   * @param name The name of the attribute to change.
+   * @param value The new attribute value.
+   */
+  setAttribute(name: string, value: string): void;
+
+  /**
+   * Removes an attribute.
+   *
+   * @param name The name of the attribute to remove.
+   */
+  removeAttribute(name: string): void;
+
+  /**
+   * Legacy callback called during `connectedCallback`, for overriding
+   * by the user.
+   */
+  attached(): void;
+
+  /**
+   * Legacy callback called during `disconnectedCallback`, for overriding
+   * by the user.
+   */
+  detached(): void;
+
+  /**
+   * Legacy callback called during `attributeChangedChallback`, for overriding
+   * by the user.
+   *
+   * @param name Name of attribute.
+   * @param old Old value of attribute.
+   * @param value Current value of attribute.
+   */
+  attributeChanged(name: string, old: string|null, value: string|null): void;
+  _takeAttributes(): void;
+
+  /**
+   * Called automatically when an element is initializing.
+   * Users may override this method to perform class registration time
+   * work. The implementation should ensure the work is performed
+   * only once for the class.
+   */
+  _registered(): void;
+
+  /**
+   * Ensures an element has required attributes. Called when the element
+   * is being readied via `ready`. Users should override to set the
+   * element's required attributes. The implementation should be sure
+   * to check and not override existing attributes added by
+   * the user of the element. Typically, setting attributes should be left
+   * to the element user and not done here; reasonable exceptions include
+   * setting aria roles and focusability.
+   */
+  _ensureAttributes(): void;
+
+  /**
+   * Adds element event listeners. Called when the element
+   * is being readied via `ready`. Users should override to
+   * add any required element event listeners.
+   * In performance critical elements, the work done here should be kept
+   * to a minimum since it is done before the element is rendered. In
+   * these elements, consider adding listeners asynchronously so as not to
+   * block render.
+   */
+  _applyListeners(): void;
+
+  /**
+   * Converts a typed JavaScript value to a string.
+   *
+   * Note this method is provided as backward-compatible legacy API
+   * only.  It is not directly called by any Polymer features. To customize
+   * how properties are serialized to attributes for attribute bindings and
+   * `reflectToAttribute: true` properties as well as this method, override
+   * the `_serializeValue` method provided by `Polymer.PropertyAccessors`.
+   *
+   * @param value Value to deserialize
+   * @returns Serialized value
+   */
+  serialize(value: any): string|undefined;
+
+  /**
+   * Converts a string to a typed JavaScript value.
+   *
+   * Note this method is provided as backward-compatible legacy API
+   * only.  It is not directly called by any Polymer features.  To customize
+   * how attributes are deserialized to properties for in
+   * `attributeChangedCallback`, override `_deserializeValue` method
+   * provided by `Polymer.PropertyAccessors`.
+   *
+   * @param value String to deserialize
+   * @param type Type to deserialize the string to
+   * @returns Returns the deserialized value in the `type` given.
+   */
+  deserialize(value: string, type: any): any;
+
+  /**
+   * Serializes a property to its associated attribute.
+   *
+   * Note this method is provided as backward-compatible legacy API
+   * only.  It is not directly called by any Polymer features.
+   *
+   * @param property Property name to reflect.
+   * @param attribute Attribute name to reflect.
+   * @param value Property value to reflect.
+   */
+  reflectPropertyToAttribute(property: string, attribute?: string, value?: any): void;
+
+  /**
+   * Sets a typed value to an HTML attribute on a node.
+   *
+   * Note this method is provided as backward-compatible legacy API
+   * only.  It is not directly called by any Polymer features.
+   *
+   * @param value Value to serialize.
+   * @param attribute Attribute name to serialize to.
+   * @param node Element to set attribute to.
+   */
+  serializeValueToAttribute(value: any, attribute: string, node: Element|null): void;
+
+  /**
+   * Copies own properties (including accessor descriptors) from a source
+   * object to a target object.
+   *
+   * @param prototype Target object to copy properties to.
+   * @param api Source object to copy properties from.
+   * @returns prototype object that was passed as first argument.
+   */
+  extend(prototype: object|null, api: object|null): object|null;
+
+  /**
+   * Copies props from a source object to a target object.
+   *
+   * Note, this method uses a simple `for...in` strategy for enumerating
+   * properties.  To ensure only `ownProperties` are copied from source
+   * to target and that accessor implementations are copied, use `extend`.
+   *
+   * @param target Target object to copy properties to.
+   * @param source Source object to copy properties from.
+   * @returns Target object that was passed as first argument.
+   */
+  mixin(target: object, source: object): object;
+
+  /**
+   * Sets the prototype of an object.
+   *
+   * Note this method is provided as backward-compatible legacy API
+   * only.  It is not directly called by any Polymer features.
+   *
+   * @param object The object on which to set the prototype.
+   * @param prototype The prototype that will be set on the given
+   * `object`.
+   * @returns Returns the given `object` with its prototype set
+   * to the given `prototype` object.
+   */
+  chainObject(object: object|null, prototype: object|null): object|null;
+
+  /**
+   * Calls `importNode` on the `content` of the `template` specified and
+   * returns a document fragment containing the imported content.
+   *
+   * @param template HTML template element to instance.
+   * @returns Document fragment containing the imported
+   *   template content.
+   */
+  instanceTemplate(template: HTMLTemplateElement|null): DocumentFragment;
+
+  /**
+   * Dispatches a custom event with an optional detail value.
+   *
+   * @param type Name of event type.
+   * @param detail Detail value containing event-specific
+   *   payload.
+   * @param options Object specifying options.  These may include:
+   *  `bubbles` (boolean, defaults to `true`),
+   *  `cancelable` (boolean, defaults to false), and
+   *  `node` on which to fire the event (HTMLElement, defaults to `this`).
+   * @returns The new event that was fired.
+   */
+  fire(type: string, detail?: any, options?: {bubbles?: boolean, cancelable?: boolean, composed?: boolean}): Event;
+
+  /**
+   * Convenience method to add an event listener on a given element,
+   * late bound to a named method on this element.
+   *
+   * @param node Element to add event listener to.
+   * @param eventName Name of event to listen for.
+   * @param methodName Name of handler method on `this` to call.
+   */
+  listen(node: EventTarget|null, eventName: string, methodName: string): void;
+
+  /**
+   * Convenience method to remove an event listener from a given element,
+   * late bound to a named method on this element.
+   *
+   * @param node Element to remove event listener from.
+   * @param eventName Name of event to stop listening to.
+   * @param methodName Name of handler method on `this` to not call
+   *      anymore.
+   */
+  unlisten(node: EventTarget|null, eventName: string, methodName: string): void;
+
+  /**
+   * Override scrolling behavior to all direction, one direction, or none.
+   *
+   * Valid scroll directions:
+   *   - 'all': scroll in any direction
+   *   - 'x': scroll only in the 'x' direction
+   *   - 'y': scroll only in the 'y' direction
+   *   - 'none': disable scrolling for this node
+   *
+   * @param direction Direction to allow scrolling
+   * Defaults to `all`.
+   * @param node Element to apply scroll direction setting.
+   * Defaults to `this`.
+   */
+  setScrollDirection(direction?: string, node?: Element|null): void;
+
+  /**
+   * Convenience method to run `querySelector` on this local DOM scope.
+   *
+   * This function calls `Polymer.dom(this.root).querySelector(slctr)`.
+   *
+   * @param slctr Selector to run on this local DOM scope
+   * @returns Element found by the selector, or null if not found.
+   */
+  $$(slctr: string): Element|null;
+
+  /**
+   * Force this element to distribute its children to its local dom.
+   * This should not be necessary as of Polymer 2.0.2 and is provided only
+   * for backwards compatibility.
+   */
+  distributeContent(): void;
+
+  /**
+   * Returns a list of nodes that are the effective childNodes. The effective
+   * childNodes list is the same as the element's childNodes except that
+   * any `<content>` elements are replaced with the list of nodes distributed
+   * to the `<content>`, the result of its `getDistributedNodes` method.
+   *
+   * @returns List of effective child nodes.
+   */
+  getEffectiveChildNodes(): Node[];
+
+  /**
+   * Returns a list of nodes distributed within this element that match
+   * `selector`. These can be dom children or elements distributed to
+   * children that are insertion points.
+   *
+   * @param selector Selector to run.
+   * @returns List of distributed elements that match selector.
+   */
+  queryDistributedElements(selector: string): Node[];
+
+  /**
+   * Returns a list of elements that are the effective children. The effective
+   * children list is the same as the element's children except that
+   * any `<content>` elements are replaced with the list of elements
+   * distributed to the `<content>`.
+   *
+   * @returns List of effective children.
+   */
+  getEffectiveChildren(): Node[];
+
+  /**
+   * Returns a string of text content that is the concatenation of the
+   * text content's of the element's effective childNodes (the elements
+   * returned by <a href="#getEffectiveChildNodes>getEffectiveChildNodes</a>.
+   *
+   * @returns List of effective children.
+   */
+  getEffectiveTextContent(): string;
+
+  /**
+   * Returns the first effective childNode within this element that
+   * match `selector`. These can be dom child nodes or elements distributed
+   * to children that are insertion points.
+   *
+   * @param selector Selector to run.
+   * @returns First effective child node that matches selector.
+   */
+  queryEffectiveChildren(selector: string): Node|null;
+
+  /**
+   * Returns a list of effective childNodes within this element that
+   * match `selector`. These can be dom child nodes or elements distributed
+   * to children that are insertion points.
+   *
+   * @param selector Selector to run.
+   * @returns List of effective child nodes that match
+   *     selector.
+   */
+  queryAllEffectiveChildren(selector: string): Node[];
+
+  /**
+   * Returns a list of nodes distributed to this element's `<slot>`.
+   *
+   * If this element contains more than one `<slot>` in its local DOM,
+   * an optional selector may be passed to choose the desired content.
+   *
+   * @param slctr CSS selector to choose the desired
+   *   `<slot>`.  Defaults to `content`.
+   * @returns List of distributed nodes for the `<slot>`.
+   */
+  getContentChildNodes(slctr?: string): Node[];
+
+  /**
+   * Returns a list of element children distributed to this element's
+   * `<slot>`.
+   *
+   * If this element contains more than one `<slot>` in its
+   * local DOM, an optional selector may be passed to choose the desired
+   * content.  This method differs from `getContentChildNodes` in that only
+   * elements are returned.
+   *
+   * @param slctr CSS selector to choose the desired
+   *   `<content>`.  Defaults to `content`.
+   * @returns List of distributed nodes for the
+   *   `<slot>`.
+   */
+  getContentChildren(slctr?: string): HTMLElement[];
+
+  /**
+   * Checks whether an element is in this element's light DOM tree.
+   *
+   * @param node The element to be checked.
+   * @returns true if node is in this element's light DOM tree.
+   */
+  isLightDescendant(node: Node|null): boolean;
+
+  /**
+   * Checks whether an element is in this element's local DOM tree.
+   *
+   * @param node The element to be checked.
+   * @returns true if node is in this element's local DOM tree.
+   */
+  isLocalDescendant(node: Element): boolean;
+
+  /**
+   * No-op for backwards compatibility. This should now be handled by
+   * ShadyCss library.
+   *
+   * @param container Container element to scope
+   * @param shouldObserve if true, start a mutation observer for added nodes to the container
+   * @returns Returns a new MutationObserver on `container` if `shouldObserve` is true.
+   */
+  scopeSubtree(container: Element, shouldObserve?: boolean): MutationObserver|null;
+
+  /**
+   * Returns the computed style value for the given property.
+   *
+   * @param property The css property name.
+   * @returns Returns the computed css property value for the given
+   * `property`.
+   */
+  getComputedStyleValue(property: string): string;
+
+  /**
+   * Call `debounce` to collapse multiple requests for a named task into
+   * one invocation which is made after the wait time has elapsed with
+   * no new request.  If no wait time is given, the callback will be called
+   * at microtask timing (guaranteed before paint).
+   *
+   *     debouncedClickAction(e) {
+   *       // will not call `processClick` more than once per 100ms
+   *       this.debounce('click', function() {
+   *        this.processClick();
+   *       } 100);
+   *     }
+   *
+   * @param jobName String to identify the debounce job.
+   * @param callback Function that is called (with `this`
+   *   context) when the wait time elapses.
+   * @param wait Optional wait time in milliseconds (ms) after the
+   *   last signal that must elapse before invoking `callback`
+   * @returns Returns a debouncer object on which exists the
+   * following methods: `isActive()` returns true if the debouncer is
+   * active; `cancel()` cancels the debouncer if it is active;
+   * `flush()` immediately invokes the debounced callback if the debouncer
+   * is active.
+   */
+  debounce(jobName: string, callback: () => void, wait?: number): object;
+
+  /**
+   * Returns whether a named debouncer is active.
+   *
+   * @param jobName The name of the debouncer started with `debounce`
+   * @returns Whether the debouncer is active (has not yet fired).
+   */
+  isDebouncerActive(jobName: string): boolean;
+
+  /**
+   * Immediately calls the debouncer `callback` and inactivates it.
+   *
+   * @param jobName The name of the debouncer started with `debounce`
+   */
+  flushDebouncer(jobName: string): void;
+
+  /**
+   * Cancels an active debouncer.  The `callback` will not be called.
+   *
+   * @param jobName The name of the debouncer started with `debounce`
+   */
+  cancelDebouncer(jobName: string): void;
+
+  /**
+   * Runs a callback function asynchronously.
+   *
+   * By default (if no waitTime is specified), async callbacks are run at
+   * microtask timing, which will occur before paint.
+   *
+   * @param callback The callback function to run, bound to
+   *     `this`.
+   * @param waitTime Time to wait before calling the
+   *   `callback`.  If unspecified or 0, the callback will be run at microtask
+   *   timing (before paint).
+   * @returns Handle that may be used to cancel the async job.
+   */
+  async(callback: Function, waitTime?: number): number;
+
+  /**
+   * Cancels an async operation started with `async`.
+   *
+   * @param handle Handle returned from original `async` call to
+   *   cancel.
+   */
+  cancelAsync(handle: number): void;
+
+  /**
+   * Convenience method for creating an element and configuring it.
+   *
+   * @param tag HTML element tag to create.
+   * @param props Object of properties to configure on the
+   *    instance.
+   * @returns Newly created and configured element.
+   */
+  create(tag: string, props?: object|null): Element;
+
+  /**
+   * Polyfill for Element.prototype.matches, which is sometimes still
+   * prefixed.
+   *
+   * @param selector Selector to test.
+   * @param node Element to test the selector against.
+   * @returns Whether the element matches the selector.
+   */
+  elementMatches(selector: string, node?: Element): boolean;
+
+  /**
+   * Toggles an HTML attribute on or off.
+   *
+   * @param name HTML attribute name
+   * @param bool Boolean to force the attribute on or off.
+   *    When unspecified, the state of the attribute will be reversed.
+   * @returns true if the attribute now exists
+   */
+  toggleAttribute(name: string, bool?: boolean): boolean;
+
+  /**
+   * Toggles a CSS class on or off.
+   *
+   * @param name CSS class name
+   * @param bool Boolean to force the class on or off.
+   *    When unspecified, the state of the class will be reversed.
+   * @param node Node to target.  Defaults to `this`.
+   */
+  toggleClass(name: string, bool?: boolean, node?: Element|null): void;
+
+  /**
+   * Cross-platform helper for setting an element's CSS `transform` property.
+   *
+   * @param transformText Transform setting.
+   * @param node Element to apply the transform to.
+   * Defaults to `this`
+   */
+  transform(transformText: string, node?: Element|null): void;
+
+  /**
+   * Cross-platform helper for setting an element's CSS `translate3d`
+   * property.
+   *
+   * @param x X offset.
+   * @param y Y offset.
+   * @param z Z offset.
+   * @param node Element to apply the transform to.
+   * Defaults to `this`.
+   */
+  translate3d(x: number|string, y: number|string, z: number|string, node?: Element|null): void;
+
+  /**
+   * Removes an item from an array, if it exists.
+   *
+   * If the array is specified by path, a change notification is
+   * generated, so that observers, data bindings and computed
+   * properties watching that path can update.
+   *
+   * If the array is passed directly, **no change
+   * notification is generated**.
+   *
+   * @param arrayOrPath Path to array from
+   *     which to remove the item
+   *   (or the array itself).
+   * @param item Item to remove.
+   * @returns Array containing item removed.
+   */
+  arrayDelete(arrayOrPath: string|Array<number|string>, item: any): any[]|null;
+
+  /**
+   * Facades `console.log`/`warn`/`error` as override point.
+   *
+   * @param level One of 'log', 'warn', 'error'
+   * @param args Array of strings or objects to log
+   */
+  _logger(level: string, args: any[]|null): void;
+
+  /**
+   * Facades `console.log` as an override point.
+   *
+   * @param args Array of strings or objects to log
+   */
+  _log(...args: any[]): void;
+
+  /**
+   * Facades `console.warn` as an override point.
+   *
+   * @param args Array of strings or objects to log
+   */
+  _warn(...args: any[]): void;
+
+  /**
+   * Facades `console.error` as an override point.
+   *
+   * @param args Array of strings or objects to log
+   */
+  _error(...args: any[]): void;
+
+  /**
+   * Formats a message using the element type an a method name.
+   *
+   * @param methodName Method name to associate with message
+   * @param args Array of strings or objects to log
+   * @returns Array with formatting information for `console`
+   *   logging.
+   */
+  _logf(methodName: string, ...args: any[]): any[];
+}
diff --git a/lib/legacy/legacy-element-mixin.js b/lib/legacy/legacy-element-mixin.js
index c443ca7ef8..efbbcc92e0 100644
--- a/lib/legacy/legacy-element-mixin.js
+++ b/lib/legacy/legacy-element-mixin.js
@@ -145,12 +145,6 @@ export const LegacyElementMixin = dedupingMixin((base) => {
 
     /**
      * Sets the value of an attribute.
-     *
-     * NOTE: This function is explicitly excluded when running
-     * gen-typescript-declarations because the function it overrides has
-     * different signatures in Closure and TypeScript's built-in types. This
-     * function's signature should match the signature from Closure:
-     * https://github.com/google/closure-compiler/blob/8972fd4e9b0689e7ebdeea53580521c819f6aecc/externs/browser/w3c_dom1.js#L686-L694
      * @override
      * @param {string} name The name of the attribute to change.
      * @param {string|number|boolean|!TrustedHTML|!TrustedScriptURL|!TrustedURL} value The new attribute value.
diff --git a/lib/legacy/mutable-data-behavior.d.ts b/lib/legacy/mutable-data-behavior.d.ts
new file mode 100644
index 0000000000..d06f56fc0a
--- /dev/null
+++ b/lib/legacy/mutable-data-behavior.d.ts
@@ -0,0 +1,129 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+// tslint:disable:no-any describes the API as best we are able today
+
+import {MutableData} from '../mixins/mutable-data.js';
+
+export {MutableDataBehavior};
+
+/**
+ * Legacy element behavior to skip strict dirty-checking for objects and arrays,
+ * (always consider them to be "dirty") for use on legacy API Polymer elements.
+ *
+ * By default, `Polymer.PropertyEffects` performs strict dirty checking on
+ * objects, which means that any deep modifications to an object or array will
+ * not be propagated unless "immutable" data patterns are used (i.e. all object
+ * references from the root to the mutation were changed).
+ *
+ * Polymer also provides a proprietary data mutation and path notification API
+ * (e.g. `notifyPath`, `set`, and array mutation API's) that allow efficient
+ * mutation and notification of deep changes in an object graph to all elements
+ * bound to the same object graph.
+ *
+ * In cases where neither immutable patterns nor the data mutation API can be
+ * used, applying this mixin will cause Polymer to skip dirty checking for
+ * objects and arrays (always consider them to be "dirty").  This allows a
+ * user to make a deep modification to a bound object graph, and then either
+ * simply re-set the object (e.g. `this.items = this.items`) or call `notifyPath`
+ * (e.g. `this.notifyPath('items')`) to update the tree.  Note that all
+ * elements that wish to be updated based on deep mutations must apply this
+ * mixin or otherwise skip strict dirty checking for objects/arrays.
+ * Specifically, any elements in the binding tree between the source of a
+ * mutation and the consumption of it must apply this behavior or enable the
+ * `Polymer.OptionalMutableDataBehavior`.
+ *
+ * In order to make the dirty check strategy configurable, see
+ * `Polymer.OptionalMutableDataBehavior`.
+ *
+ * Note, the performance characteristics of propagating large object graphs
+ * will be worse as opposed to using strict dirty checking with immutable
+ * patterns or Polymer's path notification API.
+ */
+interface MutableDataBehavior {
+
+  /**
+   * Overrides `Polymer.PropertyEffects` to provide option for skipping
+   * strict equality checking for Objects and Arrays.
+   *
+   * This method pulls the value to dirty check against from the `__dataTemp`
+   * cache (rather than the normal `__data` cache) for Objects.  Since the temp
+   * cache is cleared at the end of a turn, this implementation allows
+   * side-effects of deep object changes to be processed by re-setting the
+   * same object (using the temp cache as an in-turn backstop to prevent
+   * cycles due to 2-way notification).
+   *
+   * @param property Property name
+   * @param value New property value
+   * @param old Previous property value
+   * @returns Whether the property should be considered a change
+   */
+  _shouldPropertyChange(property: string, value: any, old: any): boolean;
+}
+
+declare const MutableDataBehavior: object;
+
+export {OptionalMutableDataBehavior};
+
+/**
+ * Legacy element behavior to add the optional ability to skip strict
+ * dirty-checking for objects and arrays (always consider them to be
+ * "dirty") by setting a `mutable-data` attribute on an element instance.
+ *
+ * By default, `Polymer.PropertyEffects` performs strict dirty checking on
+ * objects, which means that any deep modifications to an object or array will
+ * not be propagated unless "immutable" data patterns are used (i.e. all object
+ * references from the root to the mutation were changed).
+ *
+ * Polymer also provides a proprietary data mutation and path notification API
+ * (e.g. `notifyPath`, `set`, and array mutation API's) that allow efficient
+ * mutation and notification of deep changes in an object graph to all elements
+ * bound to the same object graph.
+ *
+ * In cases where neither immutable patterns nor the data mutation API can be
+ * used, applying this mixin will allow Polymer to skip dirty checking for
+ * objects and arrays (always consider them to be "dirty").  This allows a
+ * user to make a deep modification to a bound object graph, and then either
+ * simply re-set the object (e.g. `this.items = this.items`) or call `notifyPath`
+ * (e.g. `this.notifyPath('items')`) to update the tree.  Note that all
+ * elements that wish to be updated based on deep mutations must apply this
+ * mixin or otherwise skip strict dirty checking for objects/arrays.
+ * Specifically, any elements in the binding tree between the source of a
+ * mutation and the consumption of it must enable this behavior or apply the
+ * `Polymer.OptionalMutableDataBehavior`.
+ *
+ * While this behavior adds the ability to forgo Object/Array dirty checking,
+ * the `mutableData` flag defaults to false and must be set on the instance.
+ *
+ * Note, the performance characteristics of propagating large object graphs
+ * will be worse by relying on `mutableData: true` as opposed to using
+ * strict dirty checking with immutable patterns or Polymer's path notification
+ * API.
+ */
+interface OptionalMutableDataBehavior {
+
+  /**
+   * Instance-level flag for configuring the dirty-checking strategy
+   * for this element.  When true, Objects and Arrays will skip dirty
+   * checking, otherwise strict equality checking will be used.
+   */
+  mutableData: boolean|null|undefined;
+
+  /**
+   * Overrides `Polymer.PropertyEffects` to skip strict equality checking
+   * for Objects and Arrays.
+   *
+   * Pulls the value to dirty check against from the `__dataTemp` cache
+   * (rather than the normal `__data` cache) for Objects.  Since the temp
+   * cache is cleared at the end of a turn, this implementation allows
+   * side-effects of deep object changes to be processed by re-setting the
+   * same object (using the temp cache as an in-turn backstop to prevent
+   * cycles due to 2-way notification).
+   *
+   * @param property Property name
+   * @param value New property value
+   * @param old Previous property value
+   * @returns Whether the property should be considered a change
+   */
+  _shouldPropertyChange(property: string, value: any, old: any): boolean;
+}
+
+declare const OptionalMutableDataBehavior: object;
diff --git a/lib/legacy/polymer-fn.d.ts b/lib/legacy/polymer-fn.d.ts
new file mode 100644
index 0000000000..57a26a66ed
--- /dev/null
+++ b/lib/legacy/polymer-fn.d.ts
@@ -0,0 +1,23 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+
+import {Class} from './class.js';
+
+
+/**
+ * Legacy class factory and registration helper for defining Polymer
+ * elements.
+ *
+ * This method is equivalent to
+ *
+ *     import {Class} from '@polymer/polymer/lib/legacy/class.js';
+ *     customElements.define(info.is, Class(info));
+ *
+ * See `Class` for details on valid legacy metadata format for `info`.
+ *
+ * @returns Generated class
+ */
+declare function Polymer(info: PolymerInit): {new(): HTMLElement};
+
+export {Polymer};
+
+import {PolymerInit} from '../../interfaces';
diff --git a/lib/legacy/polymer.dom.d.ts b/lib/legacy/polymer.dom.d.ts
new file mode 100644
index 0000000000..d8dff4e1f1
--- /dev/null
+++ b/lib/legacy/polymer.dom.d.ts
@@ -0,0 +1,185 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+// tslint:disable:no-any describes the API as best we are able today
+
+import {FlattenedNodesObserver} from '../utils/flattened-nodes-observer.js';
+
+export {flush, enqueueDebouncer as addDebouncer} from '../utils/flush.js';
+
+import {Debouncer} from '../utils/debounce.js';
+
+export {matchesSelector};
+
+
+/**
+ * Cross-platform `element.matches` shim.
+ *
+ * @returns True if node matched selector
+ */
+declare function matchesSelector(node: Node, selector: string): boolean;
+
+/**
+ * Node API wrapper class returned from `Polymer.dom.(target)` when
+ * `target` is a `Node`.
+ */
+declare class DomApiNative {
+
+  /**
+   * For shadow roots, returns the currently focused element within this
+   * shadow root.
+   *
+   * return {Node|undefined} Currently focused element
+   */
+  readonly activeElement: any;
+  parentNode: Node|null;
+  firstChild: Node|null;
+  lastChild: Node|null;
+  nextSibling: Node|null;
+  previousSibling: Node|null;
+  firstElementChild: HTMLElement|null;
+  lastElementChild: HTMLElement|null;
+  nextElementSibling: HTMLElement|null;
+  previousElementSibling: HTMLElement|null;
+  childNodes: Node[];
+  children: HTMLElement[];
+  classList: DOMTokenList|null;
+  textContent: string;
+  innerHTML: string;
+
+  /**
+   * @param node Node for which to create a Polymer.dom helper object.
+   */
+  constructor(node: Node);
+
+  /**
+   * Returns an instance of `FlattenedNodesObserver` that
+   * listens for node changes on this element.
+   *
+   * @param callback Called when direct or distributed children
+   *   of this element changes
+   * @returns Observer instance
+   */
+  observeNodes(callback: (p0: {target: HTMLElement, addedNodes: Element[], removedNodes: Element[]}) => void): FlattenedNodesObserver;
+
+  /**
+   * Disconnects an observer previously created via `observeNodes`
+   *
+   * @param observerHandle Observer instance
+   *   to disconnect.
+   */
+  unobserveNodes(observerHandle: FlattenedNodesObserver): void;
+
+  /**
+   * Provided as a backwards-compatible API only.  This method does nothing.
+   */
+  notifyObserver(): void;
+
+  /**
+   * Returns true if the provided node is contained with this element's
+   * light-DOM children or shadow root, including any nested shadow roots
+   * of children therein.
+   *
+   * @param node Node to test
+   * @returns Returns true if the given `node` is contained within
+   *   this element's light or shadow DOM.
+   */
+  deepContains(node: Node|null): boolean;
+
+  /**
+   * Returns the root node of this node.  Equivalent to `getRootNode()`.
+   *
+   * @returns Top most element in the dom tree in which the node
+   * exists. If the node is connected to a document this is either a
+   * shadowRoot or the document; otherwise, it may be the node
+   * itself or a node or document fragment containing it.
+   */
+  getOwnerRoot(): Node;
+
+  /**
+   * For slot elements, returns the nodes assigned to the slot; otherwise
+   * an empty array. It is equivalent to `<slot>.addignedNodes({flatten:true})`.
+   *
+   * @returns Array of assigned nodes
+   */
+  getDistributedNodes(): Node[];
+
+  /**
+   * Returns an array of all slots this element was distributed to.
+   *
+   * @returns Description
+   */
+  getDestinationInsertionPoints(): HTMLSlotElement[];
+
+  /**
+   * Calls `importNode` on the `ownerDocument` for this node.
+   *
+   * @param node Node to import
+   * @param deep True if the node should be cloned deeply during
+   *   import
+   * @returns Clone of given node imported to this owner document
+   */
+  importNode(node: Node, deep: boolean): Node|null;
+
+  /**
+   * @returns Returns a flattened list of all child nodes and
+   * nodes assigned to child slots.
+   */
+  getEffectiveChildNodes(): Node[];
+
+  /**
+   * Returns a filtered list of flattened child elements for this element based
+   * on the given selector.
+   *
+   * @param selector Selector to filter nodes against
+   * @returns List of flattened child elements
+   */
+  queryDistributedElements(selector: string): HTMLElement[];
+  cloneNode(deep?: boolean): Node;
+  appendChild(node: Node): Node;
+  insertBefore(newChild: Node, refChild: Node|null): Node;
+  removeChild(node: Node): Node;
+  replaceChild(oldChild: Node, newChild: Node): Node;
+  removeAttribute(name: string): void;
+  querySelector(selector: string): Element|null;
+  querySelectorAll(selector: string): NodeListOf<Element>;
+}
+
+export {EventApi};
+
+/**
+ * Event API wrapper class returned from `dom.(target)` when
+ * `target` is an `Event`.
+ */
+declare class EventApi {
+
+  /**
+   * Returns the first node on the `composedPath` of this event.
+   */
+  readonly rootTarget: EventTarget;
+
+  /**
+   * Returns the local (re-targeted) target for this event.
+   */
+  readonly localTarget: EventTarget;
+
+  /**
+   * Returns the `composedPath` for this event.
+   */
+  readonly path: EventTarget[];
+  constructor(event: any);
+}
+
+export {dom};
+
+
+/**
+ * Legacy DOM and Event manipulation API wrapper factory used to abstract
+ * differences between native Shadow DOM and "Shady DOM" when polyfilling on
+ * older browsers.
+ *
+ * Note that in Polymer 2.x use of `Polymer.dom` is no longer required and
+ * in the majority of cases simply facades directly to the standard native
+ * API.
+ *
+ * @returns Wrapper providing either node API or event API
+ */
+declare function dom(obj?: Node|Event|DomApiNative|EventApi|null): DomApiNative|EventApi;
diff --git a/lib/legacy/templatizer-behavior.d.ts b/lib/legacy/templatizer-behavior.d.ts
new file mode 100644
index 0000000000..ed5ad73a70
--- /dev/null
+++ b/lib/legacy/templatizer-behavior.d.ts
@@ -0,0 +1,108 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+
+import {TemplateInstanceBase, templatize, modelForElement} from '../utils/templatize.js';
+
+export {Templatizer};
+
+/**
+ * The `Templatizer` behavior adds methods to generate instances of
+ * templates that are each managed by an anonymous `PropertyEffects`
+ * instance where data-bindings in the stamped template content are bound to
+ * accessors on itself.
+ *
+ * This behavior is provided in Polymer 2.x-3.x as a hybrid-element convenience
+ * only.  For non-hybrid usage, the `Templatize` library
+ * should be used instead.
+ *
+ * Example:
+ *
+ *     import {dom} from '@polymer/polymer/lib/legacy/polymer.dom.js';
+ *     // Get a template from somewhere, e.g. light DOM
+ *     let template = this.querySelector('template');
+ *     // Prepare the template
+ *     this.templatize(template);
+ *     // Instance the template with an initial data model
+ *     let instance = this.stamp({myProp: 'initial'});
+ *     // Insert the instance's DOM somewhere, e.g. light DOM
+ *     dom(this).appendChild(instance.root);
+ *     // Changing a property on the instance will propagate to bindings
+ *     // in the template
+ *     instance.myProp = 'new value';
+ *
+ * Users of `Templatizer` may need to implement the following abstract
+ * API's to determine how properties and paths from the host should be
+ * forwarded into to instances:
+ *
+ *     _forwardHostPropV2: function(prop, value)
+ *
+ * Likewise, users may implement these additional abstract API's to determine
+ * how instance-specific properties that change on the instance should be
+ * forwarded out to the host, if necessary.
+ *
+ *     _notifyInstancePropV2: function(inst, prop, value)
+ *
+ * In order to determine which properties are instance-specific and require
+ * custom notification via `_notifyInstanceProp`, define an `_instanceProps`
+ * object containing keys for each instance prop, for example:
+ *
+ *     _instanceProps: {
+ *       item: true,
+ *       index: true
+ *     }
+ *
+ * Any properties used in the template that are not defined in _instanceProp
+ * will be forwarded out to the Templatize `owner` automatically.
+ *
+ * Users may also implement the following abstract function to show or
+ * hide any DOM generated using `stamp`:
+ *
+ *     _showHideChildren: function(shouldHide)
+ *
+ * Note that some callbacks are suffixed with `V2` in the Polymer 2.x behavior
+ * as the implementations will need to differ from the callbacks required
+ * by the 1.x Templatizer API due to changes in the `TemplateInstance` API
+ * between versions 1.x and 2.x.
+ */
+interface Templatizer {
+
+  /**
+   * Generates an anonymous `TemplateInstance` class (stored as `this.ctor`)
+   * for the provided template.  This method should be called once per
+   * template to prepare an element for stamping the template, followed
+   * by `stamp` to create new instances of the template.
+   *
+   * @param template Template to prepare
+   * @param mutableData When `true`, the generated class will skip
+   *   strict dirty-checking for objects and arrays (always consider them to
+   *   be "dirty"). Defaults to false.
+   */
+  templatize(template: HTMLTemplateElement, mutableData?: boolean): void;
+
+  /**
+   * Creates an instance of the template prepared by `templatize`.  The object
+   * returned is an instance of the anonymous class generated by `templatize`
+   * whose `root` property is a document fragment containing newly cloned
+   * template content, and which has property accessors corresponding to
+   * properties referenced in template bindings.
+   *
+   * @param model Object containing initial property values to
+   *   populate into the template bindings.
+   * @returns Returns the created instance of
+   * the template prepared by `templatize`.
+   */
+  stamp(model?: object|null): TemplateInstanceBase|null;
+
+  /**
+   * Returns the template "model" (`TemplateInstance`) associated with
+   * a given element, which serves as the binding scope for the template
+   * instance the element is contained in.  A template model should be used
+   * to manipulate data associated with this template instance.
+   *
+   * @param el Element for which to return a template model.
+   * @returns Model representing the binding scope for
+   *   the element.
+   */
+  modelForElement(el: HTMLElement|null): TemplateInstanceBase|null;
+}
+
+declare const Templatizer: object;
diff --git a/lib/mixins/dir-mixin.d.ts b/lib/mixins/dir-mixin.d.ts
new file mode 100644
index 0000000000..5e62ed4708
--- /dev/null
+++ b/lib/mixins/dir-mixin.d.ts
@@ -0,0 +1,61 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+// tslint:disable:no-any describes the API as best we are able today
+
+import {PropertyAccessors} from './property-accessors.js';
+
+import {dedupingMixin} from '../utils/mixin.js';
+
+export {DirMixin};
+
+
+/**
+ * Element class mixin that allows elements to use the `:dir` CSS Selector to
+ * have text direction specific styling.
+ *
+ * With this mixin, any stylesheet provided in the template will transform
+ * `:dir` into `:host([dir])` and sync direction with the page via the
+ * element's `dir` attribute.
+ *
+ * Elements can opt out of the global page text direction by setting the `dir`
+ * attribute directly in `ready()` or in HTML.
+ *
+ * Caveats:
+ * - Applications must set `<html dir="ltr">` or `<html dir="rtl">` to sync
+ *   direction
+ * - Automatic left-to-right or right-to-left styling is sync'd with the
+ *   `<html>` element only.
+ * - Changing `dir` at runtime is supported.
+ * - Opting out of the global direction styling is permanent
+ */
+declare function DirMixin<T extends new (...args: any[]) => {}>(base: T): T & DirMixinConstructor & PropertyAccessorsConstructor & PropertiesChangedConstructor;
+
+import {PropertyAccessorsConstructor} from './property-accessors.js';
+
+import {PropertiesChangedConstructor, PropertiesChanged} from './properties-changed.js';
+
+interface DirMixinConstructor {
+  new(...args: any[]): DirMixin;
+
+  /**
+   * @param cssText .
+   * @param baseURI .
+   * @returns .
+   */
+  _processStyleText(cssText: string, baseURI: string): string;
+
+  /**
+   * Replace `:dir` in the given CSS text
+   *
+   * @param text CSS text to replace DIR
+   * @returns Modified CSS
+   */
+  _replaceDirInCssText(text: string): string;
+}
+
+export {DirMixinConstructor};
+
+interface DirMixin extends PropertyAccessors, PropertiesChanged {
+  ready(): void;
+  connectedCallback(): void;
+  disconnectedCallback(): void;
+}
diff --git a/lib/mixins/disable-upgrade-mixin.d.ts b/lib/mixins/disable-upgrade-mixin.d.ts
new file mode 100644
index 0000000000..9c9e6e2ed4
--- /dev/null
+++ b/lib/mixins/disable-upgrade-mixin.d.ts
@@ -0,0 +1,69 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+// tslint:disable:no-any describes the API as best we are able today
+
+import {ElementMixin} from './element-mixin.js';
+
+import {dedupingMixin} from '../utils/mixin.js';
+
+export {findObservedAttributesGetter};
+
+declare function findObservedAttributesGetter(): any;
+
+export {DisableUpgradeMixin};
+
+
+/**
+ * Element class mixin that allows the element to boot up in a non-enabled
+ * state when the `disable-upgrade` attribute is present. This mixin is
+ * designed to be used with element classes like PolymerElement that perform
+ * initial startup work when they are first connected. When the
+ * `disable-upgrade` attribute is removed, if the element is connected, it
+ * boots up and "enables" as it otherwise would; if it is not connected, the
+ * element boots up when it is next connected.
+ *
+ * Using `disable-upgrade` with PolymerElement prevents any data propagation
+ * to the element, any element DOM from stamping, or any work done in
+ * connected/disconnctedCallback from occuring, but it does not prevent work
+ * done in the element constructor.
+ *
+ * Note, this mixin must be applied on top of any element class that
+ * itself implements a `connectedCallback` so that it can control the work
+ * done in `connectedCallback`. For example,
+ *
+ *     MyClass = DisableUpgradeMixin(class extends BaseClass {...});
+ */
+declare function DisableUpgradeMixin<T extends new (...args: any[]) => {}>(base: T): T & DisableUpgradeMixinConstructor & ElementMixinConstructor & PropertyEffectsConstructor & TemplateStampConstructor & PropertyAccessorsConstructor & PropertiesChangedConstructor & PropertiesMixinConstructor;
+
+import {ElementMixinConstructor} from './element-mixin.js';
+
+import {PropertyEffectsConstructor, PropertyEffects} from './property-effects.js';
+
+import {TemplateStampConstructor, TemplateStamp} from './template-stamp.js';
+
+import {PropertyAccessorsConstructor, PropertyAccessors} from './property-accessors.js';
+
+import {PropertiesChangedConstructor, PropertiesChanged} from './properties-changed.js';
+
+import {PropertiesMixinConstructor, PropertiesMixin} from './properties-mixin.js';
+
+interface DisableUpgradeMixinConstructor {
+  new(...args: any[]): DisableUpgradeMixin;
+}
+
+export {DisableUpgradeMixinConstructor};
+
+interface DisableUpgradeMixin extends ElementMixin, PropertyEffects, TemplateStamp, PropertyAccessors, PropertiesChanged, PropertiesMixin {
+  _initializeProperties(): void;
+  _enableProperties(): void;
+
+  /**
+   * @param name Attribute name.
+   * @param old The previous value for the attribute.
+   * @param value The new value for the attribute.
+   * @param namespace The XML namespace for the attribute.
+   */
+  attributeChangedCallback(name: string, old: string|null, value: string|null, namespace: string|null): void;
+  connectedCallback(): void;
+  disconnectedCallback(): void;
+  _canApplyPropertyDefault(property: any): any;
+}
diff --git a/lib/mixins/element-mixin.d.ts b/lib/mixins/element-mixin.d.ts
new file mode 100644
index 0000000000..f9eef31279
--- /dev/null
+++ b/lib/mixins/element-mixin.d.ts
@@ -0,0 +1,284 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+// tslint:disable:no-any describes the API as best we are able today
+
+import {dedupingMixin} from '../utils/mixin.js';
+
+import {stylesFromTemplate, stylesFromModuleImports} from '../utils/style-gather.js';
+
+import {pathFromUrl, resolveCss, resolveUrl} from '../utils/resolve-url.js';
+
+import {DomModule} from '../elements/dom-module.js';
+
+import {PropertyEffects} from './property-effects.js';
+
+import {PropertiesMixin} from './properties-mixin.js';
+
+export {ElementMixin};
+
+
+/**
+ * Element class mixin that provides the core API for Polymer's meta-programming
+ * features including template stamping, data-binding, attribute deserialization,
+ * and property change observation.
+ *
+ * Subclassers may provide the following static getters to return metadata
+ * used to configure Polymer's features for the class:
+ *
+ * - `static get is()`: When the template is provided via a `dom-module`,
+ *   users should return the `dom-module` id from a static `is` getter.  If
+ *   no template is needed or the template is provided directly via the
+ *   `template` getter, there is no need to define `is` for the element.
+ *
+ * - `static get template()`: Users may provide the template directly (as
+ *   opposed to via `dom-module`) by implementing a static `template` getter.
+ *   The getter must return an `HTMLTemplateElement`.
+ *
+ * - `static get properties()`: Should return an object describing
+ *   property-related metadata used by Polymer features (key: property name
+ *   value: object containing property metadata). Valid keys in per-property
+ *   metadata include:
+ *   - `type` (String|Number|Object|Array|...): Used by
+ *     `attributeChangedCallback` to determine how string-based attributes
+ *     are deserialized to JavaScript property values.
+ *   - `notify` (boolean): Causes a change in the property to fire a
+ *     non-bubbling event called `<property>-changed`. Elements that have
+ *     enabled two-way binding to the property use this event to observe changes.
+ *   - `readOnly` (boolean): Creates a getter for the property, but no setter.
+ *     To set a read-only property, use the private setter method
+ *     `_setProperty(property, value)`.
+ *   - `observer` (string): Observer method name that will be called when
+ *     the property changes. The arguments of the method are
+ *     `(value, previousValue)`.
+ *   - `computed` (string): String describing method and dependent properties
+ *     for computing the value of this property (e.g. `'computeFoo(bar, zot)'`).
+ *     Computed properties are read-only by default and can only be changed
+ *     via the return value of the computing method.
+ *
+ * - `static get observers()`: Array of strings describing multi-property
+ *   observer methods and their dependent properties (e.g.
+ *   `'observeABC(a, b, c)'`).
+ *
+ * The base class provides default implementations for the following standard
+ * custom element lifecycle callbacks; users may override these, but should
+ * call the super method to ensure
+ * - `constructor`: Run when the element is created or upgraded
+ * - `connectedCallback`: Run each time the element is connected to the
+ *   document
+ * - `disconnectedCallback`: Run each time the element is disconnected from
+ *   the document
+ * - `attributeChangedCallback`: Run each time an attribute in
+ *   `observedAttributes` is set or removed (note: this element's default
+ *   `observedAttributes` implementation will automatically return an array
+ *   of dash-cased attributes based on `properties`)
+ */
+declare function ElementMixin<T extends new (...args: any[]) => {}>(base: T): T & ElementMixinConstructor & PropertyEffectsConstructor & TemplateStampConstructor & PropertyAccessorsConstructor & PropertiesChangedConstructor & PropertiesMixinConstructor;
+
+import {PropertyEffectsConstructor} from './property-effects.js';
+
+import {TemplateStampConstructor, TemplateStamp} from './template-stamp.js';
+
+import {PropertyAccessorsConstructor, PropertyAccessors} from './property-accessors.js';
+
+import {PropertiesChangedConstructor, PropertiesChanged} from './properties-changed.js';
+
+import {PropertiesMixinConstructor} from './properties-mixin.js';
+
+interface ElementMixinConstructor {
+  new(...args: any[]): ElementMixin;
+
+  /**
+   * Overrides `PropertyEffects` to add map of dynamic functions on
+   * template info, for consumption by `PropertyEffects` template binding
+   * code. This map determines which method templates should have accessors
+   * created for them.
+   *
+   * @param template Template
+   * @param templateInfo Template metadata for current template
+   * @param nodeInfo Node metadata for current template.
+   * @returns .
+   */
+  _parseTemplateContent(template: HTMLTemplateElement, templateInfo: TemplateInfo, nodeInfo: NodeInfo): boolean;
+
+  /**
+   * Override of PropertiesChanged createProperties to create accessors
+   * and property effects for all of the properties.
+   *
+   * @param props .
+   */
+  createProperties(props: object): void;
+
+  /**
+   * Overrides `PropertyEffects` to warn on use of undeclared properties in
+   * template.
+   *
+   * @param templateInfo Template metadata to add effect to
+   * @param prop Property that should trigger the effect
+   * @param effect Effect metadata object
+   */
+  _addTemplatePropertyEffect(templateInfo: object|null, prop: string, effect?: object|null): void;
+
+  /**
+   * Override of PropertiesMixin _finalizeClass to create observers and
+   * find the template.
+   */
+  _finalizeClass(): void;
+  _prepareTemplate(): void;
+
+  /**
+   * Creates observers for the given `observers` array.
+   * Leverages `PropertyEffects` to create observers.
+   *
+   * @param observers Array of observer descriptors for
+   *   this class
+   * @param dynamicFns Object containing keys for any properties
+   *   that are functions and should trigger the effect when the function
+   *   reference is changed
+   */
+  createObservers(observers: object|null, dynamicFns: object|null): void;
+
+  /**
+   * Gather style text for a style element in the template.
+   *
+   * @param cssText Text containing styling to process
+   * @param baseURI Base URI to rebase CSS paths against
+   * @returns The processed CSS text
+   */
+  _processStyleText(cssText: string, baseURI: string): string;
+
+  /**
+   * Configures an element `proto` to function with a given `template`.
+   * The element name `is` and extends `ext` must be specified for ShadyCSS
+   * style scoping.
+   *
+   * @param is Tag name (or type extension name) for this element
+   */
+  _finalizeTemplate(is: string): void;
+}
+
+export {ElementMixinConstructor};
+
+interface ElementMixin extends PropertyEffects, TemplateStamp, PropertyAccessors, PropertiesChanged, PropertiesMixin {
+  _template: HTMLTemplateElement|null;
+  _importPath: string;
+  rootPath: string;
+  importPath: string;
+  root: StampedTemplate|HTMLElement|ShadowRoot|null;
+  $: {[key: string]: Element};
+
+  /**
+   * Stamps the element template.
+   */
+  ready(): void;
+
+  /**
+   * Overrides the default `PropertyAccessors` to ensure class
+   * metaprogramming related to property accessors and effects has
+   * completed (calls `finalize`).
+   *
+   * It also initializes any property defaults provided via `value` in
+   * `properties` metadata.
+   */
+  _initializeProperties(): void;
+
+  /**
+   * Implements `PropertyEffects`'s `_readyClients` call. Attaches
+   * element dom by calling `_attachDom` with the dom stamped from the
+   * element's template via `_stampTemplate`. Note that this allows
+   * client dom to be attached to the element prior to any observers
+   * running.
+   */
+  _readyClients(): void;
+
+  /**
+   * Provides a default implementation of the standard Custom Elements
+   * `connectedCallback`.
+   *
+   * The default implementation enables the property effects system and
+   * flushes any pending properties, and updates shimmed CSS properties
+   * when using the ShadyCSS scoping/custom properties polyfill.
+   */
+  connectedCallback(): void;
+
+  /**
+   * Determines if a property dfeault can be applied. For example, this
+   * prevents a default from being applied when a property that has no
+   * accessor is overridden by its host before upgrade (e.g. via a binding).
+   *
+   * @param property Name of the property
+   * @returns Returns true if the property default can be applied.
+   */
+  _canApplyPropertyDefault(property: string): boolean;
+
+  /**
+   * Attaches an element's stamped dom to itself. By default,
+   * this method creates a `shadowRoot` and adds the dom to it.
+   * However, this method may be overridden to allow an element
+   * to put its dom in another location.
+   *
+   * @param dom to attach to the element.
+   * @returns node to which the dom has been attached.
+   */
+  _attachDom(dom: StampedTemplate|null): ShadowRoot|null;
+
+  /**
+   * When using the ShadyCSS scoping and custom property shim, causes all
+   * shimmed styles in this element (and its subtree) to be updated
+   * based on current custom property values.
+   *
+   * The optional parameter overrides inline custom property styles with an
+   * object of properties where the keys are CSS properties, and the values
+   * are strings.
+   *
+   * Example: `this.updateStyles({'--color': 'blue'})`
+   *
+   * These properties are retained unless a value of `null` is set.
+   *
+   * Note: This function does not support updating CSS mixins.
+   * You can not dynamically change the value of an `@apply`.
+   *
+   * @param properties Bag of custom property key/values to
+   *   apply to this element.
+   */
+  updateStyles(properties?: object|null): void;
+
+  /**
+   * Rewrites a given URL relative to a base URL. The base URL defaults to
+   * the original location of the document containing the `dom-module` for
+   * this element. This method will return the same URL before and after
+   * bundling.
+   *
+   * Note that this function performs no resolution for URLs that start
+   * with `/` (absolute URLs) or `#` (hash identifiers).  For general purpose
+   * URL resolution, use `window.URL`.
+   *
+   * @param url URL to resolve.
+   * @param base Optional base URL to resolve against, defaults
+   * to the element's `importPath`
+   * @returns Rewritten URL relative to base
+   */
+  resolveUrl(url: string, base?: string): string;
+}
+
+export {updateStyles};
+
+
+/**
+ * When using the ShadyCSS scoping and custom property shim, causes all
+ * shimmed `styles` (via `custom-style`) in the document (and its subtree)
+ * to be updated based on current custom property values.
+ *
+ * The optional parameter overrides inline custom property styles with an
+ * object of properties where the keys are CSS properties, and the values
+ * are strings.
+ *
+ * Example: `updateStyles({'--color': 'blue'})`
+ *
+ * These properties are retained unless a value of `null` is set.
+ */
+declare function updateStyles(props?: object|null): void;
+
+import {TemplateInfo} from '../../interfaces';
+
+import {NodeInfo} from '../../interfaces';
+
+import {StampedTemplate} from '../../interfaces';
diff --git a/lib/mixins/gesture-event-listeners.d.ts b/lib/mixins/gesture-event-listeners.d.ts
new file mode 100644
index 0000000000..49af2b8cad
--- /dev/null
+++ b/lib/mixins/gesture-event-listeners.d.ts
@@ -0,0 +1,47 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+// tslint:disable:no-any describes the API as best we are able today
+
+import {dedupingMixin} from '../utils/mixin.js';
+
+import {addListener, removeListener} from '../utils/gestures.js';
+
+export {GestureEventListeners};
+
+
+/**
+ * Element class mixin that provides API for adding Polymer's cross-platform
+ * gesture events to nodes.
+ *
+ * The API is designed to be compatible with override points implemented
+ * in `TemplateStamp` such that declarative event listeners in
+ * templates will support gesture events when this mixin is applied along with
+ * `TemplateStamp`.
+ */
+declare function GestureEventListeners<T extends new (...args: any[]) => {}>(base: T): T & GestureEventListenersConstructor;
+
+interface GestureEventListenersConstructor {
+  new(...args: any[]): GestureEventListeners;
+}
+
+export {GestureEventListenersConstructor};
+
+interface GestureEventListeners {
+
+  /**
+   * Add the event listener to the node if it is a gestures event.
+   *
+   * @param node Node to add event listener to
+   * @param eventName Name of event
+   * @param handler Listener function to add
+   */
+  _addEventListenerToNode(node: EventTarget, eventName: string, handler: (p0: Event) => void): void;
+
+  /**
+   * Remove the event listener to the node if it is a gestures event.
+   *
+   * @param node Node to remove event listener from
+   * @param eventName Name of event
+   * @param handler Listener function to remove
+   */
+  _removeEventListenerFromNode(node: EventTarget, eventName: string, handler: (p0: Event) => void): void;
+}
diff --git a/lib/mixins/mutable-data.d.ts b/lib/mixins/mutable-data.d.ts
new file mode 100644
index 0000000000..a06bc0858b
--- /dev/null
+++ b/lib/mixins/mutable-data.d.ts
@@ -0,0 +1,145 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+// tslint:disable:no-any describes the API as best we are able today
+
+import {dedupingMixin} from '../utils/mixin.js';
+
+export {MutableData};
+
+
+/**
+ * Element class mixin to skip strict dirty-checking for objects and arrays
+ * (always consider them to be "dirty"), for use on elements utilizing
+ * `PropertyEffects`
+ *
+ * By default, `PropertyEffects` performs strict dirty checking on
+ * objects, which means that any deep modifications to an object or array will
+ * not be propagated unless "immutable" data patterns are used (i.e. all object
+ * references from the root to the mutation were changed).
+ *
+ * Polymer also provides a proprietary data mutation and path notification API
+ * (e.g. `notifyPath`, `set`, and array mutation API's) that allow efficient
+ * mutation and notification of deep changes in an object graph to all elements
+ * bound to the same object graph.
+ *
+ * In cases where neither immutable patterns nor the data mutation API can be
+ * used, applying this mixin will cause Polymer to skip dirty checking for
+ * objects and arrays (always consider them to be "dirty").  This allows a
+ * user to make a deep modification to a bound object graph, and then either
+ * simply re-set the object (e.g. `this.items = this.items`) or call `notifyPath`
+ * (e.g. `this.notifyPath('items')`) to update the tree.  Note that all
+ * elements that wish to be updated based on deep mutations must apply this
+ * mixin or otherwise skip strict dirty checking for objects/arrays.
+ * Specifically, any elements in the binding tree between the source of a
+ * mutation and the consumption of it must apply this mixin or enable the
+ * `OptionalMutableData` mixin.
+ *
+ * In order to make the dirty check strategy configurable, see
+ * `OptionalMutableData`.
+ *
+ * Note, the performance characteristics of propagating large object graphs
+ * will be worse as opposed to using strict dirty checking with immutable
+ * patterns or Polymer's path notification API.
+ */
+declare function MutableData<T extends new (...args: any[]) => {}>(base: T): T & MutableDataConstructor;
+
+interface MutableDataConstructor {
+  new(...args: any[]): MutableData;
+}
+
+export {MutableDataConstructor};
+
+interface MutableData {
+
+  /**
+   * Overrides `PropertyEffects` to provide option for skipping
+   * strict equality checking for Objects and Arrays.
+   *
+   * This method pulls the value to dirty check against from the `__dataTemp`
+   * cache (rather than the normal `__data` cache) for Objects.  Since the temp
+   * cache is cleared at the end of a turn, this implementation allows
+   * side-effects of deep object changes to be processed by re-setting the
+   * same object (using the temp cache as an in-turn backstop to prevent
+   * cycles due to 2-way notification).
+   *
+   * @param property Property name
+   * @param value New property value
+   * @param old Previous property value
+   * @returns Whether the property should be considered a change
+   */
+  _shouldPropertyChange(property: string, value: any, old: any): boolean;
+}
+
+export {OptionalMutableData};
+
+
+/**
+ * Element class mixin to add the optional ability to skip strict
+ * dirty-checking for objects and arrays (always consider them to be
+ * "dirty") by setting a `mutable-data` attribute on an element instance.
+ *
+ * By default, `PropertyEffects` performs strict dirty checking on
+ * objects, which means that any deep modifications to an object or array will
+ * not be propagated unless "immutable" data patterns are used (i.e. all object
+ * references from the root to the mutation were changed).
+ *
+ * Polymer also provides a proprietary data mutation and path notification API
+ * (e.g. `notifyPath`, `set`, and array mutation API's) that allow efficient
+ * mutation and notification of deep changes in an object graph to all elements
+ * bound to the same object graph.
+ *
+ * In cases where neither immutable patterns nor the data mutation API can be
+ * used, applying this mixin will allow Polymer to skip dirty checking for
+ * objects and arrays (always consider them to be "dirty").  This allows a
+ * user to make a deep modification to a bound object graph, and then either
+ * simply re-set the object (e.g. `this.items = this.items`) or call `notifyPath`
+ * (e.g. `this.notifyPath('items')`) to update the tree.  Note that all
+ * elements that wish to be updated based on deep mutations must apply this
+ * mixin or otherwise skip strict dirty checking for objects/arrays.
+ * Specifically, any elements in the binding tree between the source of a
+ * mutation and the consumption of it must enable this mixin or apply the
+ * `MutableData` mixin.
+ *
+ * While this mixin adds the ability to forgo Object/Array dirty checking,
+ * the `mutableData` flag defaults to false and must be set on the instance.
+ *
+ * Note, the performance characteristics of propagating large object graphs
+ * will be worse by relying on `mutableData: true` as opposed to using
+ * strict dirty checking with immutable patterns or Polymer's path notification
+ * API.
+ */
+declare function OptionalMutableData<T extends new (...args: any[]) => {}>(base: T): T & OptionalMutableDataConstructor;
+
+interface OptionalMutableDataConstructor {
+  new(...args: any[]): OptionalMutableData;
+}
+
+export {OptionalMutableDataConstructor};
+
+interface OptionalMutableData {
+
+  /**
+   * Instance-level flag for configuring the dirty-checking strategy
+   * for this element.  When true, Objects and Arrays will skip dirty
+   * checking, otherwise strict equality checking will be used.
+   */
+  mutableData: boolean|null|undefined;
+
+  /**
+   * Overrides `PropertyEffects` to provide option for skipping
+   * strict equality checking for Objects and Arrays.
+   *
+   * When `this.mutableData` is true on this instance, this method
+   * pulls the value to dirty check against from the `__dataTemp` cache
+   * (rather than the normal `__data` cache) for Objects.  Since the temp
+   * cache is cleared at the end of a turn, this implementation allows
+   * side-effects of deep object changes to be processed by re-setting the
+   * same object (using the temp cache as an in-turn backstop to prevent
+   * cycles due to 2-way notification).
+   *
+   * @param property Property name
+   * @param value New property value
+   * @param old Previous property value
+   * @returns Whether the property should be considered a change
+   */
+  _shouldPropertyChange(property: string, value: any, old: any): boolean;
+}
diff --git a/lib/mixins/properties-changed.d.ts b/lib/mixins/properties-changed.d.ts
new file mode 100644
index 0000000000..98804e131c
--- /dev/null
+++ b/lib/mixins/properties-changed.d.ts
@@ -0,0 +1,305 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+// tslint:disable:no-any describes the API as best we are able today
+
+import {dedupingMixin} from '../utils/mixin.js';
+
+import {microTask} from '../utils/async.js';
+
+export {PropertiesChanged};
+
+
+/**
+ * Element class mixin that provides basic meta-programming for creating one
+ * or more property accessors (getter/setter pair) that enqueue an async
+ * (batched) `_propertiesChanged` callback.
+ *
+ * For basic usage of this mixin, call `MyClass.createProperties(props)`
+ * once at class definition time to create property accessors for properties
+ * named in props, implement `_propertiesChanged` to react as desired to
+ * property changes, and implement `static get observedAttributes()` and
+ * include lowercase versions of any property names that should be set from
+ * attributes. Last, call `this._enableProperties()` in the element's
+ * `connectedCallback` to enable the accessors.
+ */
+declare function PropertiesChanged<T extends new (...args: any[]) => {}>(base: T): T & PropertiesChangedConstructor;
+
+interface PropertiesChangedConstructor {
+  new(...args: any[]): PropertiesChanged;
+
+  /**
+   * Creates property accessors for the given property names.
+   *
+   * @param props Object whose keys are names of accessors.
+   */
+  createProperties(props: object): void;
+
+  /**
+   * Returns an attribute name that corresponds to the given property.
+   * The attribute name is the lowercased property name. Override to
+   * customize this mapping.
+   *
+   * @param property Property to convert
+   * @returns Attribute name corresponding to the given property.
+   */
+  attributeNameForProperty(property: string): string;
+
+  /**
+   * Override point to provide a type to which to deserialize a value to
+   * a given property.
+   *
+   * @param name Name of property
+   */
+  typeForProperty(name: string): void;
+}
+
+export {PropertiesChangedConstructor};
+
+interface PropertiesChanged {
+
+  /**
+   * Creates a setter/getter pair for the named property with its own
+   * local storage.  The getter returns the value in the local storage,
+   * and the setter calls `_setProperty`, which updates the local storage
+   * for the property and enqueues a `_propertiesChanged` callback.
+   *
+   * This method may be called on a prototype or an instance.  Calling
+   * this method may overwrite a property value that already exists on
+   * the prototype/instance by creating the accessor.
+   *
+   * @param property Name of the property
+   * @param readOnly When true, no setter is created; the
+   *   protected `_setProperty` function must be used to set the property
+   */
+  _createPropertyAccessor(property: string, readOnly?: boolean): void;
+
+  /**
+   * Adds the given `property` to a map matching attribute names
+   * to property names, using `attributeNameForProperty`. This map is
+   * used when deserializing attribute values to properties.
+   *
+   * @param property Name of the property
+   */
+  _addPropertyToAttributeMap(property: string): any;
+
+  /**
+   * Defines a property accessor for the given property.
+   *
+   * @param property Name of the property
+   * @param readOnly When true, no setter is created
+   */
+  _definePropertyAccessor(property: string, readOnly?: boolean): void;
+
+  /**
+   * Lifecycle callback called when properties are enabled via
+   * `_enableProperties`.
+   *
+   * Users may override this function to implement behavior that is
+   * dependent on the element having its property data initialized, e.g.
+   * from defaults (initialized from `constructor`, `_initializeProperties`),
+   * `attributeChangedCallback`, or values propagated from host e.g. via
+   * bindings.  `super.ready()` must be called to ensure the data system
+   * becomes enabled.
+   */
+  ready(): void;
+
+  /**
+   * Initializes the local storage for property accessors.
+   *
+   * Provided as an override point for performing any setup work prior
+   * to initializing the property accessor system.
+   */
+  _initializeProperties(): void;
+
+  /**
+   * Called at ready time with bag of instance properties that overwrote
+   * accessors when the element upgraded.
+   *
+   * The default implementation sets these properties back into the
+   * setter at ready time.  This method is provided as an override
+   * point for customizing or providing more efficient initialization.
+   *
+   * @param props Bag of property values that were overwritten
+   *   when creating property accessors.
+   */
+  _initializeInstanceProperties(props: object|null): void;
+
+  /**
+   * Updates the local storage for a property (via `_setPendingProperty`)
+   * and enqueues a `_proeprtiesChanged` callback.
+   *
+   * @param property Name of the property
+   * @param value Value to set
+   */
+  _setProperty(property: string, value: any): void;
+
+  /**
+   * Returns the value for the given property.
+   *
+   * @param property Name of property
+   * @returns Value for the given property
+   */
+  _getProperty(property: string): any;
+
+  /**
+   * Updates the local storage for a property, records the previous value,
+   * and adds it to the set of "pending changes" that will be passed to the
+   * `_propertiesChanged` callback.  This method does not enqueue the
+   * `_propertiesChanged` callback.
+   *
+   * @param property Name of the property
+   * @param value Value to set
+   * @param ext Not used here; affordance for closure
+   * @returns Returns true if the property changed
+   */
+  _setPendingProperty(property: string, value: any, ext?: boolean): boolean;
+
+  /**
+   * @param property Name of the property
+   * @returns Returns true if the property is pending.
+   */
+  _isPropertyPending(property: string): boolean;
+
+  /**
+   * Marks the properties as invalid, and enqueues an async
+   * `_propertiesChanged` callback.
+   */
+  _invalidateProperties(): void;
+
+  /**
+   * Call to enable property accessor processing. Before this method is
+   * called accessor values will be set but side effects are
+   * queued. When called, any pending side effects occur immediately.
+   * For elements, generally `connectedCallback` is a normal spot to do so.
+   * It is safe to call this method multiple times as it only turns on
+   * property accessors once.
+   */
+  _enableProperties(): void;
+
+  /**
+   * Calls the `_propertiesChanged` callback with the current set of
+   * pending changes (and old values recorded when pending changes were
+   * set), and resets the pending set of changes. Generally, this method
+   * should not be called in user code.
+   */
+  _flushProperties(): void;
+
+  /**
+   * Called in `_flushProperties` to determine if `_propertiesChanged`
+   * should be called. The default implementation returns true if
+   * properties are pending. Override to customize when
+   * `_propertiesChanged` is called.
+   *
+   * @param currentProps Bag of all current accessor values
+   * @param changedProps Bag of properties changed since the last
+   *   call to `_propertiesChanged`
+   * @param oldProps Bag of previous values for each property
+   *   in `changedProps`
+   * @returns true if changedProps is truthy
+   */
+  _shouldPropertiesChange(currentProps: object, changedProps: object|null, oldProps: object|null): boolean;
+
+  /**
+   * Callback called when any properties with accessors created via
+   * `_createPropertyAccessor` have been set.
+   *
+   * @param currentProps Bag of all current accessor values
+   * @param changedProps Bag of properties changed since the last
+   *   call to `_propertiesChanged`
+   * @param oldProps Bag of previous values for each property
+   *   in `changedProps`
+   */
+  _propertiesChanged(currentProps: object, changedProps: object|null, oldProps: object|null): void;
+
+  /**
+   * Method called to determine whether a property value should be
+   * considered as a change and cause the `_propertiesChanged` callback
+   * to be enqueued.
+   *
+   * The default implementation returns `true` if a strict equality
+   * check fails. The method always returns false for `NaN`.
+   *
+   * Override this method to e.g. provide stricter checking for
+   * Objects/Arrays when using immutable patterns.
+   *
+   * @param property Property name
+   * @param value New property value
+   * @param old Previous property value
+   * @returns Whether the property should be considered a change
+   *   and enqueue a `_proeprtiesChanged` callback
+   */
+  _shouldPropertyChange(property: string, value: any, old: any): boolean;
+
+  /**
+   * Implements native Custom Elements `attributeChangedCallback` to
+   * set an attribute value to a property via `_attributeToProperty`.
+   *
+   * @param name Name of attribute that changed
+   * @param old Old attribute value
+   * @param value New attribute value
+   * @param namespace Attribute namespace.
+   */
+  attributeChangedCallback(name: string, old: string|null, value: string|null, namespace: string|null): void;
+
+  /**
+   * Deserializes an attribute to its associated property.
+   *
+   * This method calls the `_deserializeValue` method to convert the string to
+   * a typed value.
+   *
+   * @param attribute Name of attribute to deserialize.
+   * @param value of the attribute.
+   * @param type type to deserialize to, defaults to the value
+   * returned from `typeForProperty`
+   */
+  _attributeToProperty(attribute: string, value: string|null, type?: any): void;
+
+  /**
+   * Serializes a property to its associated attribute.
+   *
+   * @param property Property name to reflect.
+   * @param attribute Attribute name to reflect to.
+   * @param value Property value to refect.
+   */
+  _propertyToAttribute(property: string, attribute?: string, value?: any): void;
+
+  /**
+   * Sets a typed value to an HTML attribute on a node.
+   *
+   * This method calls the `_serializeValue` method to convert the typed
+   * value to a string.  If the `_serializeValue` method returns `undefined`,
+   * the attribute will be removed (this is the default for boolean
+   * type `false`).
+   *
+   * @param node Element to set attribute to.
+   * @param value Value to serialize.
+   * @param attribute Attribute name to serialize to.
+   */
+  _valueToNodeAttribute(node: Element|null, value: any, attribute: string): void;
+
+  /**
+   * Converts a typed JavaScript value to a string.
+   *
+   * This method is called when setting JS property values to
+   * HTML attributes.  Users may override this method to provide
+   * serialization for custom types.
+   *
+   * @param value Property value to serialize.
+   * @returns String serialized from the provided
+   * property  value.
+   */
+  _serializeValue(value: any): string|undefined;
+
+  /**
+   * Converts a string to a typed JavaScript value.
+   *
+   * This method is called when reading HTML attribute values to
+   * JS properties.  Users may override this method to provide
+   * deserialization for custom `type`s. Types for `Boolean`, `String`,
+   * and `Number` convert attributes to the expected types.
+   *
+   * @param value Value to deserialize.
+   * @param type Type to deserialize the string to.
+   * @returns Typed value deserialized from the provided string.
+   */
+  _deserializeValue(value: string|null, type?: any): any;
+}
diff --git a/lib/mixins/properties-mixin.d.ts b/lib/mixins/properties-mixin.d.ts
new file mode 100644
index 0000000000..96e7ccef87
--- /dev/null
+++ b/lib/mixins/properties-mixin.d.ts
@@ -0,0 +1,77 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+// tslint:disable:no-any describes the API as best we are able today
+
+import {dedupingMixin} from '../utils/mixin.js';
+
+import {register, incrementInstanceCount} from '../utils/telemetry.js';
+
+import {PropertiesChanged} from './properties-changed.js';
+
+export {PropertiesMixin};
+
+
+/**
+ * Mixin that provides a minimal starting point to using the PropertiesChanged
+ * mixin by providing a mechanism to declare properties in a static
+ * getter (e.g. static get properties() { return { foo: String } }). Changes
+ * are reported via the `_propertiesChanged` method.
+ *
+ * This mixin provides no specific support for rendering. Users are expected
+ * to create a ShadowRoot and put content into it and update it in whatever
+ * way makes sense. This can be done in reaction to properties changing by
+ * implementing `_propertiesChanged`.
+ */
+declare function PropertiesMixin<T extends new (...args: any[]) => {}>(base: T): T & PropertiesMixinConstructor & PropertiesChangedConstructor;
+
+import {PropertiesChangedConstructor} from './properties-changed.js';
+
+interface PropertiesMixinConstructor {
+  new(...args: any[]): PropertiesMixin;
+
+  /**
+   * Overrides `PropertiesChanged` method to return type specified in the
+   * static `properties` object for the given property.
+   *
+   * @param name Name of property
+   * @returns Type to which to deserialize attribute
+   */
+  typeForProperty(name: string): any;
+
+  /**
+   * Finalizes an element definition, including ensuring any super classes
+   * are also finalized. This includes ensuring property
+   * accessors exist on the element prototype. This method calls
+   * `_finalizeClass` to finalize each constructor in the prototype chain.
+   */
+  finalize(): void;
+
+  /**
+   * Finalize an element class. This includes ensuring property
+   * accessors exist on the element prototype. This method is called by
+   * `finalize` and finalizes the class constructor.
+   */
+  _finalizeClass(): void;
+}
+
+export {PropertiesMixinConstructor};
+
+interface PropertiesMixin extends PropertiesChanged {
+
+  /**
+   * Overrides `PropertiesChanged` method and adds a call to
+   * `finalize` which lazily configures the element's property accessors.
+   */
+  _initializeProperties(): void;
+
+  /**
+   * Called when the element is added to a document.
+   * Calls `_enableProperties` to turn on property system from
+   * `PropertiesChanged`.
+   */
+  connectedCallback(): void;
+
+  /**
+   * Called when the element is removed from a document
+   */
+  disconnectedCallback(): void;
+}
diff --git a/lib/mixins/property-accessors.d.ts b/lib/mixins/property-accessors.d.ts
new file mode 100644
index 0000000000..259e191393
--- /dev/null
+++ b/lib/mixins/property-accessors.d.ts
@@ -0,0 +1,152 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+// tslint:disable:no-any describes the API as best we are able today
+
+import {dedupingMixin} from '../utils/mixin.js';
+
+import {camelToDashCase, dashToCamelCase} from '../utils/case-map.js';
+
+import {PropertiesChanged} from './properties-changed.js';
+
+export {PropertyAccessors};
+
+
+/**
+ * Element class mixin that provides basic meta-programming for creating one
+ * or more property accessors (getter/setter pair) that enqueue an async
+ * (batched) `_propertiesChanged` callback.
+ *
+ * For basic usage of this mixin:
+ *
+ * -   Declare attributes to observe via the standard `static get
+ *     observedAttributes()`. Use `dash-case` attribute names to represent
+ *     `camelCase` property names.
+ * -   Implement the `_propertiesChanged` callback on the class.
+ * -   Call `MyClass.createPropertiesForAttributes()` **once** on the class to
+ *     generate property accessors for each observed attribute. This must be
+ *     called before the first instance is created, for example, by calling it
+ *     before calling `customElements.define`. It can also be called lazily from
+ *     the element's `constructor`, as long as it's guarded so that the call is
+ *     only made once, when the first instance is created.
+ * -   Call `this._enableProperties()` in the element's `connectedCallback` to
+ *     enable the accessors.
+ *
+ * Any `observedAttributes` will automatically be
+ * deserialized via `attributeChangedCallback` and set to the associated
+ * property using `dash-case`-to-`camelCase` convention.
+ */
+declare function PropertyAccessors<T extends new (...args: any[]) => {}>(base: T): T & PropertyAccessorsConstructor & PropertiesChangedConstructor;
+
+import {PropertiesChangedConstructor} from './properties-changed.js';
+
+interface PropertyAccessorsConstructor {
+  new(...args: any[]): PropertyAccessors;
+
+  /**
+   * Returns an attribute name that corresponds to the given property.
+   * By default, converts camel to dash case, e.g. `fooBar` to `foo-bar`.
+   *
+   * @param property Property to convert
+   * @returns Attribute name corresponding to the given property.
+   */
+  attributeNameForProperty(property: string): string;
+
+  /**
+   * Generates property accessors for all attributes in the standard
+   * static `observedAttributes` array.
+   *
+   * Attribute names are mapped to property names using the `dash-case` to
+   * `camelCase` convention
+   */
+  createPropertiesForAttributes(): void;
+}
+
+export {PropertyAccessorsConstructor};
+
+interface PropertyAccessors extends PropertiesChanged {
+
+  /**
+   * Overrides PropertiesChanged implementation to save existing prototype
+   * property value so that it can be reset.
+   *
+   * @param property Name of the property
+   * @param readOnly When true, no setter is created
+   *
+   * When calling on a prototype, any overwritten values are saved in
+   * `__dataProto`, and it is up to the subclasser to decide how/when
+   * to set those properties back into the accessor.  When calling on an
+   * instance, the overwritten value is set via `_setPendingProperty`,
+   * and the user should call `_invalidateProperties` or `_flushProperties`
+   * for the values to take effect.
+   */
+  _definePropertyAccessor(property: string, readOnly?: boolean): void;
+
+  /**
+   * Overrides PropertiesChanged implementation to initialize values for
+   * accessors created for values that already existed on the element
+   * prototype.
+   */
+  _initializeProperties(): void;
+
+  /**
+   * Returns true if the specified property has a pending change.
+   *
+   * @param prop Property name
+   * @returns True if property has a pending change
+   */
+  _isPropertyPending(prop: string): boolean;
+
+  /**
+   * Overrides PropertiesChanged implemention to serialize objects as JSON.
+   *
+   * @param value Property value to serialize.
+   * @returns String serialized from the provided property
+   *     value.
+   */
+  _serializeValue(value: any): string|undefined;
+
+  /**
+   * Converts a string to a typed JavaScript value.
+   *
+   * This method is called by Polymer when reading HTML attribute values to
+   * JS properties.  Users may override this method on Polymer element
+   * prototypes to provide deserialization for custom `type`s.  Note,
+   * the `type` argument is the value of the `type` field provided in the
+   * `properties` configuration object for a given property, and is
+   * by convention the constructor for the type to deserialize.
+   *
+   * @param value Attribute value to deserialize.
+   * @param type Type to deserialize the string to.
+   * @returns Typed value deserialized from the provided string.
+   */
+  _deserializeValue(value: string|null, type?: any): any;
+
+  /**
+   * Called at instance time with bag of properties that were overwritten
+   * by accessors on the prototype when accessors were created.
+   *
+   * The default implementation sets these properties back into the
+   * setter at instance time.  This method is provided as an override
+   * point for customizing or providing more efficient initialization.
+   *
+   * @param props Bag of property values that were overwritten
+   *   when creating property accessors.
+   */
+  _initializeProtoProperties(props: object|null): void;
+
+  /**
+   * Ensures the element has the given attribute. If it does not,
+   * assigns the given value to the attribute.
+   *
+   * @param attribute Name of attribute to ensure is set.
+   * @param value of the attribute.
+   */
+  _ensureAttribute(attribute: string, value: string): void;
+
+  /**
+   * Returns true if this library created an accessor for the given property.
+   *
+   * @param property Property name
+   * @returns True if an accessor was created
+   */
+  _hasAccessor(property: string): boolean;
+}
diff --git a/lib/mixins/property-effects.d.ts b/lib/mixins/property-effects.d.ts
new file mode 100644
index 0000000000..02ebc40e57
--- /dev/null
+++ b/lib/mixins/property-effects.d.ts
@@ -0,0 +1,871 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+// tslint:disable:no-any describes the API as best we are able today
+
+import {dedupingMixin} from '../utils/mixin.js';
+
+import {root, isAncestor, isDescendant, get, translate, isPath, set, normalize} from '../utils/path.js';
+
+import {camelToDashCase, dashToCamelCase} from '../utils/case-map.js';
+
+import {PropertyAccessors} from './property-accessors.js';
+
+import {TemplateStamp} from './template-stamp.js';
+
+export {PropertyEffects};
+
+
+/**
+ * Element class mixin that provides meta-programming for Polymer's template
+ * binding and data observation (collectively, "property effects") system.
+ *
+ * This mixin uses provides the following key static methods for adding
+ * property effects to an element class:
+ * - `addPropertyEffect`
+ * - `createPropertyObserver`
+ * - `createMethodObserver`
+ * - `createNotifyingProperty`
+ * - `createReadOnlyProperty`
+ * - `createReflectedProperty`
+ * - `createComputedProperty`
+ * - `bindTemplate`
+ *
+ * Each method creates one or more property accessors, along with metadata
+ * used by this mixin's implementation of `_propertiesChanged` to perform
+ * the property effects.
+ *
+ * Underscored versions of the above methods also exist on the element
+ * prototype for adding property effects on instances at runtime.
+ *
+ * Note that this mixin overrides several `PropertyAccessors` methods, in
+ * many cases to maintain guarantees provided by the Polymer 1.x features;
+ * notably it changes property accessors to be synchronous by default
+ * whereas the default when using `PropertyAccessors` standalone is to be
+ * async by default.
+ */
+declare function PropertyEffects<T extends new (...args: any[]) => {}>(base: T): T & PropertyEffectsConstructor & TemplateStampConstructor & PropertyAccessorsConstructor & PropertiesChangedConstructor;
+
+import {TemplateStampConstructor} from './template-stamp.js';
+
+import {PropertyAccessorsConstructor} from './property-accessors.js';
+
+import {PropertiesChangedConstructor, PropertiesChanged} from './properties-changed.js';
+
+interface PropertyEffectsConstructor {
+  new(...args: any[]): PropertyEffects;
+
+  /**
+   * Overrides default `TemplateStamp` implementation to add support for
+   * parsing bindings from `TextNode`'s' `textContent`.  A `bindings`
+   * array is added to `nodeInfo` and populated with binding metadata
+   * with information capturing the binding target, and a `parts` array
+   * with one or more metadata objects capturing the source(s) of the
+   * binding.
+   *
+   * @param node Node to parse
+   * @param templateInfo Template metadata for current template
+   * @param nodeInfo Node metadata for current template node
+   * @returns `true` if the visited node added node-specific
+   *   metadata to `nodeInfo`
+   */
+  _parseTemplateNode(node: Node|null, templateInfo: TemplateInfo|null, nodeInfo: NodeInfo|null): boolean;
+
+  /**
+   * Overrides default `TemplateStamp` implementation to add support for
+   * binding the properties that a nested template depends on to the template
+   * as `_host_<property>`.
+   *
+   * @param node Node to parse
+   * @param templateInfo Template metadata for current template
+   * @param nodeInfo Node metadata for current template node
+   * @returns `true` if the visited node added node-specific
+   *   metadata to `nodeInfo`
+   */
+  _parseTemplateNestedTemplate(node: Node|null, templateInfo: TemplateInfo|null, nodeInfo: NodeInfo|null): boolean;
+
+  /**
+   * Overrides default `TemplateStamp` implementation to add support for
+   * parsing bindings from attributes.  A `bindings`
+   * array is added to `nodeInfo` and populated with binding metadata
+   * with information capturing the binding target, and a `parts` array
+   * with one or more metadata objects capturing the source(s) of the
+   * binding.
+   *
+   * @param node Node to parse
+   * @param templateInfo Template metadata for current template
+   * @param nodeInfo Node metadata for current template node
+   * @param name Attribute name
+   * @param value Attribute value
+   * @returns `true` if the visited node added node-specific
+   *   metadata to `nodeInfo`
+   */
+  _parseTemplateNodeAttribute(node: Element|null, templateInfo: TemplateInfo|null, nodeInfo: NodeInfo|null, name: string, value: string): boolean;
+
+  /**
+   * Ensures an accessor exists for the specified property, and adds
+   * to a list of "property effects" that will run when the accessor for
+   * the specified property is set.  Effects are grouped by "type", which
+   * roughly corresponds to a phase in effect processing.  The effect
+   * metadata should be in the following form:
+   *
+   *     {
+   *       fn: effectFunction, // Reference to function to call to perform effect
+   *       info: { ... }       // Effect metadata passed to function
+   *       trigger: {          // Optional triggering metadata; if not provided
+   *         name: string      // the property is treated as a wildcard
+   *         structured: boolean
+   *         wildcard: boolean
+   *       }
+   *     }
+   *
+   * Effects are called from `_propertiesChanged` in the following order by
+   * type:
+   *
+   * 1. COMPUTE
+   * 2. PROPAGATE
+   * 3. REFLECT
+   * 4. OBSERVE
+   * 5. NOTIFY
+   *
+   * Effect functions are called with the following signature:
+   *
+   *     effectFunction(inst, path, props, oldProps, info, hasPaths)
+   *
+   * @param property Property that should trigger the effect
+   * @param type Effect type, from this.PROPERTY_EFFECT_TYPES
+   * @param effect Effect metadata object
+   */
+  addPropertyEffect(property: string, type: string, effect?: object|null): void;
+
+  /**
+   * Creates a single-property observer for the given property.
+   *
+   * @param property Property name
+   * @param method Function or name of observer method to call
+   * @param dynamicFn Whether the method name should be included as
+   *   a dependency to the effect.
+   */
+  createPropertyObserver(property: string, method: string|((p0: any, p1: any) => any), dynamicFn?: boolean): void;
+
+  /**
+   * Creates a multi-property "method observer" based on the provided
+   * expression, which should be a string in the form of a normal JavaScript
+   * function signature: `'methodName(arg1, [..., argn])'`.  Each argument
+   * should correspond to a property or path in the context of this
+   * prototype (or instance), or may be a literal string or number.
+   *
+   * @param expression Method expression
+   * @param dynamicFn Boolean or object map indicating
+   * @returns whether method names should be included as a dependency to the effect.
+   */
+  createMethodObserver(expression: string, dynamicFn?: boolean|object|null): void;
+
+  /**
+   * Causes the setter for the given property to dispatch `<property>-changed`
+   * events to notify of changes to the property.
+   *
+   * @param property Property name
+   */
+  createNotifyingProperty(property: string): void;
+
+  /**
+   * Creates a read-only accessor for the given property.
+   *
+   * To set the property, use the protected `_setProperty` API.
+   * To create a custom protected setter (e.g. `_setMyProp()` for
+   * property `myProp`), pass `true` for `protectedSetter`.
+   *
+   * Note, if the property will have other property effects, this method
+   * should be called first, before adding other effects.
+   *
+   * @param property Property name
+   * @param protectedSetter Creates a custom protected setter
+   *   when `true`.
+   */
+  createReadOnlyProperty(property: string, protectedSetter?: boolean): void;
+
+  /**
+   * Causes the setter for the given property to reflect the property value
+   * to a (dash-cased) attribute of the same name.
+   *
+   * @param property Property name
+   */
+  createReflectedProperty(property: string): void;
+
+  /**
+   * Creates a computed property whose value is set to the result of the
+   * method described by the given `expression` each time one or more
+   * arguments to the method changes.  The expression should be a string
+   * in the form of a normal JavaScript function signature:
+   * `'methodName(arg1, [..., argn])'`
+   *
+   * @param property Name of computed property to set
+   * @param expression Method expression
+   * @param dynamicFn Boolean or object map indicating whether
+   *   method names should be included as a dependency to the effect.
+   */
+  createComputedProperty(property: string, expression: string, dynamicFn?: boolean|object|null): void;
+
+  /**
+   * Parses the provided template to ensure binding effects are created
+   * for them, and then ensures property accessors are created for any
+   * dependent properties in the template.  Binding effects for bound
+   * templates are stored in a linked list on the instance so that
+   * templates can be efficiently stamped and unstamped.
+   *
+   * @param template Template containing binding
+   *   bindings
+   * @returns Template metadata object
+   */
+  bindTemplate(template: HTMLTemplateElement): TemplateInfo;
+
+  /**
+   * Adds a property effect to the given template metadata, which is run
+   * at the "propagate" stage of `_propertiesChanged` when the template
+   * has been bound to the element via `_bindTemplate`.
+   *
+   * The `effect` object should match the format in `_addPropertyEffect`.
+   *
+   * @param templateInfo Template metadata to add effect to
+   * @param prop Property that should trigger the effect
+   * @param effect Effect metadata object
+   */
+  _addTemplatePropertyEffect(templateInfo: object|null, prop: string, effect?: object|null): void;
+
+  /**
+   * Called to parse text in a template (either attribute values or
+   * textContent) into binding metadata.
+   *
+   * Any overrides of this method should return an array of binding part
+   * metadata  representing one or more bindings found in the provided text
+   * and any "literal" text in between.  Any non-literal parts will be passed
+   * to `_evaluateBinding` when any dependencies change.  The only required
+   * fields of each "part" in the returned array are as follows:
+   *
+   * - `dependencies` - Array containing trigger metadata for each property
+   *   that should trigger the binding to update
+   * - `literal` - String containing text if the part represents a literal;
+   *   in this case no `dependencies` are needed
+   *
+   * Additional metadata for use by `_evaluateBinding` may be provided in
+   * each part object as needed.
+   *
+   * The default implementation handles the following types of bindings
+   * (one or more may be intermixed with literal strings):
+   * - Property binding: `[[prop]]`
+   * - Path binding: `[[object.prop]]`
+   * - Negated property or path bindings: `[[!prop]]` or `[[!object.prop]]`
+   * - Two-way property or path bindings (supports negation):
+   *   `{{prop}}`, `{{object.prop}}`, `{{!prop}}` or `{{!object.prop}}`
+   * - Inline computed method (supports negation):
+   *   `[[compute(a, 'literal', b)]]`, `[[!compute(a, 'literal', b)]]`
+   *
+   * The default implementation uses a regular expression for best
+   * performance. However, the regular expression uses a white-list of
+   * allowed characters in a data-binding, which causes problems for
+   * data-bindings that do use characters not in this white-list.
+   *
+   * Instead of updating the white-list with all allowed characters,
+   * there is a StrictBindingParser (see lib/mixins/strict-binding-parser)
+   * that uses a state machine instead. This state machine is able to handle
+   * all characters. However, it is slightly less performant, therefore we
+   * extracted it into a separate optional mixin.
+   *
+   * @param text Text to parse from attribute or textContent
+   * @param templateInfo Current template metadata
+   * @returns Array of binding part metadata
+   */
+  _parseBindings(text: string, templateInfo: object|null): BindingPart[]|null;
+
+  /**
+   * Called to evaluate a previously parsed binding part based on a set of
+   * one or more changed dependencies.
+   *
+   * @param inst Element that should be used as
+   *     scope for binding dependencies
+   * @param part Binding part metadata
+   * @param path Property/path that triggered this effect
+   * @param props Bag of current property changes
+   * @param oldProps Bag of previous values for changed properties
+   * @param hasPaths True with `props` contains one or more paths
+   * @returns Value the binding part evaluated to
+   */
+  _evaluateBinding(inst: PropertyEffects, part: BindingPart|null, path: string, props: object|null, oldProps: object|null, hasPaths: boolean): any;
+}
+
+export {PropertyEffectsConstructor};
+
+interface PropertyEffects extends TemplateStamp, PropertyAccessors, PropertiesChanged {
+  _overrideLegacyUndefined: boolean;
+  readonly PROPERTY_EFFECT_TYPES: any;
+
+  /**
+   * Stamps the provided template and performs instance-time setup for
+   * Polymer template features, including data bindings, declarative event
+   * listeners, and the `this.$` map of `id`'s to nodes.  A document fragment
+   * is returned containing the stamped DOM, ready for insertion into the
+   * DOM.
+   *
+   * This method may be called more than once; however note that due to
+   * `shadycss` polyfill limitations, only styles from templates prepared
+   * using `ShadyCSS.prepareTemplate` will be correctly polyfilled (scoped
+   * to the shadow root and support CSS custom properties), and note that
+   * `ShadyCSS.prepareTemplate` may only be called once per element. As such,
+   * any styles required by in runtime-stamped templates must be included
+   * in the main element template.
+   *
+   * @param template Template to stamp
+   * @param templateInfo Optional bound template info associated
+   *   with the template to be stamped; if omitted the template will be
+   *   automatically bound.
+   * @returns Cloned template content
+   */
+  _stampTemplate(template: HTMLTemplateElement, templateInfo?: TemplateInfo|null): StampedTemplate;
+
+  /**
+   * Overrides `PropertyAccessors` so that property accessor
+   * side effects are not enabled until after client dom is fully ready.
+   * Also calls `_flushClients` callback to ensure client dom is enabled
+   * that was not enabled as a result of flushing properties.
+   */
+  ready(): void;
+  _initializeProperties(): void;
+
+  /**
+   * Overrides `PropertyAccessors` implementation to avoid setting
+   * `_setProperty`'s `shouldNotify: true`.
+   *
+   * @param props Properties to initialize on the instance
+   */
+  _initializeInstanceProperties(props: object|null): void;
+
+  /**
+   * Overrides base implementation to ensure all accessors set `shouldNotify`
+   * to true, for per-property notification tracking.
+   *
+   * @param property Name of the property
+   * @param value Value to set
+   */
+  _setProperty(property: string, value: any): void;
+
+  /**
+   * Overrides the `PropertiesChanged` implementation to introduce special
+   * dirty check logic depending on the property & value being set:
+   *
+   * 1. Any value set to a path (e.g. 'obj.prop': 42 or 'obj.prop': {...})
+   *    Stored in `__dataTemp`, dirty checked against `__dataTemp`
+   * 2. Object set to simple property (e.g. 'prop': {...})
+   *    Stored in `__dataTemp` and `__data`, dirty checked against
+   *    `__dataTemp` by default implementation of `_shouldPropertyChange`
+   * 3. Primitive value set to simple property (e.g. 'prop': 42)
+   *    Stored in `__data`, dirty checked against `__data`
+   *
+   * The dirty-check is important to prevent cycles due to two-way
+   * notification, but paths and objects are only dirty checked against any
+   * previous value set during this turn via a "temporary cache" that is
+   * cleared when the last `_propertiesChanged` exits. This is so:
+   * a. any cached array paths (e.g. 'array.3.prop') may be invalidated
+   *    due to array mutations like shift/unshift/splice; this is fine
+   *    since path changes are dirty-checked at user entry points like `set`
+   * b. dirty-checking for objects only lasts one turn to allow the user
+   *    to mutate the object in-place and re-set it with the same identity
+   *    and have all sub-properties re-propagated in a subsequent turn.
+   *
+   * The temp cache is not necessarily sufficient to prevent invalid array
+   * paths, since a splice can happen during the same turn (with pathological
+   * user code); we could introduce a "fixup" for temporarily cached array
+   * paths if needed: https://github.com/Polymer/polymer/issues/4227
+   *
+   * @param property Name of the property
+   * @param value Value to set
+   * @param shouldNotify True if property should fire notification
+   *   event (applies only for `notify: true` properties)
+   * @returns Returns true if the property changed
+   */
+  _setPendingProperty(property: string, value: any, shouldNotify?: boolean): boolean;
+
+  /**
+   * Overrides `PropertyAccessor`'s default async queuing of
+   * `_propertiesChanged`: if `__dataReady` is false (has not yet been
+   * manually flushed), the function no-ops; otherwise flushes
+   * `_propertiesChanged` synchronously.
+   */
+  _invalidateProperties(): void;
+
+  /**
+   * Implements `PropertyAccessors`'s properties changed callback.
+   *
+   * Runs each class of effects for the batch of changed properties in
+   * a specific order (compute, propagate, reflect, observe, notify).
+   *
+   * @param currentProps Bag of all current accessor values
+   * @param changedProps Bag of properties changed since the last
+   *   call to `_propertiesChanged`
+   * @param oldProps Bag of previous values for each property
+   *   in `changedProps`
+   */
+  _propertiesChanged(currentProps: object, changedProps: object|null, oldProps: object|null): void;
+
+  /**
+   * Overrides `PropertyAccessors` implementation to provide a
+   * more efficient implementation of initializing properties from
+   * the prototype on the instance.
+   *
+   * @param props Properties to initialize on the prototype
+   */
+  _initializeProtoProperties(props: object|null): void;
+  _registerHost(): void;
+
+  /**
+   * Equivalent to static `addPropertyEffect` API but can be called on
+   * an instance to add effects at runtime.  See that method for
+   * full API docs.
+   *
+   * @param property Property that should trigger the effect
+   * @param type Effect type, from this.PROPERTY_EFFECT_TYPES
+   * @param effect Effect metadata object
+   */
+  _addPropertyEffect(property: string, type: string, effect?: object|null): void;
+
+  /**
+   * Removes the given property effect.
+   *
+   * @param property Property the effect was associated with
+   * @param type Effect type, from this.PROPERTY_EFFECT_TYPES
+   * @param effect Effect metadata object to remove
+   */
+  _removePropertyEffect(property: string, type: string, effect?: object|null): void;
+
+  /**
+   * Returns whether the current prototype/instance has a property effect
+   * of a certain type.
+   *
+   * @param property Property name
+   * @param type Effect type, from this.PROPERTY_EFFECT_TYPES
+   * @returns True if the prototype/instance has an effect of this
+   *     type
+   */
+  _hasPropertyEffect(property: string, type?: string): boolean;
+
+  /**
+   * Returns whether the current prototype/instance has a "read only"
+   * accessor for the given property.
+   *
+   * @param property Property name
+   * @returns True if the prototype/instance has an effect of this
+   *     type
+   */
+  _hasReadOnlyEffect(property: string): boolean;
+
+  /**
+   * Returns whether the current prototype/instance has a "notify"
+   * property effect for the given property.
+   *
+   * @param property Property name
+   * @returns True if the prototype/instance has an effect of this
+   *     type
+   */
+  _hasNotifyEffect(property: string): boolean;
+
+  /**
+   * Returns whether the current prototype/instance has a "reflect to
+   * attribute" property effect for the given property.
+   *
+   * @param property Property name
+   * @returns True if the prototype/instance has an effect of this
+   *     type
+   */
+  _hasReflectEffect(property: string): boolean;
+
+  /**
+   * Returns whether the current prototype/instance has a "computed"
+   * property effect for the given property.
+   *
+   * @param property Property name
+   * @returns True if the prototype/instance has an effect of this
+   *     type
+   */
+  _hasComputedEffect(property: string): boolean;
+
+  /**
+   * Sets a pending property or path.  If the root property of the path in
+   * question had no accessor, the path is set, otherwise it is enqueued
+   * via `_setPendingProperty`.
+   *
+   * This function isolates relatively expensive functionality necessary
+   * for the public API (`set`, `setProperties`, `notifyPath`, and property
+   * change listeners via {{...}} bindings), such that it is only done
+   * when paths enter the system, and not at every propagation step.  It
+   * also sets a `__dataHasPaths` flag on the instance which is used to
+   * fast-path slower path-matching code in the property effects host paths.
+   *
+   * `path` can be a path string or array of path parts as accepted by the
+   * public API.
+   *
+   * @param path Path to set
+   * @param value Value to set
+   * @param shouldNotify Set to true if this change should
+   *  cause a property notification event dispatch
+   * @param isPathNotification If the path being set is a path
+   *   notification of an already changed value, as opposed to a request
+   *   to set and notify the change.  In the latter `false` case, a dirty
+   *   check is performed and then the value is set to the path before
+   *   enqueuing the pending property change.
+   * @returns Returns true if the property/path was enqueued in
+   *   the pending changes bag.
+   */
+  _setPendingPropertyOrPath(path: string|Array<number|string>, value: any, shouldNotify?: boolean, isPathNotification?: boolean): boolean;
+
+  /**
+   * Applies a value to a non-Polymer element/node's property.
+   *
+   * The implementation makes a best-effort at binding interop:
+   * Some native element properties have side-effects when
+   * re-setting the same value (e.g. setting `<input>.value` resets the
+   * cursor position), so we do a dirty-check before setting the value.
+   * However, for better interop with non-Polymer custom elements that
+   * accept objects, we explicitly re-set object changes coming from the
+   * Polymer world (which may include deep object changes without the
+   * top reference changing), erring on the side of providing more
+   * information.
+   *
+   * Users may override this method to provide alternate approaches.
+   *
+   * @param node The node to set a property on
+   * @param prop The property to set
+   * @param value The value to set
+   */
+  _setUnmanagedPropertyToNode(node: Node, prop: string, value: any): void;
+
+  /**
+   * Enqueues the given client on a list of pending clients, whose
+   * pending property changes can later be flushed via a call to
+   * `_flushClients`.
+   *
+   * @param client PropertyEffects client to enqueue
+   */
+  _enqueueClient(client: object|null): void;
+
+  /**
+   * Flushes any clients previously enqueued via `_enqueueClient`, causing
+   * their `_flushProperties` method to run.
+   */
+  _flushClients(): void;
+
+  /**
+   * Perform any initial setup on client dom. Called before the first
+   * `_flushProperties` call on client dom and before any element
+   * observers are called.
+   */
+  _readyClients(): void;
+
+  /**
+   * Sets a bag of property changes to this instance, and
+   * synchronously processes all effects of the properties as a batch.
+   *
+   * Property names must be simple properties, not paths.  Batched
+   * path propagation is not supported.
+   *
+   * @param props Bag of one or more key-value pairs whose key is
+   *   a property and value is the new value to set for that property.
+   * @param setReadOnly When true, any private values set in
+   *   `props` will be set. By default, `setProperties` will not set
+   *   `readOnly: true` root properties.
+   */
+  setProperties(props: object|null, setReadOnly?: boolean): void;
+
+  /**
+   * Called to propagate any property changes to stamped template nodes
+   * managed by this element.
+   *
+   * @param changedProps Bag of changed properties
+   * @param oldProps Bag of previous values for changed properties
+   * @param hasPaths True with `props` contains one or more paths
+   */
+  _propagatePropertyChanges(changedProps: object|null, oldProps: object|null, hasPaths: boolean): void;
+  _runEffectsForTemplate(templateInfo: any, changedProps: any, oldProps: any, hasPaths: any): void;
+
+  /**
+   * Aliases one data path as another, such that path notifications from one
+   * are routed to the other.
+   *
+   * @param to Target path to link.
+   * @param from Source path to link.
+   */
+  linkPaths(to: string|Array<string|number>, from: string|Array<string|number>): void;
+
+  /**
+   * Removes a data path alias previously established with `_linkPaths`.
+   *
+   * Note, the path to unlink should be the target (`to`) used when
+   * linking the paths.
+   *
+   * @param path Target path to unlink.
+   */
+  unlinkPaths(path: string|Array<string|number>): void;
+
+  /**
+   * Notify that an array has changed.
+   *
+   * Example:
+   *
+   *     this.items = [ {name: 'Jim'}, {name: 'Todd'}, {name: 'Bill'} ];
+   *     ...
+   *     this.items.splice(1, 1, {name: 'Sam'});
+   *     this.items.push({name: 'Bob'});
+   *     this.notifySplices('items', [
+   *       { index: 1, removed: [{name: 'Todd'}], addedCount: 1,
+   *         object: this.items, type: 'splice' },
+   *       { index: 3, removed: [], addedCount: 1,
+   *         object: this.items, type: 'splice'}
+   *     ]);
+   *
+   * @param path Path that should be notified.
+   * @param splices Array of splice records indicating ordered
+   *   changes that occurred to the array. Each record should have the
+   *   following fields:
+   *    * index: index at which the change occurred
+   *    * removed: array of items that were removed from this index
+   *    * addedCount: number of new items added at this index
+   *    * object: a reference to the array in question
+   *    * type: the string literal 'splice'
+   *
+   *   Note that splice records _must_ be normalized such that they are
+   *   reported in index order (raw results from `Object.observe` are not
+   *   ordered and must be normalized/merged before notifying).
+   */
+  notifySplices(path: string, splices: any[]|null): void;
+
+  /**
+   * Convenience method for reading a value from a path.
+   *
+   * Note, if any part in the path is undefined, this method returns
+   * `undefined` (this method does not throw when dereferencing undefined
+   * paths).
+   *
+   * @param path Path to the value
+   *   to read.  The path may be specified as a string (e.g. `foo.bar.baz`)
+   *   or an array of path parts (e.g. `['foo.bar', 'baz']`).  Note that
+   *   bracketed expressions are not supported; string-based path parts
+   *   *must* be separated by dots.  Note that when dereferencing array
+   *   indices, the index may be used as a dotted part directly
+   *   (e.g. `users.12.name` or `['users', 12, 'name']`).
+   * @param root Root object from which the path is evaluated.
+   * @returns Value at the path, or `undefined` if any part of the path
+   *   is undefined.
+   */
+  get(path: string|Array<string|number>, root?: object|null): any;
+
+  /**
+   * Convenience method for setting a value to a path and notifying any
+   * elements bound to the same path.
+   *
+   * Note, if any part in the path except for the last is undefined,
+   * this method does nothing (this method does not throw when
+   * dereferencing undefined paths).
+   *
+   * @param path Path to the value
+   *   to write.  The path may be specified as a string (e.g. `'foo.bar.baz'`)
+   *   or an array of path parts (e.g. `['foo.bar', 'baz']`).  Note that
+   *   bracketed expressions are not supported; string-based path parts
+   *   *must* be separated by dots.  Note that when dereferencing array
+   *   indices, the index may be used as a dotted part directly
+   *   (e.g. `'users.12.name'` or `['users', 12, 'name']`).
+   * @param value Value to set at the specified path.
+   * @param root Root object from which the path is evaluated.
+   *   When specified, no notification will occur.
+   */
+  set(path: string|Array<string|number>, value: any, root?: object|null): void;
+
+  /**
+   * Adds items onto the end of the array at the path specified.
+   *
+   * The arguments after `path` and return value match that of
+   * `Array.prototype.push`.
+   *
+   * This method notifies other paths to the same array that a
+   * splice occurred to the array.
+   *
+   * @param path Path to array.
+   * @param items Items to push onto array
+   * @returns New length of the array.
+   */
+  push(path: string|Array<string|number>, ...items: any[]): number;
+
+  /**
+   * Removes an item from the end of array at the path specified.
+   *
+   * The arguments after `path` and return value match that of
+   * `Array.prototype.pop`.
+   *
+   * This method notifies other paths to the same array that a
+   * splice occurred to the array.
+   *
+   * @param path Path to array.
+   * @returns Item that was removed.
+   */
+  pop(path: string|Array<string|number>): any;
+
+  /**
+   * Starting from the start index specified, removes 0 or more items
+   * from the array and inserts 0 or more new items in their place.
+   *
+   * The arguments after `path` and return value match that of
+   * `Array.prototype.splice`.
+   *
+   * This method notifies other paths to the same array that a
+   * splice occurred to the array.
+   *
+   * @param path Path to array.
+   * @param start Index from which to start removing/inserting.
+   * @param deleteCount Number of items to remove.
+   * @param items Items to insert into array.
+   * @returns Array of removed items.
+   */
+  splice(path: string|Array<string|number>, start: number, deleteCount?: number, ...items: any[]): any[];
+
+  /**
+   * Removes an item from the beginning of array at the path specified.
+   *
+   * The arguments after `path` and return value match that of
+   * `Array.prototype.pop`.
+   *
+   * This method notifies other paths to the same array that a
+   * splice occurred to the array.
+   *
+   * @param path Path to array.
+   * @returns Item that was removed.
+   */
+  shift(path: string|Array<string|number>): any;
+
+  /**
+   * Adds items onto the beginning of the array at the path specified.
+   *
+   * The arguments after `path` and return value match that of
+   * `Array.prototype.push`.
+   *
+   * This method notifies other paths to the same array that a
+   * splice occurred to the array.
+   *
+   * @param path Path to array.
+   * @param items Items to insert info array
+   * @returns New length of the array.
+   */
+  unshift(path: string|Array<string|number>, ...items: any[]): number;
+
+  /**
+   * Notify that a path has changed.
+   *
+   * Example:
+   *
+   *     this.item.user.name = 'Bob';
+   *     this.notifyPath('item.user.name');
+   *
+   * @param path Path that should be notified.
+   * @param value Value at the path (optional).
+   */
+  notifyPath(path: string, value?: any): void;
+
+  /**
+   * Equivalent to static `createReadOnlyProperty` API but can be called on
+   * an instance to add effects at runtime.  See that method for
+   * full API docs.
+   *
+   * @param property Property name
+   * @param protectedSetter Creates a custom protected setter
+   *   when `true`.
+   */
+  _createReadOnlyProperty(property: string, protectedSetter?: boolean): void;
+
+  /**
+   * Equivalent to static `createPropertyObserver` API but can be called on
+   * an instance to add effects at runtime.  See that method for
+   * full API docs.
+   *
+   * @param property Property name
+   * @param method Function or name of observer method
+   *     to call
+   * @param dynamicFn Whether the method name should be included as
+   *   a dependency to the effect.
+   */
+  _createPropertyObserver(property: string, method: string|((p0: any, p1: any) => any), dynamicFn?: boolean): void;
+
+  /**
+   * Equivalent to static `createMethodObserver` API but can be called on
+   * an instance to add effects at runtime.  See that method for
+   * full API docs.
+   *
+   * @param expression Method expression
+   * @param dynamicFn Boolean or object map indicating
+   *   whether method names should be included as a dependency to the effect.
+   */
+  _createMethodObserver(expression: string, dynamicFn?: boolean|object|null): void;
+
+  /**
+   * Equivalent to static `createNotifyingProperty` API but can be called on
+   * an instance to add effects at runtime.  See that method for
+   * full API docs.
+   *
+   * @param property Property name
+   */
+  _createNotifyingProperty(property: string): void;
+
+  /**
+   * Equivalent to static `createReflectedProperty` API but can be called on
+   * an instance to add effects at runtime.  See that method for
+   * full API docs.
+   *
+   * @param property Property name
+   */
+  _createReflectedProperty(property: string): void;
+
+  /**
+   * Equivalent to static `createComputedProperty` API but can be called on
+   * an instance to add effects at runtime.  See that method for
+   * full API docs.
+   *
+   * @param property Name of computed property to set
+   * @param expression Method expression
+   * @param dynamicFn Boolean or object map indicating
+   *   whether method names should be included as a dependency to the effect.
+   */
+  _createComputedProperty(property: string, expression: string, dynamicFn?: boolean|object|null): void;
+
+  /**
+   * Equivalent to static `bindTemplate` API but can be called on an instance
+   * to add effects at runtime.  See that method for full API docs.
+   *
+   * This method may be called on the prototype (for prototypical template
+   * binding, to avoid creating accessors every instance) once per prototype,
+   * and will be called with `runtimeBinding: true` by `_stampTemplate` to
+   * create and link an instance of the template metadata associated with a
+   * particular stamping.
+   *
+   * @param template Template containing binding
+   * bindings
+   * @param instanceBinding When false (default), performs
+   * "prototypical" binding of the template and overwrites any previously
+   * bound template for the class. When true (as passed from
+   * `_stampTemplate`), the template info is instanced and linked into the
+   * list of bound templates.
+   * @returns Template metadata object; for `runtimeBinding`,
+   * this is an instance of the prototypical template info
+   */
+  _bindTemplate(template: HTMLTemplateElement, instanceBinding?: boolean): TemplateInfo;
+
+  /**
+   * Removes and unbinds the nodes previously contained in the provided
+   * DocumentFragment returned from `_stampTemplate`.
+   *
+   * @param dom DocumentFragment previously returned
+   *   from `_stampTemplate` associated with the nodes to be removed
+   */
+  _removeBoundDom(dom: StampedTemplate): void;
+}
+
+import {TemplateInfo} from '../../interfaces';
+
+import {NodeInfo} from '../../interfaces';
+
+import {BindingPart} from '../../interfaces';
+
+import {StampedTemplate} from '../../interfaces';
diff --git a/lib/mixins/strict-binding-parser.d.ts b/lib/mixins/strict-binding-parser.d.ts
new file mode 100644
index 0000000000..1161ec22aa
--- /dev/null
+++ b/lib/mixins/strict-binding-parser.d.ts
@@ -0,0 +1,72 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+// tslint:disable:no-any describes the API as best we are able today
+
+import {isPath} from '../utils/path.js';
+
+import {dedupingMixin} from '../utils/mixin.js';
+
+import {PropertyEffects} from './property-effects.js';
+
+
+/**
+ * Mixin that parses binding expressions and generates corresponding metadata.
+ * The implementation is different than in `property-effects`, as it uses a
+ * state machine instead of a regex. As such, this implementation is able to
+ * handle more cases, with the potential performance hit.
+ */
+declare function StrictBindingParser<T extends new (...args: any[]) => {}>(base: T): T & StrictBindingParserConstructor & PropertyEffectsConstructor & TemplateStampConstructor & PropertyAccessorsConstructor & PropertiesChangedConstructor;
+
+import {PropertyEffectsConstructor} from './property-effects.js';
+
+import {TemplateStampConstructor, TemplateStamp} from './template-stamp.js';
+
+import {PropertyAccessorsConstructor, PropertyAccessors} from './property-accessors.js';
+
+import {PropertiesChangedConstructor, PropertiesChanged} from './properties-changed.js';
+
+interface StrictBindingParserConstructor {
+  new(...args: any[]): StrictBindingParser;
+
+  /**
+   * Called to parse text in a template (either attribute values or
+   * textContent) into binding metadata.
+   *
+   * Any overrides of this method should return an array of binding part
+   * metadata  representing one or more bindings found in the provided text
+   * and any "literal" text in between.  Any non-literal parts will be passed
+   * to `_evaluateBinding` when any dependencies change.  The only required
+   * fields of each "part" in the returned array are as follows:
+   *
+   * - `dependencies` - Array containing trigger metadata for each property
+   *   that should trigger the binding to update
+   * - `literal` - String containing text if the part represents a literal;
+   *   in this case no `dependencies` are needed
+   *
+   * Additional metadata for use by `_evaluateBinding` may be provided in
+   * each part object as needed.
+   *
+   * The default implementation handles the following types of bindings
+   * (one or more may be intermixed with literal strings):
+   * - Property binding: `[[prop]]`
+   * - Path binding: `[[object.prop]]`
+   * - Negated property or path bindings: `[[!prop]]` or `[[!object.prop]]`
+   * - Two-way property or path bindings (supports negation):
+   *   `{{prop}}`, `{{object.prop}}`, `{{!prop}}` or `{{!object.prop}}`
+   * - Inline computed method (supports negation):
+   *   `[[compute(a, 'literal', b)]]`, `[[!compute(a, 'literal', b)]]`
+   *
+   * @param text Text to parse from attribute or textContent
+   * @param templateInfo Current template metadata
+   * @returns Array of binding part metadata
+   */
+  _parseBindings(text: string, templateInfo: object|null): BindingPart[]|null;
+}
+
+export {StrictBindingParserConstructor};
+
+interface StrictBindingParser extends PropertyEffects, TemplateStamp, PropertyAccessors, PropertiesChanged {
+}
+
+export {StrictBindingParser};
+
+import {BindingPart} from '../../interfaces';
diff --git a/lib/mixins/template-stamp.d.ts b/lib/mixins/template-stamp.d.ts
new file mode 100644
index 0000000000..fb7b2f8aa7
--- /dev/null
+++ b/lib/mixins/template-stamp.d.ts
@@ -0,0 +1,270 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+// tslint:disable:no-any describes the API as best we are able today
+
+import {dedupingMixin} from '../utils/mixin.js';
+
+export {TemplateStamp};
+
+
+/**
+ * Element mixin that provides basic template parsing and stamping, including
+ * the following template-related features for stamped templates:
+ *
+ * - Declarative event listeners (`on-eventname="listener"`)
+ * - Map of node id's to stamped node instances (`this.$.id`)
+ * - Nested template content caching/removal and re-installation (performance
+ *   optimization)
+ */
+declare function TemplateStamp<T extends new (...args: any[]) => {}>(base: T): T & TemplateStampConstructor;
+
+interface TemplateStampConstructor {
+  new(...args: any[]): TemplateStamp;
+
+  /**
+   * Scans a template to produce template metadata.
+   *
+   * Template-specific metadata are stored in the object returned, and node-
+   * specific metadata are stored in objects in its flattened `nodeInfoList`
+   * array.  Only nodes in the template that were parsed as nodes of
+   * interest contain an object in `nodeInfoList`.  Each `nodeInfo` object
+   * contains an `index` (`childNodes` index in parent) and optionally
+   * `parent`, which points to node info of its parent (including its index).
+   *
+   * The template metadata object returned from this method has the following
+   * structure (many fields optional):
+   *
+   * ```js
+   *   {
+   *     // Flattened list of node metadata (for nodes that generated metadata)
+   *     nodeInfoList: [
+   *       {
+   *         // `id` attribute for any nodes with id's for generating `$` map
+   *         id: {string},
+   *         // `on-event="handler"` metadata
+   *         events: [
+   *           {
+   *             name: {string},   // event name
+   *             value: {string},  // handler method name
+   *           }, ...
+   *         ],
+   *         // Notes when the template contained a `<slot>` for shady DOM
+   *         // optimization purposes
+   *         hasInsertionPoint: {boolean},
+   *         // For nested `<template>`` nodes, nested template metadata
+   *         templateInfo: {object}, // nested template metadata
+   *         // Metadata to allow efficient retrieval of instanced node
+   *         // corresponding to this metadata
+   *         parentInfo: {number},   // reference to parent nodeInfo>
+   *         parentIndex: {number},  // index in parent's `childNodes` collection
+   *         infoIndex: {number},    // index of this `nodeInfo` in `templateInfo.nodeInfoList`
+   *       },
+   *       ...
+   *     ],
+   *     // When true, the template had the `strip-whitespace` attribute
+   *     // or was nested in a template with that setting
+   *     stripWhitespace: {boolean},
+   *     // For nested templates, nested template content is moved into
+   *     // a document fragment stored here; this is an optimization to
+   *     // avoid the cost of nested template cloning
+   *     content: {DocumentFragment}
+   *   }
+   * ```
+   *
+   * This method kicks off a recursive treewalk as follows:
+   *
+   * ```
+   *    _parseTemplate <---------------------+
+   *      _parseTemplateContent              |
+   *        _parseTemplateNode  <------------|--+
+   *          _parseTemplateNestedTemplate --+  |
+   *          _parseTemplateChildNodes ---------+
+   *          _parseTemplateNodeAttributes
+   *            _parseTemplateNodeAttribute
+   *
+   * ```
+   *
+   * These methods may be overridden to add custom metadata about templates
+   * to either `templateInfo` or `nodeInfo`.
+   *
+   * Note that this method may be destructive to the template, in that
+   * e.g. event annotations may be removed after being noted in the
+   * template metadata.
+   *
+   * @param template Template to parse
+   * @param outerTemplateInfo Template metadata from the outer
+   *   template, for parsing nested templates
+   * @returns Parsed template metadata
+   */
+  _parseTemplate(template: HTMLTemplateElement, outerTemplateInfo?: TemplateInfo|null): TemplateInfo;
+
+  /**
+   * See docs for _parseTemplateNode.
+   *
+   * @param template .
+   * @param templateInfo .
+   * @param nodeInfo .
+   * @returns .
+   */
+  _parseTemplateContent(template: HTMLTemplateElement, templateInfo: TemplateInfo, nodeInfo: NodeInfo): boolean;
+
+  /**
+   * Parses template node and adds template and node metadata based on
+   * the current node, and its `childNodes` and `attributes`.
+   *
+   * This method may be overridden to add custom node or template specific
+   * metadata based on this node.
+   *
+   * @param node Node to parse
+   * @param templateInfo Template metadata for current template
+   * @param nodeInfo Node metadata for current template.
+   * @returns `true` if the visited node added node-specific
+   *   metadata to `nodeInfo`
+   */
+  _parseTemplateNode(node: Node|null, templateInfo: TemplateInfo, nodeInfo: NodeInfo): boolean;
+
+  /**
+   * Parses template child nodes for the given root node.
+   *
+   * This method also wraps whitelisted legacy template extensions
+   * (`is="dom-if"` and `is="dom-repeat"`) with their equivalent element
+   * wrappers, collapses text nodes, and strips whitespace from the template
+   * if the `templateInfo.stripWhitespace` setting was provided.
+   *
+   * @param root Root node whose `childNodes` will be parsed
+   * @param templateInfo Template metadata for current template
+   * @param nodeInfo Node metadata for current template.
+   */
+  _parseTemplateChildNodes(root: Node|null, templateInfo: TemplateInfo, nodeInfo: NodeInfo): void;
+
+  /**
+   * Parses template content for the given nested `<template>`.
+   *
+   * Nested template info is stored as `templateInfo` in the current node's
+   * `nodeInfo`. `template.content` is removed and stored in `templateInfo`.
+   * It will then be the responsibility of the host to set it back to the
+   * template and for users stamping nested templates to use the
+   * `_contentForTemplate` method to retrieve the content for this template
+   * (an optimization to avoid the cost of cloning nested template content).
+   *
+   * @param node Node to parse (a <template>)
+   * @param outerTemplateInfo Template metadata for current template
+   *   that includes the template `node`
+   * @param nodeInfo Node metadata for current template.
+   * @returns `true` if the visited node added node-specific
+   *   metadata to `nodeInfo`
+   */
+  _parseTemplateNestedTemplate(node: HTMLTemplateElement|null, outerTemplateInfo: TemplateInfo|null, nodeInfo: NodeInfo): boolean;
+
+  /**
+   * Parses template node attributes and adds node metadata to `nodeInfo`
+   * for nodes of interest.
+   *
+   * @param node Node to parse
+   * @param templateInfo Template metadata for current
+   *     template
+   * @param nodeInfo Node metadata for current template.
+   * @returns `true` if the visited node added node-specific
+   *   metadata to `nodeInfo`
+   */
+  _parseTemplateNodeAttributes(node: Element|null, templateInfo: TemplateInfo, nodeInfo: NodeInfo): boolean;
+
+  /**
+   * Parses a single template node attribute and adds node metadata to
+   * `nodeInfo` for attributes of interest.
+   *
+   * This implementation adds metadata for `on-event="handler"` attributes
+   * and `id` attributes.
+   *
+   * @param node Node to parse
+   * @param templateInfo Template metadata for current template
+   * @param nodeInfo Node metadata for current template.
+   * @param name Attribute name
+   * @param value Attribute value
+   * @returns `true` if the visited node added node-specific
+   *   metadata to `nodeInfo`
+   */
+  _parseTemplateNodeAttribute(node: Element|null, templateInfo: TemplateInfo, nodeInfo: NodeInfo, name: string, value: string): boolean;
+
+  /**
+   * Returns the `content` document fragment for a given template.
+   *
+   * For nested templates, Polymer performs an optimization to cache nested
+   * template content to avoid the cost of cloning deeply nested templates.
+   * This method retrieves the cached content for a given template.
+   *
+   * @param template Template to retrieve `content` for
+   * @returns Content fragment
+   */
+  _contentForTemplate(template: HTMLTemplateElement|null): DocumentFragment|null;
+}
+
+export {TemplateStampConstructor};
+
+interface TemplateStamp {
+
+  /**
+   * Clones the provided template content and returns a document fragment
+   * containing the cloned dom.
+   *
+   * The template is parsed (once and memoized) using this library's
+   * template parsing features, and provides the following value-added
+   * features:
+   * * Adds declarative event listeners for `on-event="handler"` attributes
+   * * Generates an "id map" for all nodes with id's under `$` on returned
+   *   document fragment
+   * * Passes template info including `content` back to templates as
+   *   `_templateInfo` (a performance optimization to avoid deep template
+   *   cloning)
+   *
+   * Note that the memoized template parsing process is destructive to the
+   * template: attributes for bindings and declarative event listeners are
+   * removed after being noted in notes, and any nested `<template>.content`
+   * is removed and stored in notes as well.
+   *
+   * @param template Template to stamp
+   * @param templateInfo Optional template info associated
+   *   with the template to be stamped; if omitted the template will be
+   *   automatically parsed.
+   * @returns Cloned template content
+   */
+  _stampTemplate(template: HTMLTemplateElement, templateInfo?: TemplateInfo|null): StampedTemplate;
+
+  /**
+   * Adds an event listener by method name for the event provided.
+   *
+   * This method generates a handler function that looks up the method
+   * name at handling time.
+   *
+   * @param node Node to add listener on
+   * @param eventName Name of event
+   * @param methodName Name of method
+   * @param context Context the method will be called on (defaults
+   *   to `node`)
+   * @returns Generated handler function
+   */
+  _addMethodEventListenerToNode(node: EventTarget, eventName: string, methodName: string, context?: any): Function|null;
+
+  /**
+   * Override point for adding custom or simulated event handling.
+   *
+   * @param node Node to add event listener to
+   * @param eventName Name of event
+   * @param handler Listener function to add
+   */
+  _addEventListenerToNode(node: EventTarget, eventName: string, handler: (p0: Event) => void): void;
+
+  /**
+   * Override point for adding custom or simulated event handling.
+   *
+   * @param node Node to remove event listener from
+   * @param eventName Name of event
+   * @param handler Listener function to remove
+   */
+  _removeEventListenerFromNode(node: EventTarget, eventName: string, handler: (p0: Event) => void): void;
+}
+
+import {TemplateInfo} from '../../interfaces';
+
+import {NodeInfo} from '../../interfaces';
+
+import {StampedTemplate} from '../../interfaces';
diff --git a/lib/utils/array-splice.d.ts b/lib/utils/array-splice.d.ts
new file mode 100644
index 0000000000..965fff77f3
--- /dev/null
+++ b/lib/utils/array-splice.d.ts
@@ -0,0 +1,33 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+// tslint:disable:no-any describes the API as best we are able today
+
+export {calculateSplices};
+
+
+/**
+ * Returns an array of splice records indicating the minimum edits required
+ * to transform the `previous` array into the `current` array.
+ *
+ * Splice records are ordered by index and contain the following fields:
+ * - `index`: index where edit started
+ * - `removed`: array of removed items from this index
+ * - `addedCount`: number of items added at this index
+ *
+ * This function is based on the Levenshtein "minimum edit distance"
+ * algorithm. Note that updates are treated as removal followed by addition.
+ *
+ * The worst-case time complexity of this algorithm is `O(l * p)`
+ *   l: The length of the current array
+ *   p: The length of the previous array
+ *
+ * However, the worst-case complexity is reduced by an `O(n)` optimization
+ * to detect any shared prefix & suffix between the two arrays and only
+ * perform the more expensive minimum edit distance calculation over the
+ * non-shared portions of the arrays.
+ *
+ * @returns Returns an array of splice record objects. Each of these
+ * contains: `index` the location where the splice occurred; `removed`
+ * the array of removed items from this location; `addedCount` the number
+ * of items added at this location.
+ */
+declare function calculateSplices(current: any[], previous: any[]): any[];
diff --git a/lib/utils/async.d.ts b/lib/utils/async.d.ts
new file mode 100644
index 0000000000..00c4f12c0a
--- /dev/null
+++ b/lib/utils/async.d.ts
@@ -0,0 +1,109 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+
+/**
+ * Async interface wrapper around `setTimeout`.
+ */
+declare namespace timeOut {
+
+
+  /**
+   * Returns a sub-module with the async interface providing the provided
+   * delay.
+   *
+   * @returns An async timeout interface
+   */
+  function after(delay?: number): AsyncInterface;
+
+
+  /**
+   * Enqueues a function called in the next task.
+   *
+   * @returns Handle used for canceling task
+   */
+  function run(fn: Function, delay?: number): number;
+
+
+  /**
+   * Cancels a previously enqueued `timeOut` callback.
+   */
+  function cancel(handle: number): void;
+}
+
+export {timeOut};
+
+/**
+ * Async interface wrapper around `requestAnimationFrame`.
+ */
+declare namespace animationFrame {
+
+
+  /**
+   * Enqueues a function called at `requestAnimationFrame` timing.
+   *
+   * @returns Handle used for canceling task
+   */
+  function run(fn: (p0: number) => void): number;
+
+
+  /**
+   * Cancels a previously enqueued `animationFrame` callback.
+   */
+  function cancel(handle: number): void;
+}
+
+export {animationFrame};
+
+/**
+ * Async interface wrapper around `requestIdleCallback`.  Falls back to
+ * `setTimeout` on browsers that do not support `requestIdleCallback`.
+ */
+declare namespace idlePeriod {
+
+
+  /**
+   * Enqueues a function called at `requestIdleCallback` timing.
+   *
+   * @returns Handle used for canceling task
+   */
+  function run(fn: (p0: IdleDeadline) => void): number;
+
+
+  /**
+   * Cancels a previously enqueued `idlePeriod` callback.
+   */
+  function cancel(handle: number): void;
+}
+
+export {idlePeriod};
+
+/**
+ * Async interface for enqueuing callbacks that run at microtask timing.
+ *
+ * Note that microtask timing is achieved via a single `MutationObserver`,
+ * and thus callbacks enqueued with this API will all run in a single
+ * batch, and not interleaved with other microtasks such as promises.
+ * Promises are avoided as an implementation choice for the time being
+ * due to Safari bugs that cause Promises to lack microtask guarantees.
+ */
+declare namespace microTask {
+
+
+  /**
+   * Enqueues a function called at microtask timing.
+   *
+   * @returns Handle used for canceling task
+   */
+  function run(callback?: Function): number;
+
+
+  /**
+   * Cancels a previously enqueued `microTask` callback.
+   */
+  function cancel(handle: number): void;
+}
+
+export {microTask};
+
+import {AsyncInterface} from '../../interfaces';
+
+import {IdleDeadline} from '../../interfaces';
diff --git a/lib/utils/boot.d.ts b/lib/utils/boot.d.ts
new file mode 100644
index 0000000000..fa456d79cd
--- /dev/null
+++ b/lib/utils/boot.d.ts
@@ -0,0 +1,4 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+
+
+export {};
diff --git a/lib/utils/case-map.d.ts b/lib/utils/case-map.d.ts
new file mode 100644
index 0000000000..efe0d0226d
--- /dev/null
+++ b/lib/utils/case-map.d.ts
@@ -0,0 +1,23 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+
+export {dashToCamelCase};
+
+
+/**
+ * Converts "dash-case" identifier (e.g. `foo-bar-baz`) to "camelCase"
+ * (e.g. `fooBarBaz`).
+ *
+ * @returns Camel-case representation of the identifier
+ */
+declare function dashToCamelCase(dash: string): string;
+
+export {camelToDashCase};
+
+
+/**
+ * Converts "camelCase" identifier (e.g. `fooBarBaz`) to "dash-case"
+ * (e.g. `foo-bar-baz`).
+ *
+ * @returns Dash-case representation of the identifier
+ */
+declare function camelToDashCase(camel: string): string;
diff --git a/lib/utils/debounce.d.ts b/lib/utils/debounce.d.ts
new file mode 100644
index 0000000000..9ea43021f8
--- /dev/null
+++ b/lib/utils/debounce.d.ts
@@ -0,0 +1,96 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+// tslint:disable:no-any describes the API as best we are able today
+
+export {Debouncer};
+
+declare class Debouncer {
+  constructor();
+
+  /**
+   * Creates a debouncer if no debouncer is passed as a parameter
+   * or it cancels an active debouncer otherwise. The following
+   * example shows how a debouncer can be called multiple times within a
+   * microtask and "debounced" such that the provided callback function is
+   * called once. Add this method to a custom element:
+   *
+   * ```js
+   * import {microTask} from '@polymer/polymer/lib/utils/async.js';
+   * import {Debouncer} from '@polymer/polymer/lib/utils/debounce.js';
+   * // ...
+   *
+   * _debounceWork() {
+   *   this._debounceJob = Debouncer.debounce(this._debounceJob,
+   *       microTask, () => this._doWork());
+   * }
+   * ```
+   *
+   * If the `_debounceWork` method is called multiple times within the same
+   * microtask, the `_doWork` function will be called only once at the next
+   * microtask checkpoint.
+   *
+   * Note: In testing it is often convenient to avoid asynchrony. To accomplish
+   * this with a debouncer, you can use `enqueueDebouncer` and
+   * `flush`. For example, extend the above example by adding
+   * `enqueueDebouncer(this._debounceJob)` at the end of the
+   * `_debounceWork` method. Then in a test, call `flush` to ensure
+   * the debouncer has completed.
+   *
+   * @param debouncer Debouncer object.
+   * @param asyncModule Object with Async interface
+   * @param callback Callback to run.
+   * @returns Returns a debouncer object.
+   */
+  static debounce(debouncer: Debouncer|null, asyncModule: AsyncInterface, callback: () => any): Debouncer;
+
+  /**
+   * Sets the scheduler; that is, a module with the Async interface,
+   * a callback and optional arguments to be passed to the run function
+   * from the async module.
+   *
+   * @param asyncModule Object with Async interface.
+   * @param callback Callback to run.
+   */
+  setConfig(asyncModule: AsyncInterface, callback: () => any): void;
+
+  /**
+   * Cancels an active debouncer and returns a reference to itself.
+   */
+  cancel(): void;
+
+  /**
+   * Cancels a debouncer's async callback.
+   */
+  _cancelAsync(): void;
+
+  /**
+   * Flushes an active debouncer and returns a reference to itself.
+   */
+  flush(): void;
+
+  /**
+   * Returns true if the debouncer is active.
+   *
+   * @returns True if active.
+   */
+  isActive(): boolean;
+}
+
+export {enqueueDebouncer};
+
+
+/**
+ * Adds a `Debouncer` to a list of globally flushable tasks.
+ */
+declare function enqueueDebouncer(debouncer: Debouncer): void;
+
+export {flushDebouncers};
+
+
+/**
+ * Flushes any enqueued debouncers
+ *
+ * @returns Returns whether any debouncers were flushed
+ */
+declare function flushDebouncers(): boolean;
+
+import {AsyncInterface} from '../../interfaces';
diff --git a/lib/utils/flattened-nodes-observer.d.ts b/lib/utils/flattened-nodes-observer.d.ts
new file mode 100644
index 0000000000..51ec9a19bd
--- /dev/null
+++ b/lib/utils/flattened-nodes-observer.d.ts
@@ -0,0 +1,84 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+// tslint:disable:no-any describes the API as best we are able today
+
+import {calculateSplices} from './array-splice.js';
+
+import {microTask} from './async.js';
+
+export {FlattenedNodesObserver};
+
+/**
+ * Class that listens for changes (additions or removals) to
+ * "flattened nodes" on a given `node`. The list of flattened nodes consists
+ * of a node's children and, for any children that are `<slot>` elements,
+ * the expanded flattened list of `assignedNodes`.
+ * For example, if the observed node has children `<a></a><slot></slot><b></b>`
+ * and the `<slot>` has one `<div>` assigned to it, then the flattened
+ * nodes list is `<a></a><div></div><b></b>`. If the `<slot>` has other
+ * `<slot>` elements assigned to it, these are flattened as well.
+ *
+ * The provided `callback` is called whenever any change to this list
+ * of flattened nodes occurs, where an addition or removal of a node is
+ * considered a change. The `callback` is called with one argument, an object
+ * containing an array of any `addedNodes` and `removedNodes`.
+ *
+ * Note: the callback is called asynchronous to any changes
+ * at a microtask checkpoint. This is because observation is performed using
+ * `MutationObserver` and the `<slot>` element's `slotchange` event which
+ * are asynchronous.
+ *
+ * An example:
+ * ```js
+ * class TestSelfObserve extends PolymerElement {
+ *   static get is() { return 'test-self-observe';}
+ *   connectedCallback() {
+ *     super.connectedCallback();
+ *     this._observer = new FlattenedNodesObserver(this, (info) => {
+ *       this.info = info;
+ *     });
+ *   }
+ *   disconnectedCallback() {
+ *     super.disconnectedCallback();
+ *     this._observer.disconnect();
+ *   }
+ * }
+ * customElements.define(TestSelfObserve.is, TestSelfObserve);
+ * ```
+ */
+declare class FlattenedNodesObserver {
+
+  /**
+   * eslint-disable-next-line
+   */
+  constructor(target: any, callback: any);
+
+  /**
+   * eslint-disable-next-line
+   */
+  static getFlattenedNodes(node: any): any;
+
+  /**
+   * Activates an observer. This method is automatically called when
+   * a `FlattenedNodesObserver` is created. It should only be called to
+   * re-activate an observer that has been deactivated via the `disconnect` method.
+   */
+  connect(): void;
+
+  /**
+   * Deactivates the flattened nodes observer. After calling this method
+   * the observer callback will not be called when changes to flattened nodes
+   * occur. The `connect` method may be subsequently called to reactivate
+   * the observer.
+   */
+  disconnect(): void;
+
+  /**
+   * Flushes the observer causing any pending changes to be immediately
+   * delivered the observer callback. By default these changes are delivered
+   * asynchronously at the next microtask checkpoint.
+   *
+   * @returns Returns true if any pending changes caused the observer
+   * callback to run.
+   */
+  flush(): boolean;
+}
diff --git a/lib/utils/flush.d.ts b/lib/utils/flush.d.ts
new file mode 100644
index 0000000000..1bc8779d04
--- /dev/null
+++ b/lib/utils/flush.d.ts
@@ -0,0 +1,15 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+
+import {enqueueDebouncer, flushDebouncers} from '../utils/debounce.js';
+
+export {enqueueDebouncer};
+
+export {flush};
+
+
+/**
+ * Forces several classes of asynchronously queued tasks to flush:
+ * - Debouncers added via `enqueueDebouncer`
+ * - ShadyDOM distribution
+ */
+declare function flush(): void;
diff --git a/lib/utils/gestures.d.ts b/lib/utils/gestures.d.ts
new file mode 100644
index 0000000000..e9d6147c20
--- /dev/null
+++ b/lib/utils/gestures.d.ts
@@ -0,0 +1,81 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+
+import {timeOut, microTask} from './async.js';
+
+import {Debouncer} from './debounce.js';
+
+export {deepTargetFind};
+
+
+/**
+ * Finds the element rendered on the screen at the provided coordinates.
+ *
+ * Similar to `document.elementFromPoint`, but pierces through
+ * shadow roots.
+ *
+ * @returns Returns the deepest shadowRoot inclusive element
+ * found at the screen position given.
+ */
+declare function deepTargetFind(x: number, y: number): Element|null;
+
+export {addListener};
+
+
+/**
+ * Adds an event listener to a node for the given gesture type.
+ *
+ * @returns Returns true if a gesture event listener was added.
+ */
+declare function addListener(node: EventTarget, evType: string, handler: (p0: Event) => void): boolean;
+
+export {removeListener};
+
+
+/**
+ * Removes an event listener from a node for the given gesture type.
+ *
+ * @returns Returns true if a gesture event listener was removed.
+ */
+declare function removeListener(node: EventTarget, evType: string, handler: (p0: Event) => void): boolean;
+
+export {register};
+
+
+/**
+ * Registers a new gesture event recognizer for adding new custom
+ * gesture event types.
+ */
+declare function register(recog: GestureRecognizer): void;
+
+export {setTouchAction};
+
+
+/**
+ * Sets scrolling direction on node.
+ *
+ * This value is checked on first move, thus it should be called prior to
+ * adding event listeners.
+ */
+declare function setTouchAction(node: EventTarget, value: string): void;
+
+export {prevent};
+
+
+/**
+ * Prevents the dispatch and default action of the given event name.
+ */
+declare function prevent(evName: string): void;
+
+export {resetMouseCanceller};
+
+
+/**
+ * Reset the 2500ms timeout on processing mouse input after detecting touch input.
+ *
+ * Touch inputs create synthesized mouse inputs anywhere from 0 to 2000ms after the touch.
+ * This method should only be called during testing with simulated touch inputs.
+ * Calling this method in production may cause duplicate taps or other Gestures.
+ */
+declare function resetMouseCanceller(): void;
+
+import {GestureRecognizer} from '../../interfaces';
diff --git a/lib/utils/hide-template-controls.d.ts b/lib/utils/hide-template-controls.d.ts
new file mode 100644
index 0000000000..62319b310a
--- /dev/null
+++ b/lib/utils/hide-template-controls.d.ts
@@ -0,0 +1,9 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+
+export {hideElementsGlobally};
+
+
+/**
+ * @returns True if elements will be hidden globally
+ */
+declare function hideElementsGlobally(): boolean;
diff --git a/lib/utils/html-tag.d.ts b/lib/utils/html-tag.d.ts
new file mode 100644
index 0000000000..4b7b7a2610
--- /dev/null
+++ b/lib/utils/html-tag.d.ts
@@ -0,0 +1,81 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+// tslint:disable:no-any describes the API as best we are able today
+
+/**
+ * Class representing a static string value which can be used to filter
+ * strings by asseting that they have been created via this class. The
+ * `value` property returns the string passed to the constructor.
+ */
+declare class LiteralString {
+  value: string;
+  constructor(string: any);
+
+  /**
+   * @returns LiteralString string value
+   */
+  toString(): string;
+}
+
+export {html};
+
+
+/**
+ * A template literal tag that creates an HTML <template> element from the
+ * contents of the string.
+ *
+ * This allows you to write a Polymer Template in JavaScript.
+ *
+ * Templates can be composed by interpolating `HTMLTemplateElement`s in
+ * expressions in the JavaScript template literal. The nested template's
+ * `innerHTML` is included in the containing template.  The only other
+ * values allowed in expressions are those returned from `htmlLiteral`
+ * which ensures only literal values from JS source ever reach the HTML, to
+ * guard against XSS risks.
+ *
+ * All other values are disallowed in expressions to help prevent XSS
+ * attacks; however, `htmlLiteral` can be used to compose static
+ * string values into templates. This is useful to compose strings into
+ * places that do not accept html, like the css text of a `style`
+ * element.
+ *
+ * Example:
+ *
+ *     static get template() {
+ *       return html`
+ *         <style>:host{ content:"..." }</style>
+ *         <div class="shadowed">${this.partialTemplate}</div>
+ *         ${super.template}
+ *       `;
+ *     }
+ *     static get partialTemplate() { return html`<span>Partial!</span>`; }
+ *
+ * @returns Constructed HTMLTemplateElement
+ */
+declare function html(strings: TemplateStringsArray, ...values: any[]): HTMLTemplateElement;
+
+export {htmlLiteral};
+
+
+/**
+ * An html literal tag that can be used with `html` to compose.
+ * a literal string.
+ *
+ * Example:
+ *
+ *     static get template() {
+ *       return html`
+ *         <style>
+ *           :host { display: block; }
+ *           ${this.styleTemplate()}
+ *         </style>
+ *         <div class="shadowed">${staticValue}</div>
+ *         ${super.template}
+ *       `;
+ *     }
+ *     static get styleTemplate() {
+ *        return htmlLiteral`.shadowed { background: gray; }`;
+ *     }
+ *
+ * @returns Constructed literal string
+ */
+declare function htmlLiteral(strings: TemplateStringsArray, ...values: any[]): LiteralString;
diff --git a/lib/utils/mixin.d.ts b/lib/utils/mixin.d.ts
new file mode 100644
index 0000000000..4f519e657d
--- /dev/null
+++ b/lib/utils/mixin.d.ts
@@ -0,0 +1,11 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+
+export {dedupingMixin};
+
+
+/**
+ * Wraps an ES6 class expression mixin such that the mixin is only applied
+ * if it has not already been applied its base argument. Also memoizes mixin
+ * applications.
+ */
+declare function dedupingMixin<T>(mixin: T): T;
diff --git a/lib/utils/path.d.ts b/lib/utils/path.d.ts
new file mode 100644
index 0000000000..2d8d7e07f1
--- /dev/null
+++ b/lib/utils/path.d.ts
@@ -0,0 +1,159 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+// tslint:disable:no-any describes the API as best we are able today
+
+export {isPath};
+
+
+/**
+ * Returns true if the given string is a structured data path (has dots).
+ *
+ * Example:
+ *
+ * ```
+ * isPath('foo.bar.baz') // true
+ * isPath('foo')         // false
+ * ```
+ *
+ * @returns True if the string contained one or more dots
+ */
+declare function isPath(path: string): boolean;
+
+export {root};
+
+
+/**
+ * Returns the root property name for the given path.
+ *
+ * Example:
+ *
+ * ```
+ * root('foo.bar.baz') // 'foo'
+ * root('foo')         // 'foo'
+ * ```
+ *
+ * @returns Root property name
+ */
+declare function root(path: string): string;
+
+export {isAncestor};
+
+
+/**
+ * Given `base` is `foo.bar`, `foo` is an ancestor, `foo.bar` is not
+ * Returns true if the given path is an ancestor of the base path.
+ *
+ * Example:
+ *
+ * ```
+ * isAncestor('foo.bar', 'foo')         // true
+ * isAncestor('foo.bar', 'foo.bar')     // false
+ * isAncestor('foo.bar', 'foo.bar.baz') // false
+ * ```
+ *
+ * @returns True if `path` is an ancestor of `base`.
+ */
+declare function isAncestor(base: string, path: string): boolean;
+
+export {isDescendant};
+
+
+/**
+ * Given `base` is `foo.bar`, `foo.bar.baz` is an descendant
+ *
+ * Example:
+ *
+ * ```
+ * isDescendant('foo.bar', 'foo.bar.baz') // true
+ * isDescendant('foo.bar', 'foo.bar')     // false
+ * isDescendant('foo.bar', 'foo')         // false
+ * ```
+ *
+ * @returns True if `path` is a descendant of `base`.
+ */
+declare function isDescendant(base: string, path: string): boolean;
+
+export {translate};
+
+
+/**
+ * Replaces a previous base path with a new base path, preserving the
+ * remainder of the path.
+ *
+ * User must ensure `path` has a prefix of `base`.
+ *
+ * Example:
+ *
+ * ```
+ * translate('foo.bar', 'zot', 'foo.bar.baz') // 'zot.baz'
+ * ```
+ *
+ * @returns Translated string
+ */
+declare function translate(base: string, newBase: string, path: string): string;
+
+export {matches};
+
+
+/**
+ * @returns True if `path` is equal to `base`
+ */
+declare function matches(base: string, path: string): boolean;
+
+export {normalize};
+
+
+/**
+ * Converts array-based paths to flattened path.  String-based paths
+ * are returned as-is.
+ *
+ * Example:
+ *
+ * ```
+ * normalize(['foo.bar', 0, 'baz'])  // 'foo.bar.0.baz'
+ * normalize('foo.bar.0.baz')        // 'foo.bar.0.baz'
+ * ```
+ *
+ * @returns Flattened path
+ */
+declare function normalize(path: string|Array<string|number>): string;
+
+export {split};
+
+
+/**
+ * Splits a path into an array of property names. Accepts either arrays
+ * of path parts or strings.
+ *
+ * Example:
+ *
+ * ```
+ * split(['foo.bar', 0, 'baz'])  // ['foo', 'bar', '0', 'baz']
+ * split('foo.bar.0.baz')        // ['foo', 'bar', '0', 'baz']
+ * ```
+ *
+ * @returns Array of path parts
+ */
+declare function split(path: string|Array<string|number>): string[];
+
+export {get};
+
+
+/**
+ * Reads a value from a path.  If any sub-property in the path is `undefined`,
+ * this method returns `undefined` (will never throw.
+ *
+ * @returns Value at path, or `undefined` if the path could not be
+ *  fully dereferenced.
+ */
+declare function get(root: object|null, path: string|Array<string|number>, info?: object|null): any;
+
+export {set};
+
+
+/**
+ * Sets a value to a path.  If any sub-property in the path is `undefined`,
+ * this method will no-op.
+ *
+ * @returns The normalized version of the input path
+ */
+declare function set(root: object|null, path: string|Array<string|number>, value: any): string|undefined;
diff --git a/lib/utils/render-status.d.ts b/lib/utils/render-status.d.ts
new file mode 100644
index 0000000000..993354c13b
--- /dev/null
+++ b/lib/utils/render-status.d.ts
@@ -0,0 +1,40 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+// tslint:disable:no-any describes the API as best we are able today
+
+export {flush};
+
+
+/**
+ * Flushes all `beforeNextRender` tasks, followed by all `afterNextRender`
+ * tasks.
+ */
+declare function flush(): void;
+
+export {beforeNextRender};
+
+
+/**
+ * Enqueues a callback which will be run before the next render, at
+ * `requestAnimationFrame` timing.
+ *
+ * This method is useful for enqueuing work that requires DOM measurement,
+ * since measurement may not be reliable in custom element callbacks before
+ * the first render, as well as for batching measurement tasks in general.
+ *
+ * Tasks in this queue may be flushed by calling `flush()`.
+ */
+declare function beforeNextRender(context: any, callback: (...p0: any[]) => void, args?: any[]): void;
+
+export {afterNextRender};
+
+
+/**
+ * Enqueues a callback which will be run after the next render, equivalent
+ * to one task (`setTimeout`) after the next `requestAnimationFrame`.
+ *
+ * This method is useful for tuning the first-render performance of an
+ * element or application by deferring non-critical work until after the
+ * first paint.  Typical non-render-critical work may include adding UI
+ * event listeners and aria attributes.
+ */
+declare function afterNextRender(context: any, callback: (...p0: any[]) => void, args?: any[]): void;
diff --git a/lib/utils/resolve-url.d.ts b/lib/utils/resolve-url.d.ts
new file mode 100644
index 0000000000..eb36fb8020
--- /dev/null
+++ b/lib/utils/resolve-url.d.ts
@@ -0,0 +1,37 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+
+export {resolveUrl};
+
+
+/**
+ * Resolves the given URL against the provided `baseUri'.
+ *
+ * Note that this function performs no resolution for URLs that start
+ * with `/` (absolute URLs) or `#` (hash identifiers).  For general purpose
+ * URL resolution, use `window.URL`.
+ *
+ * @returns resolved URL
+ */
+declare function resolveUrl(url: string, baseURI?: string|null): string;
+
+export {resolveCss};
+
+
+/**
+ * Resolves any relative URL's in the given CSS text against the provided
+ * `ownerDocument`'s `baseURI`.
+ *
+ * @returns Processed CSS text with resolved URL's
+ */
+declare function resolveCss(cssText: string, baseURI: string): string;
+
+export {pathFromUrl};
+
+
+/**
+ * Returns a path from a given `url`. The path includes the trailing
+ * `/` from the url.
+ *
+ * @returns resolved path
+ */
+declare function pathFromUrl(url: string): string;
diff --git a/lib/utils/scope-subtree.d.ts b/lib/utils/scope-subtree.d.ts
new file mode 100644
index 0000000000..1553d30da8
--- /dev/null
+++ b/lib/utils/scope-subtree.d.ts
@@ -0,0 +1,13 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+
+export {scopeSubtree};
+
+
+/**
+ * Ensure that elements in a ShadowDOM container are scoped correctly.
+ * This function is only needed when ShadyDOM is used and unpatched DOM APIs are used in third party code.
+ * This can happen in noPatch mode or when specialized APIs like ranges or tables are used to mutate DOM.
+ *
+ * @returns Returns a new MutationObserver on `container` if `shouldObserve` is true.
+ */
+declare function scopeSubtree(container: Element, shouldObserve?: boolean): MutationObserver|null;
diff --git a/lib/utils/settings.d.ts b/lib/utils/settings.d.ts
new file mode 100644
index 0000000000..046d4baa6a
--- /dev/null
+++ b/lib/utils/settings.d.ts
@@ -0,0 +1,150 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+// tslint:disable:no-any describes the API as best we are able today
+
+import {pathFromUrl} from './resolve-url.js';
+
+export {setRootPath};
+
+
+/**
+ * Sets the global rootPath property used by `ElementMixin` and
+ * available via `rootPath`.
+ */
+declare function setRootPath(path: string): void;
+
+export {setSanitizeDOMValue};
+
+
+/**
+ * Sets the global sanitizeDOMValue available via this module's exported
+ * `sanitizeDOMValue` variable.
+ */
+declare function setSanitizeDOMValue(newSanitizeDOMValue: ((p0: any, p1: string, p2: string, p3: Node|null) => any)|undefined): void;
+
+export {getSanitizeDOMValue};
+
+
+/**
+ * Gets sanitizeDOMValue, for environments that don't well support `export let`.
+ *
+ * @returns sanitizeDOMValue
+ */
+declare function getSanitizeDOMValue(): ((p0: any, p1: string, p2: string, p3: Node|null) => any)|undefined;
+
+export {setPassiveTouchGestures};
+
+
+/**
+ * Sets `passiveTouchGestures` globally for all elements using Polymer Gestures.
+ */
+declare function setPassiveTouchGestures(usePassive: boolean): void;
+
+export {setStrictTemplatePolicy};
+
+
+/**
+ * Sets `strictTemplatePolicy` globally for all elements
+ */
+declare function setStrictTemplatePolicy(useStrictPolicy: boolean): void;
+
+export {setAllowTemplateFromDomModule};
+
+
+/**
+ * Sets `lookupTemplateFromDomModule` globally for all elements
+ */
+declare function setAllowTemplateFromDomModule(allowDomModule: boolean): void;
+
+export {setLegacyOptimizations};
+
+
+/**
+ * Sets `legacyOptimizations` globally for all elements to enable optimizations
+ * when only legacy based elements are used.
+ */
+declare function setLegacyOptimizations(useLegacyOptimizations: boolean): void;
+
+export {setLegacyWarnings};
+
+
+/**
+ * Sets `legacyWarnings` globally for all elements to migration warnings.
+ */
+declare function setLegacyWarnings(useLegacyWarnings: boolean): void;
+
+export {setSyncInitialRender};
+
+
+/**
+ * Sets `syncInitialRender` globally for all elements to enable synchronous
+ * initial rendering.
+ */
+declare function setSyncInitialRender(useSyncInitialRender: boolean): void;
+
+export {setLegacyUndefined};
+
+
+/**
+ * Sets `legacyUndefined` globally for all elements to enable legacy
+ * multi-property behavior for undefined values.
+ */
+declare function setLegacyUndefined(useLegacyUndefined: boolean): void;
+
+export {setOrderedComputed};
+
+
+/**
+ * Sets `orderedComputed` globally for all elements to enable ordered computed
+ * property computation.
+ */
+declare function setOrderedComputed(useOrderedComputed: boolean): void;
+
+export {setCancelSyntheticClickEvents};
+
+
+/**
+ * Sets `setCancelSyntheticEvents` globally for all elements to cancel synthetic click events.
+ */
+declare function setCancelSyntheticClickEvents(useCancelSyntheticClickEvents: boolean): void;
+
+export {setRemoveNestedTemplates};
+
+
+/**
+ * Sets `removeNestedTemplates` globally, to eliminate nested templates
+ * inside `dom-if` and `dom-repeat` as part of template parsing.
+ */
+declare function setRemoveNestedTemplates(useRemoveNestedTemplates: boolean): void;
+
+export {setFastDomIf};
+
+
+/**
+ * Sets `fastDomIf` globally, to put `dom-if` in a performance-optimized mode.
+ */
+declare function setFastDomIf(useFastDomIf: boolean): void;
+
+export {setSuppressTemplateNotifications};
+
+
+/**
+ * Sets `suppressTemplateNotifications` globally, to disable `dom-change` and
+ * `rendered-item-count` events from `dom-if` and `dom-repeat`.
+ */
+declare function setSuppressTemplateNotifications(suppress: boolean): void;
+
+export {setLegacyNoObservedAttributes};
+
+
+/**
+ * Sets `legacyNoObservedAttributes` globally, to disable `observedAttributes`.
+ */
+declare function setLegacyNoObservedAttributes(noObservedAttributes: boolean): void;
+
+export {setUseAdoptedStyleSheetsWithBuiltCSS};
+
+
+/**
+ * Sets `useAdoptedStyleSheetsWithBuiltCSS` globally.
+ */
+declare function setUseAdoptedStyleSheetsWithBuiltCSS(value: boolean): void;
diff --git a/lib/utils/style-gather.d.ts b/lib/utils/style-gather.d.ts
new file mode 100644
index 0000000000..ec6a472516
--- /dev/null
+++ b/lib/utils/style-gather.d.ts
@@ -0,0 +1,101 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+
+import {DomModule} from '../elements/dom-module.js';
+
+import {resolveCss} from './resolve-url.js';
+
+export {stylesFromModules};
+
+
+/**
+ * Returns a list of <style> elements in a space-separated list of `dom-module`s.
+ *
+ * @returns Array of contained <style> elements
+ */
+declare function stylesFromModules(moduleIds: string): HTMLStyleElement[];
+
+export {stylesFromModule};
+
+
+/**
+ * Returns a list of <style> elements in a given `dom-module`.
+ * Styles in a `dom-module` can come either from `<style>`s within the
+ * first `<template>`, or else from one or more
+ * `<link rel="import" type="css">` links outside the template.
+ *
+ * @returns Array of contained styles.
+ */
+declare function stylesFromModule(moduleId: string): HTMLStyleElement[];
+
+export {stylesFromTemplate};
+
+
+/**
+ * Returns the `<style>` elements within a given template.
+ *
+ * @returns Array of styles
+ */
+declare function stylesFromTemplate(template: HTMLTemplateElement, baseURI?: string): HTMLStyleElement[];
+
+export {stylesFromModuleImports};
+
+
+/**
+ * Returns a list of <style> elements  from stylesheets loaded via `<link rel="import" type="css">` links within the specified `dom-module`.
+ *
+ * @returns Array of contained styles.
+ */
+declare function stylesFromModuleImports(moduleId: string): HTMLStyleElement[];
+
+export {cssFromModules};
+
+
+/**
+ * Returns CSS text of styles in a space-separated list of `dom-module`s.
+ * Note: This method is deprecated, use `stylesFromModules` instead.
+ *
+ * @returns Concatenated CSS content from specified `dom-module`s
+ */
+declare function cssFromModules(moduleIds: string): string;
+
+export {cssFromModule};
+
+
+/**
+ * Returns CSS text of styles in a given `dom-module`.  CSS in a `dom-module`
+ * can come either from `<style>`s within the first `<template>`, or else
+ * from one or more `<link rel="import" type="css">` links outside the
+ * template.
+ *
+ * Any `<styles>` processed are removed from their original location.
+ * Note: This method is deprecated, use `styleFromModule` instead.
+ *
+ * @returns Concatenated CSS content from specified `dom-module`
+ */
+declare function cssFromModule(moduleId: string): string;
+
+export {cssFromTemplate};
+
+
+/**
+ * Returns CSS text of `<styles>` within a given template.
+ *
+ * Any `<styles>` processed are removed from their original location.
+ * Note: This method is deprecated, use `styleFromTemplate` instead.
+ *
+ * @returns Concatenated CSS content from specified template
+ */
+declare function cssFromTemplate(template: HTMLTemplateElement, baseURI: string): string;
+
+export {cssFromModuleImports};
+
+
+/**
+ * Returns CSS text from stylesheets loaded via `<link rel="import" type="css">`
+ * links within the specified `dom-module`.
+ *
+ * Note: This method is deprecated, use `stylesFromModuleImports` instead.
+ *
+ * @returns Concatenated CSS content from links in specified `dom-module`
+ */
+declare function cssFromModuleImports(moduleId: string): string;
diff --git a/lib/utils/telemetry.d.ts b/lib/utils/telemetry.d.ts
new file mode 100644
index 0000000000..c5c840b48e
--- /dev/null
+++ b/lib/utils/telemetry.d.ts
@@ -0,0 +1,23 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+
+export {incrementInstanceCount};
+
+declare function incrementInstanceCount(): void;
+
+export {register};
+
+
+/**
+ * Registers a class prototype for telemetry purposes.
+ */
+declare function register(prototype: PolymerElementConstructor): void;
+
+export {dumpRegistrations};
+
+
+/**
+ * Logs all elements registered with an `is` to the console.
+ */
+declare function dumpRegistrations(): void;
+
+import {PolymerElementConstructor} from '../../interfaces';
diff --git a/lib/utils/templatize.d.ts b/lib/utils/templatize.d.ts
new file mode 100644
index 0000000000..4b3c3136d7
--- /dev/null
+++ b/lib/utils/templatize.d.ts
@@ -0,0 +1,186 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+// tslint:disable:no-any describes the API as best we are able today
+
+import {PropertyEffects} from '../mixins/property-effects.js';
+
+import {MutableData} from '../mixins/mutable-data.js';
+
+export {showHideChildren};
+
+declare function showHideChildren(): void;
+
+declare class TemplateInstanceBase extends
+  PropertyEffects(
+  HTMLElement) {
+  root: StampedTemplate;
+  children: any;
+
+  /**
+   * Find the parent model of this template instance.  The parent model
+   * is either another templatize instance that had option `parentModel: true`,
+   * or else the host element.
+   */
+  readonly parentModel: PropertyEffects;
+  _methodHost: PropertyEffects;
+
+  /**
+   * Override point for adding custom or simulated event handling.
+   *
+   * @param node Node to add event listener to
+   * @param eventName Name of event
+   * @param handler Listener function to add
+   */
+  _addEventListenerToNode(node: Node, eventName: string, handler: (p0: Event) => void): void;
+
+  /**
+   * Overrides default property-effects implementation to intercept
+   * textContent bindings while children are "hidden" and cache in
+   * private storage for later retrieval.
+   *
+   * @param node The node to set a property on
+   * @param prop The property to set
+   * @param value The value to set
+   */
+  _setUnmanagedPropertyToNode(node: Node, prop: string, value: any): void;
+
+  /**
+   * Forwards a host property to this instance.  This method should be
+   * called on instances from the `options.forwardHostProp` callback
+   * to propagate changes of host properties to each instance.
+   *
+   * Note this method enqueues the change, which are flushed as a batch.
+   *
+   * @param prop Property or path name
+   * @param value Value of the property to forward
+   */
+  forwardHostProp(prop: string, value: any): void;
+
+  /**
+   * Shows or hides the template instance top level child elements. For
+   * text nodes, `textContent` is removed while "hidden" and replaced when
+   * "shown."
+   *
+   * @param hide Set to true to hide the children;
+   * set to false to show them.
+   */
+  _showHideChildren(hide: boolean): void;
+
+  /**
+   * Stub of HTMLElement's `dispatchEvent`, so that effects that may
+   * dispatch events safely no-op.
+   *
+   * @param event Event to dispatch
+   * @returns Always true.
+   */
+  dispatchEvent(event: Event|null): boolean;
+}
+
+declare class templatizerBase extends TemplateInstanceBase {
+}
+
+export {templatize};
+
+
+/**
+ * Returns an anonymous `PropertyEffects` class bound to the
+ * `<template>` provided.  Instancing the class will result in the
+ * template being stamped into a document fragment stored as the instance's
+ * `root` property, after which it can be appended to the DOM.
+ *
+ * Templates may utilize all Polymer data-binding features as well as
+ * declarative event listeners.  Event listeners and inline computing
+ * functions in the template will be called on the host of the template.
+ *
+ * The constructor returned takes a single argument dictionary of initial
+ * property values to propagate into template bindings.  Additionally
+ * host properties can be forwarded in, and instance properties can be
+ * notified out by providing optional callbacks in the `options` dictionary.
+ *
+ * Valid configuration in `options` are as follows:
+ *
+ * - `forwardHostProp(property, value)`: Called when a property referenced
+ *   in the template changed on the template's host. As this library does
+ *   not retain references to templates instanced by the user, it is the
+ *   templatize owner's responsibility to forward host property changes into
+ *   user-stamped instances.  The `instance.forwardHostProp(property, value)`
+ *    method on the generated class should be called to forward host
+ *   properties into the template to prevent unnecessary property-changed
+ *   notifications. Any properties referenced in the template that are not
+ *   defined in `instanceProps` will be notified up to the template's host
+ *   automatically.
+ * - `instanceProps`: Dictionary of property names that will be added
+ *   to the instance by the templatize owner.  These properties shadow any
+ *   host properties, and changes within the template to these properties
+ *   will result in `notifyInstanceProp` being called.
+ * - `mutableData`: When `true`, the generated class will skip strict
+ *   dirty-checking for objects and arrays (always consider them to be
+ *   "dirty").
+ * - `notifyInstanceProp(instance, property, value)`: Called when
+ *   an instance property changes.  Users may choose to call `notifyPath`
+ *   on e.g. the owner to notify the change.
+ * - `parentModel`: When `true`, events handled by declarative event listeners
+ *   (`on-event="handler"`) will be decorated with a `model` property pointing
+ *   to the template instance that stamped it.  It will also be returned
+ *   from `instance.parentModel` in cases where template instance nesting
+ *   causes an inner model to shadow an outer model.
+ *
+ * All callbacks are called bound to the `owner`. Any context
+ * needed for the callbacks (such as references to `instances` stamped)
+ * should be stored on the `owner` such that they can be retrieved via
+ * `this`.
+ *
+ * When `options.forwardHostProp` is declared as an option, any properties
+ * referenced in the template will be automatically forwarded from the host of
+ * the `<template>` to instances, with the exception of any properties listed in
+ * the `options.instanceProps` object.  `instanceProps` are assumed to be
+ * managed by the owner of the instances, either passed into the constructor
+ * or set after the fact.  Note, any properties passed into the constructor will
+ * always be set to the instance (regardless of whether they would normally
+ * be forwarded from the host).
+ *
+ * Note that `templatize()` can be run only once for a given `<template>`.
+ * Further calls will result in an error. Also, there is a special
+ * behavior if the template was duplicated through a mechanism such as
+ * `<dom-repeat>` or `<test-fixture>`. In this case, all calls to
+ * `templatize()` return the same class for all duplicates of a template.
+ * The class returned from `templatize()` is generated only once using
+ * the `options` from the first call. This means that any `options`
+ * provided to subsequent calls will be ignored. Therefore, it is very
+ * important not to close over any variables inside the callbacks. Also,
+ * arrow functions must be avoided because they bind the outer `this`.
+ * Inside the callbacks, any contextual information can be accessed
+ * through `this`, which points to the `owner`.
+ *
+ * @returns Generated class bound
+ *   to the template provided
+ */
+declare function templatize(template: HTMLTemplateElement, owner?: PropertyEffects|null, options?: object|null): {new(p0?: object|null): TemplateInstanceBase};
+
+declare class baseClass extends TemplateInstanceBase {
+}
+
+export {modelForElement};
+
+
+/**
+ * Returns the template "model" associated with a given element, which
+ * serves as the binding scope for the template instance the element is
+ * contained in. A template model is an instance of
+ * `TemplateInstanceBase`, and should be used to manipulate data
+ * associated with this template instance.
+ *
+ * Example:
+ *
+ *   let model = modelForElement(el);
+ *   if (model.index < 10) {
+ *     model.set('item.checked', true);
+ *   }
+ *
+ * @returns Template instance representing the
+ *   binding scope for the element
+ */
+declare function modelForElement(template: HTMLElement|null, node?: Node|null): TemplateInstanceBase|null;
+
+export {TemplateInstanceBase};
+
+import {StampedTemplate} from '../../interfaces';
diff --git a/lib/utils/unresolved.d.ts b/lib/utils/unresolved.d.ts
new file mode 100644
index 0000000000..fa456d79cd
--- /dev/null
+++ b/lib/utils/unresolved.d.ts
@@ -0,0 +1,4 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+
+
+export {};
diff --git a/lib/utils/wrap.d.ts b/lib/utils/wrap.d.ts
new file mode 100644
index 0000000000..fa456d79cd
--- /dev/null
+++ b/lib/utils/wrap.d.ts
@@ -0,0 +1,4 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+
+
+export {};
diff --git a/package-lock.json b/package-lock.json
index 93199ea4a2..fc6677cf2f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,22 +14,23 @@
       }
     },
     "@babel/core": {
-      "version": "7.8.3",
-      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.8.3.tgz",
-      "integrity": "sha512-4XFkf8AwyrEG7Ziu3L2L0Cv+WyY47Tcsp70JFmpftbAA1K7YL/sgE9jh9HyNj08Y/U50ItUchpN0w6HxAoX1rA==",
+      "version": "7.9.6",
+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.9.6.tgz",
+      "integrity": "sha512-nD3deLvbsApbHAHttzIssYqgb883yU/d9roe4RZymBCDaZryMJDbptVpEpeQuRh4BJ+SYI8le9YGxKvFEvl1Wg==",
       "dev": true,
       "requires": {
         "@babel/code-frame": "^7.8.3",
-        "@babel/generator": "^7.8.3",
-        "@babel/helpers": "^7.8.3",
-        "@babel/parser": "^7.8.3",
-        "@babel/template": "^7.8.3",
-        "@babel/traverse": "^7.8.3",
-        "@babel/types": "^7.8.3",
+        "@babel/generator": "^7.9.6",
+        "@babel/helper-module-transforms": "^7.9.0",
+        "@babel/helpers": "^7.9.6",
+        "@babel/parser": "^7.9.6",
+        "@babel/template": "^7.8.6",
+        "@babel/traverse": "^7.9.6",
+        "@babel/types": "^7.9.6",
         "convert-source-map": "^1.7.0",
         "debug": "^4.1.0",
         "gensync": "^1.0.0-beta.1",
-        "json5": "^2.1.0",
+        "json5": "^2.1.2",
         "lodash": "^4.17.13",
         "resolve": "^1.3.2",
         "semver": "^5.4.1",
@@ -37,20 +38,14 @@
       },
       "dependencies": {
         "json5": {
-          "version": "2.1.1",
-          "resolved": "https://registry.npmjs.org/json5/-/json5-2.1.1.tgz",
-          "integrity": "sha512-l+3HXD0GEI3huGq1njuqtzYK8OYJyXMkOLtQ53pjWh89tvWS2h6l+1zMkYWqlb57+SiQodKZyvMEFb2X+KrFhQ==",
+          "version": "2.1.3",
+          "resolved": "https://registry.npmjs.org/json5/-/json5-2.1.3.tgz",
+          "integrity": "sha512-KXPvOm8K9IJKFM0bmdn8QXh7udDh1g/giieX0NLCaMnb4hEiVFqnop2ImTXCc5e0/oHz3LTqmHGtExn5hfMkOA==",
           "dev": true,
           "requires": {
-            "minimist": "^1.2.0"
+            "minimist": "^1.2.5"
           }
         },
-        "minimist": {
-          "version": "1.2.0",
-          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
-          "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
-          "dev": true
-        },
         "source-map": {
           "version": "0.5.7",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
@@ -60,12 +55,12 @@
       }
     },
     "@babel/generator": {
-      "version": "7.8.3",
-      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.8.3.tgz",
-      "integrity": "sha512-WjoPk8hRpDRqqzRpvaR8/gDUPkrnOOeuT2m8cNICJtZH6mwaCo3v0OKMI7Y6SM1pBtyijnLtAL0HDi41pf41ug==",
+      "version": "7.9.6",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.9.6.tgz",
+      "integrity": "sha512-+htwWKJbH2bL72HRluF8zumBxzuX0ZZUFl3JLNyoUjM/Ho8wnVpPXM6aUz8cfKDqQ/h7zHqKt4xzJteUosckqQ==",
       "dev": true,
       "requires": {
-        "@babel/types": "^7.8.3",
+        "@babel/types": "^7.9.6",
         "jsesc": "^2.5.1",
         "lodash": "^4.17.13",
         "source-map": "^0.5.0"
@@ -98,25 +93,15 @@
         "@babel/types": "^7.8.3"
       }
     },
-    "@babel/helper-call-delegate": {
-      "version": "7.8.3",
-      "resolved": "https://registry.npmjs.org/@babel/helper-call-delegate/-/helper-call-delegate-7.8.3.tgz",
-      "integrity": "sha512-6Q05px0Eb+N4/GTyKPPvnkig7Lylw+QzihMpws9iiZQv7ZImf84ZsZpQH7QoWN4n4tm81SnSzPgHw2qtO0Zf3A==",
-      "dev": true,
-      "requires": {
-        "@babel/helper-hoist-variables": "^7.8.3",
-        "@babel/traverse": "^7.8.3",
-        "@babel/types": "^7.8.3"
-      }
-    },
     "@babel/helper-create-regexp-features-plugin": {
-      "version": "7.8.3",
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+      "integrity": "sha512-64O87/dPDgfk8/RQqC4gkZoGyyWFIEUTTh80CU6CWuK5vkCGyekIx+oKcEIYtP/RAxSQltCZHCNu/mdd7fqlJw==",
       "dev": true,
       "requires": {
         "jsesc": "~0.5.0"
@@ -22837,9 +22649,9 @@
       }
     },
     "resolve": {
-      "version": "1.14.2",
-      "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.14.2.tgz",
-      "integrity": "sha512-EjlOBLBO1kxsUxsKjLt7TAECyKW6fOh1VRkykQkKGzcBbjjPIxBqGh0jf7GJ3k/f5mxMqW3htMD3WdTUVtW8HQ==",
+      "version": "1.17.0",
+      "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.17.0.tgz",
+      "integrity": "sha512-ic+7JYiV8Vi2yzQGFWOkiZD5Z9z7O2Zhm9XMaTxdJExKasieFCr+yXZ/WmXsckHiKl12ar0y6XiXDx3m4RHn1w==",
       "dev": true,
       "requires": {
         "path-parse": "^1.0.6"
@@ -22902,9 +22714,9 @@
       }
     },
     "rollup": {
-      "version": "1.29.1",
-      "resolved": "https://registry.npmjs.org/rollup/-/rollup-1.29.1.tgz",
-      "integrity": "sha512-dGQ+b9d1FOX/gluiggTAVnTvzQZUEkCi/TwZcax7ujugVRHs0nkYJlV9U4hsifGEMojnO+jvEML2CJQ6qXgbHA==",
+      "version": "1.32.1",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-1.32.1.tgz",
+      "integrity": "sha512-/2HA0Ec70TvQnXdzynFffkjA6XN+1e2pEv/uKS5Ulca40g2L7KuOE3riasHoNVHOsFD5KKZgDsMk1CP3Tw9s+A==",
       "dev": true,
       "requires": {
         "@types/estree": "*",
@@ -22913,21 +22725,18 @@
       },
       "dependencies": {
         "acorn": {
-          "version": "7.1.0",
-          "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.1.0.tgz",
-          "integrity": "sha512-kL5CuoXA/dgxlBbVrflsflzQ3PAas7RYZB52NOm/6839iVYJgKMJ3cQJD+t2i5+qFa8h3MDpEOJiS64E8JLnSQ==",
+          "version": "7.1.1",
+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.1.1.tgz",
+          "integrity": "sha512-add7dgA5ppRPxCFJoAGfMDi7PIBXq1RtGo7BhbLaxwrXPOmw8gq48Y9ozT01hUKy9byMjlR20EJhu5zlkErEkg==",
           "dev": true
         }
       }
     },
     "run-async": {
-      "version": "2.3.0",
-      "resolved": "https://registry.npmjs.org/run-async/-/run-async-2.3.0.tgz",
-      "integrity": "sha1-A3GrSuC91yDUFm19/aZP96RFpsA=",
-      "dev": true,
-      "requires": {
-        "is-promise": "^2.1.0"
-      }
+      "version": "2.4.1",
+      "resolved": "https://registry.npmjs.org/run-async/-/run-async-2.4.1.tgz",
+      "integrity": "sha512-tvVnVv01b8c1RrA6Ep7JkStj85Guv/YrMcwqYQnwjsAS2cTmmPGBBjAjpCW7RrSodNSoE2/qg9O4bceNvUuDgQ==",
+      "dev": true
     },
     "rx-lite": {
       "version": "4.0.8",
@@ -23059,9 +22868,9 @@
       "dev": true
     },
     "signal-exit": {
-      "version": "3.0.2",
-      "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.2.tgz",
-      "integrity": "sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0=",
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.3.tgz",
+      "integrity": "sha512-VUJ49FC8U1OxwZLxIbTTrDvLnf/6TDgxZcK8wxR8zs13xpx7xbG60ndBlhNrFi2EMuFRoeDoJO7wthSLq42EjA==",
       "dev": true
     },
     "simple-swizzle": {
@@ -23270,13 +23079,20 @@
       }
     },
     "source-map-support": {
-      "version": "0.5.16",
-      "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.16.tgz",
-      "integrity": "sha512-efyLRJDr68D9hBBNIPWFjhpFzURh+KJykQwvMyW5UiZzYwoF6l4YMMDIJJEyFWxWCqfyxLzz6tSfUFR+kXXsVQ==",
+      "version": "0.4.18",
+      "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.4.18.tgz",
+      "integrity": "sha512-try0/JqxPLF9nOjvSta7tVondkP5dwgyLDjVoyMDlmjugT2lRZ1OfsrYTkCd2hkDnJTKRbO/Rl3orm8vlsUzbA==",
       "dev": true,
       "requires": {
-        "buffer-from": "^1.0.0",
-        "source-map": "^0.6.0"
+        "source-map": "^0.5.6"
+      },
+      "dependencies": {
+        "source-map": {
+          "version": "0.5.7",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
+          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
+          "dev": true
+        }
       }
     },
     "source-map-url": {
@@ -23302,9 +23118,9 @@
       }
     },
     "spdx-exceptions": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/spdx-exceptions/-/spdx-exceptions-2.2.0.tgz",
-      "integrity": "sha512-2XQACfElKi9SlVb1CYadKDXvoajPgBVPn/gOQLrTvHdElaVhr7ZEbqJaRnJLVNeaI4cMEAgVCeBMKF6MWRDCRA==",
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/spdx-exceptions/-/spdx-exceptions-2.3.0.tgz",
+      "integrity": "sha512-/tTrYOC7PPI1nUAgx34hUpqXuyJG+DTHJTnIULG4rDygi4xu/tfgmq1e1cIRwRzwZgo4NLySi+ricLkZkw4i5A==",
       "dev": true
     },
     "spdx-expression-parse": {
@@ -23437,26 +23253,6 @@
         "strip-ansi": "^3.0.0"
       }
     },
-    "string.prototype.trimleft": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/string.prototype.trimleft/-/string.prototype.trimleft-2.1.1.tgz",
-      "integrity": "sha512-iu2AGd3PuP5Rp7x2kEZCrB2Nf41ehzh+goo8TV7z8/XDBbsvc6HQIlUl9RjkZ4oyrW1XM5UwlGl1oVEaDjg6Ag==",
-      "dev": true,
-      "requires": {
-        "define-properties": "^1.1.3",
-        "function-bind": "^1.1.1"
-      }
-    },
-    "string.prototype.trimright": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/string.prototype.trimright/-/string.prototype.trimright-2.1.1.tgz",
-      "integrity": "sha512-qFvWL3/+QIgZXVmJBfpHmxLB7xsUXz6HsUmP8+5dRaC3Q7oKUv9Vo6aMCRZC1smrtyECFsIT30PqBJ1gTjAs+g==",
-      "dev": true,
-      "requires": {
-        "define-properties": "^1.1.3",
-        "function-bind": "^1.1.1"
-      }
-    },
     "string_decoder": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.3.0.tgz",
@@ -24001,15 +23797,15 @@
       }
     },
     "unicode-match-property-value-ecmascript": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/unicode-match-property-value-ecmascript/-/unicode-match-property-value-ecmascript-1.1.0.tgz",
-      "integrity": "sha512-hDTHvaBk3RmFzvSl0UVrUmC3PuW9wKVnpoUDYH0JDkSIovzw+J5viQmeYHxVSBptubnr7PbH2e0fnpDRQnQl5g==",
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/unicode-match-property-value-ecmascript/-/unicode-match-property-value-ecmascript-1.2.0.tgz",
+      "integrity": "sha512-wjuQHGQVofmSJv1uVISKLE5zO2rNGzM/KCYZch/QQvez7C1hUhBIuZ701fYXExuufJFMPhv2SyL8CyoIfMLbIQ==",
       "dev": true
     },
     "unicode-property-aliases-ecmascript": {
-      "version": "1.0.5",
-      "resolved": "https://registry.npmjs.org/unicode-property-aliases-ecmascript/-/unicode-property-aliases-ecmascript-1.0.5.tgz",
-      "integrity": "sha512-L5RAqCfXqAwR3RriF8pM0lU0w4Ryf/GgzONwi6KnL1taJQa7x1TCxdJnILX59WIGOwR57IVxn7Nej0fz1Ny6fw==",
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/unicode-property-aliases-ecmascript/-/unicode-property-aliases-ecmascript-1.1.0.tgz",
+      "integrity": "sha512-PqSoPh/pWetQ2phoj5RLiaqIk4kCNwoV3CI+LfGmWLKI3rE3kl1h59XpX2BjgDrmbxD9ARtQobPGU1SguCYuQg==",
       "dev": true
     },
     "union-value": {
@@ -24166,15 +23962,14 @@
       "dev": true
     },
     "util": {
-      "version": "0.12.1",
-      "resolved": "https://registry.npmjs.org/util/-/util-0.12.1.tgz",
-      "integrity": "sha512-MREAtYOp+GTt9/+kwf00IYoHZyjM8VU4aVrkzUlejyqaIjd2GztVl5V9hGXKlvBKE3gENn/FMfHE5v6hElXGcQ==",
+      "version": "0.12.2",
+      "resolved": "https://registry.npmjs.org/util/-/util-0.12.2.tgz",
+      "integrity": "sha512-XE+MkWQvglYa+IOfBt5UFG93EmncEMP23UqpgDvVZVFBPxwmkK10QRp6pgU4xICPnWRf/t0zPv4noYSUq9gqUQ==",
       "dev": true,
       "requires": {
         "inherits": "^2.0.3",
         "is-arguments": "^1.0.4",
         "is-generator-function": "^1.0.7",
-        "object.entries": "^1.1.0",
         "safe-buffer": "^5.1.2"
       }
     },
diff --git a/package.json b/package.json
index 8a7e850a65..31d3427976 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,6 @@
   },
   "devDependencies": {
     "@polymer/gen-closure-declarations": "^0.5.0",
-    "@polymer/gen-typescript-declarations": "^1.5.1",
     "@polymer/iron-component-page": "^3.0.0-pre.12",
     "@polymer/test-fixture": "^3.0.0-pre.12",
     "@webcomponents/webcomponentsjs": "^2.2.10",
@@ -42,7 +41,7 @@
     "test": "npm run lint && polymer test --npm --module-resolution=node",
     "serve": "polymer serve --npm --module-resolution=node",
     "lint": "gulp lint",
-    "generate-types": "gen-typescript-declarations --outDir . --deleteExisting --verify && gulp generate-externs",
+    "generate-types": "gulp generate-externs",
     "regen-package-lock": "rm -rf node_modules package-lock.json; npm install",
     "prepare": "npm run generate-types"
   },
diff --git a/polymer-element.d.ts b/polymer-element.d.ts
new file mode 100644
index 0000000000..881b4af3d4
--- /dev/null
+++ b/polymer-element.d.ts
@@ -0,0 +1,17 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+
+import {ElementMixin} from './lib/mixins/element-mixin.js';
+
+export {html} from './lib/utils/html-tag.js';
+
+export {PolymerElement};
+
+/**
+ * Base class that provides the core API for Polymer's meta-programming
+ * features including template stamping, data-binding, attribute deserialization,
+ * and property change observation.
+ */
+declare class PolymerElement extends
+  ElementMixin(
+  HTMLElement) {
+}
diff --git a/polymer-legacy.d.ts b/polymer-legacy.d.ts
new file mode 100644
index 0000000000..77e5c127ec
--- /dev/null
+++ b/polymer-legacy.d.ts
@@ -0,0 +1,7 @@
+// tslint:disable:variable-name Describing an API that's defined elsewhere.
+
+import {LegacyElementMixin} from './lib/legacy/legacy-element-mixin.js';
+
+export {Polymer} from './lib/legacy/polymer-fn.js';
+
+export {html} from './lib/utils/html-tag.js';