diff --git a/.travis.yml b/.travis.yml
index f147e3ea95..f4a8d5e8e5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -20,7 +20,7 @@ before_script:
   update-types".' && false)
 script:
 - wct -l chrome
-- wct -l firefox
+- xvfb-run wct -l firefox
 - if [ "${TRAVIS_PULL_REQUEST}" = "false" ]; then travis_wait 30 ./util/travis-sauce-test.sh; fi
 env:
   global:
diff --git a/externs/closure-types.js b/externs/closure-types.js
index 62e86e785d..37f4a422b2 100644
--- a/externs/closure-types.js
+++ b/externs/closure-types.js
@@ -1412,4 +1412,22 @@ Polymer_DisableUpgradeMixin.prototype.connectedCallback = function(){};
 /**
 * @override
 */
-Polymer_DisableUpgradeMixin.prototype.disconnectedCallback = function(){};
\ No newline at end of file
+Polymer_DisableUpgradeMixin.prototype.disconnectedCallback = function(){};
+/**
+* @interface
+*/
+function Polymer_LegacyDataMixin(){}
+/**
+* @param {string} property Property that should trigger the effect
+* @param {string} type Effect type, from this.PROPERTY_EFFECT_TYPES
+* @param {Object=} effect Effect metadata object
+* @return {void}
+*/
+Polymer_LegacyDataMixin.prototype._addPropertyEffect = function(property, type, effect){};
+/**
+* @param {Object} templateInfo Template metadata to add effect to
+* @param {string} prop Property that should trigger the effect
+* @param {Object=} effect Effect metadata object
+* @return {void}
+*/
+Polymer_LegacyDataMixin._addTemplatePropertyEffect = function(templateInfo, prop, effect){};
\ No newline at end of file
diff --git a/lib/legacy/class.html b/lib/legacy/class.html
index 135cdd9999..617c856cb8 100644
--- a/lib/legacy/class.html
+++ b/lib/legacy/class.html
@@ -354,17 +354,21 @@
      *
      * @param {!PolymerInit} info Object containing Polymer metadata and functions
      *   to become class methods.
+     * @template T
+     * @param {function(T):T} mixin Optional mixin to apply to legacy base class
      * @return {function(new:HTMLElement)} Generated class
      * @memberof Polymer
      */
-    Polymer.Class = function(info) {
+    Polymer.Class = function(info, mixin) {
       if (!info) {
         console.warn('Polymer.Class requires `info` argument');
       }
-      let klass = GenerateClassFromInfo(info, info.behaviors ?
+      const baseWithBehaviors = info.behaviors ?
         // note: mixinBehaviors ensures `LegacyElementMixin`.
         mixinBehaviors(info.behaviors, HTMLElement) :
-        Polymer.LegacyElementMixin(HTMLElement));
+        Polymer.LegacyElementMixin(HTMLElement);
+      const baseWithMixin = mixin ? mixin(baseWithBehaviors) : baseWithBehaviors;
+      const klass = GenerateClassFromInfo(info, baseWithMixin);
       // decorate klass with registration info
       klass.is = info.is;
       return klass;
diff --git a/lib/legacy/legacy-data-mixin.html b/lib/legacy/legacy-data-mixin.html
new file mode 100644
index 0000000000..4e6bc06879
--- /dev/null
+++ b/lib/legacy/legacy-data-mixin.html
@@ -0,0 +1,171 @@
+<!--
+@license
+Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+-->
+
+<link rel="import" href="class.html">
+<link rel="import" href="../../polymer.html">
+<link rel="import" href="../utils/mixin.html">
+<link rel="import" href="../utils/templatize.html">
+
+<script>
+(function() {
+  'use strict';
+
+  const UndefinedArgumentError = class extends Error {
+    constructor(message, arg) {
+      super(message);
+      this.arg = arg;
+      this.name = this.constructor.name;
+      // Affordances for ensuring instanceof works after babel ES5 compilation
+      // TODO(kschaaf): Remove after polymer CLI updates to newer Babel that
+      // sets the constructor/prototype correctly for subclassed builtins
+      this.constructor = UndefinedArgumentError;
+      this.__proto__ = UndefinedArgumentError.prototype;
+    }
+  };
+
+  /**
+   * Wraps effect functions to catch `UndefinedArgumentError`s and warn.
+   * 
+   * @param {Object=} effect Effect metadata object
+   * @param {Object=} fnName Name of user function, if known
+   * @return {?Object} Effect metadata object
+   */
+  function wrapEffect(effect, fnName) {
+    if (effect && effect.fn) {
+      const fn = effect.fn;
+      effect.fn = function() {
+        try {
+          fn.apply(this, arguments);
+        } catch (e) {
+          if (e instanceof UndefinedArgumentError) {
+            console.warn(`Argument '${e.arg}'${fnName ?` for method '${fnName}'` : ''} was undefined. Ensure it has an undefined check.`);
+          } else {
+            throw e;
+          }
+        }
+      };
+    }
+    return effect;
+  }
+  
+  /**
+   * 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.
+   *
+   * @mixinFunction
+   * @polymer
+   * @summary Mixin to selectively add back Polymer 1.x's `undefined` rules
+   * governing when observers & computing functions run.
+   */
+  Polymer.LegacyDataMixin = Polymer.dedupingMixin(superClass => {
+
+    /**
+     * @polymer
+     * @mixinClass
+     * @implements {Polymer_LegacyDataMixin}
+     */
+    class LegacyDataMixin extends superClass {
+      /**
+       * Overrides `Polyer.PropertyEffects` to add `undefined` argument
+       * checking to match Polymer 1.x style rules
+       * 
+       * @param {!Array<!MethodArg>} args Array of argument metadata
+       * @param {string} path Property/path name that triggered the method effect
+       * @param {Object} props Bag of current property changes
+       * @return {Array<*>} Array of argument values
+       * @private
+       */
+      _marshalArgs(args, path, props) {
+        const vals = super._marshalArgs(args, path, props);
+        // Per legacy data rules, single-property observers (whether in `properties`
+        // and in `observers`) are called regardless of whether their argument is
+        // undefined or not. Multi-property observers must have all arguments defined
+        if (this._legacyUndefinedCheck && vals.length > 1) {
+          for (let i=0; i<vals.length; i++) {
+            if (vals[i] === undefined) {
+              // Break out of effect's control flow; will be caught in
+              // wrapped property effect function below
+              const name = args[i].name;
+              throw new UndefinedArgumentError(`Argument '${name}' is undefined. Ensure it has an undefined check.`, name);
+            }
+          }
+        }
+        return vals;
+      }
+
+      /**
+       * Overrides `Polyer.PropertyEffects` to wrap effect functions to
+       * catch `UndefinedArgumentError`s and warn.
+       * 
+       * @param {string} property Property that should trigger the effect
+       * @param {string} type Effect type, from this.PROPERTY_EFFECT_TYPES
+       * @param {Object=} effect Effect metadata object
+       * @return {void}
+       * @protected
+       */
+      _addPropertyEffect(property, type, effect) {
+        return super._addPropertyEffect(property, type,
+          wrapEffect(effect, effect && effect.info && effect.info.methodName));
+      }
+
+      /**
+       * Overrides `Polyer.PropertyEffects` to wrap effect functions to
+       * catch `UndefinedArgumentError`s and warn.
+       *
+       * @param {Object} templateInfo Template metadata to add effect to
+       * @param {string} prop Property that should trigger the effect
+       * @param {Object=} effect Effect metadata object
+       * @return {void}
+       * @protected
+       */
+      static _addTemplatePropertyEffect(templateInfo, prop, effect) {
+        return super._addTemplatePropertyEffect(templateInfo, prop, wrapEffect(effect));
+      }
+
+    }
+
+    return LegacyDataMixin;
+
+  });
+
+  // LegacyDataMixin is applied to base class _before_ metaprogramming, to
+  // ensure override of _addPropertyEffect et.al. are used by metaprogramming
+  // performed in _finalizeClass
+  const Class = Polymer.Class;
+  Polymer.Class = (info, mixin) => Class(info, 
+    superClass => mixin ? 
+      mixin(Polymer.LegacyDataMixin(superClass)) : 
+      Polymer.LegacyDataMixin(superClass)
+  );
+
+  // Apply LegacyDataMixin to Templatizer instances as well, and defer
+  // runtime switch to the root's host (_methodHost)
+  Polymer.Templatize.mixin = 
+    Polymer.dedupingMixin(superClass => class extends Polymer.LegacyDataMixin(superClass) {
+      get _legacyUndefinedCheck() {
+        return this._methodHost && this._methodHost._legacyUndefinedCheck;
+      }
+    });
+
+  console.info('LegacyDataMixin will be applied to all legacy elements.\n' +
+               'Set `_legacyUndefinedCheck: true` to enable.');
+
+})();
+</script>
diff --git a/lib/mixins/property-effects.html b/lib/mixins/property-effects.html
index fb83f48312..1d235548ef 100644
--- a/lib/mixins/property-effects.html
+++ b/lib/mixins/property-effects.html
@@ -814,7 +814,7 @@
     let context = inst._methodHost || inst;
     let fn = context[info.methodName];
     if (fn) {
-      let args = marshalArgs(inst.__data, info.args, property, props);
+      let args = inst._marshalArgs(info.args, property, props);
       return fn.apply(context, args);
     } else if (!info.dynamicFn) {
       console.warn('method `' + info.methodName + '` not defined');
@@ -970,56 +970,6 @@
     return a;
   }
 
-  /**
-   * Gather the argument values for a method specified in the provided array
-   * of argument metadata.
-   *
-   * The `path` and `value` arguments are used to fill in wildcard descriptor
-   * when the method is being called as a result of a path notification.
-   *
-   * @param {Object} data Instance data storage object to read properties from
-   * @param {!Array<!MethodArg>} args Array of argument metadata
-   * @param {string} path Property/path name that triggered the method effect
-   * @param {Object} props Bag of current property changes
-   * @return {Array<*>} Array of argument values
-   * @private
-   */
-  function marshalArgs(data, args, path, props) {
-    let values = [];
-    for (let i=0, l=args.length; i<l; i++) {
-      let arg = args[i];
-      let name = arg.name;
-      let v;
-      if (arg.literal) {
-        v = arg.value;
-      } else {
-        if (arg.structured) {
-          v = Polymer.Path.get(data, name);
-          // when data is not stored e.g. `splices`
-          if (v === undefined) {
-            v = props[name];
-          }
-        } else {
-          v = data[name];
-        }
-      }
-      if (arg.wildcard) {
-        // Only send the actual path changed info if the change that
-        // caused the observer to run matched the wildcard
-        let baseChanged = (name.indexOf(path + '.') === 0);
-        let matches = (path.indexOf(name) === 0 && !baseChanged);
-        values[i] = {
-          path: matches ? path : name,
-          value: matches ? props[path] : v,
-          base: v
-        };
-      } else {
-        values[i] = v;
-      }
-    }
-    return values;
-  }
-
   // data api
 
   /**
@@ -2181,6 +2131,56 @@
         createMethodEffect(this, sig, TYPES.COMPUTE, runComputedEffect, property, dynamicFn);
       }
 
+      /**
+       * Gather the argument values for a method specified in the provided array
+       * of argument metadata.
+       *
+       * The `path` and `value` arguments are used to fill in wildcard descriptor
+       * when the method is being called as a result of a path notification.
+       *
+       * @param {!Array<!MethodArg>} args Array of argument metadata
+       * @param {string} path Property/path name that triggered the method effect
+       * @param {Object} props Bag of current property changes
+       * @return {Array<*>} Array of argument values
+       * @private
+       */
+      _marshalArgs(args, path, props) {
+        const data = this.__data;
+        let values = [];
+        for (let i=0, l=args.length; i<l; i++) {
+          let arg = args[i];
+          let name = arg.name;
+          let v;
+          if (arg.literal) {
+            v = arg.value;
+          } else {
+            if (arg.structured) {
+              v = Polymer.Path.get(data, name);
+              // when data is not stored e.g. `splices`
+              if (v === undefined) {
+                v = props[name];
+              }
+            } else {
+              v = data[name];
+            }
+          }
+          if (arg.wildcard) {
+            // Only send the actual path changed info if the change that
+            // caused the observer to run matched the wildcard
+            let baseChanged = (name.indexOf(path + '.') === 0);
+            let matches = (path.indexOf(name) === 0 && !baseChanged);
+            values[i] = {
+              path: matches ? path : name,
+              value: matches ? props[path] : v,
+              base: v
+            };
+          } else {
+            values[i] = v;
+          }
+        }
+        return values;
+      }
+
       // -- static class methods ------------
 
       /**
diff --git a/lib/utils/templatize.html b/lib/utils/templatize.html
index 460a25530f..f8bd3d64fc 100644
--- a/lib/utils/templatize.html
+++ b/lib/utils/templatize.html
@@ -297,6 +297,10 @@
       // Anonymous class created by the templatize
       let base = options.mutableData ?
         MutableTemplateInstanceBase : TemplateInstanceBase;
+      // Affordance for global mixins onto TemplatizeInstance
+      if (Polymer.Templatize.mixin) {
+        base = Polymer.Templatize.mixin(base);
+      }
       /**
        * @constructor
        * @extends {base}
diff --git a/package-lock.json b/package-lock.json
index ebdd31f5fd..d827ae6c2e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,31 +14,164 @@
       }
     },
     "@babel/core": {
-      "version": "7.0.0-beta.54",
-      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.0.0-beta.54.tgz",
-      "integrity": "sha1-JTxU0AlUA6XPp2Tn2bRYGUaS0Cs=",
+      "version": "7.1.2",
+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.1.2.tgz",
+      "integrity": "sha512-IFeSSnjXdhDaoysIlev//UzHZbdEmm7D0EIH2qtse9xK7mXEZQpYjs2P00XlP1qYsYvid79p+Zgg6tz1mp6iVw==",
       "dev": true,
       "requires": {
-        "@babel/code-frame": "7.0.0-beta.54",
-        "@babel/generator": "7.0.0-beta.54",
-        "@babel/helpers": "7.0.0-beta.54",
-        "@babel/parser": "7.0.0-beta.54",
-        "@babel/template": "7.0.0-beta.54",
-        "@babel/traverse": "7.0.0-beta.54",
-        "@babel/types": "7.0.0-beta.54",
+        "@babel/code-frame": "^7.0.0",
+        "@babel/generator": "^7.1.2",
+        "@babel/helpers": "^7.1.2",
+        "@babel/parser": "^7.1.2",
+        "@babel/template": "^7.1.2",
+        "@babel/traverse": "^7.1.0",
+        "@babel/types": "^7.1.2",
         "convert-source-map": "^1.1.0",
         "debug": "^3.1.0",
         "json5": "^0.5.0",
-        "lodash": "^4.17.5",
+        "lodash": "^4.17.10",
         "resolve": "^1.3.2",
         "semver": "^5.4.1",
         "source-map": "^0.5.0"
       },
       "dependencies": {
+        "@babel/code-frame": {
+          "version": "7.0.0",
+          "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0.tgz",
+          "integrity": "sha512-OfC2uemaknXr87bdLUkWog7nYuliM9Ij5HUcajsVcMCpQrcLmtxRbVFTIqmcSkSeYRBFBRxs2FiUqFJDLdiebA==",
+          "dev": true,
+          "requires": {
+            "@babel/highlight": "^7.0.0"
+          }
+        },
+        "@babel/generator": {
+          "version": "7.1.3",
+          "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.1.3.tgz",
+          "integrity": "sha512-ZoCZGcfIJFJuZBqxcY9OjC1KW2lWK64qrX1o4UYL3yshVhwKFYgzpWZ0vvtGMNJdTlvkw0W+HR1VnYN8q3QPFQ==",
+          "dev": true,
+          "requires": {
+            "@babel/types": "^7.1.3",
+            "jsesc": "^2.5.1",
+            "lodash": "^4.17.10",
+            "source-map": "^0.5.0",
+            "trim-right": "^1.0.1"
+          }
+        },
+        "@babel/helper-function-name": {
+          "version": "7.1.0",
+          "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.1.0.tgz",
+          "integrity": "sha512-A95XEoCpb3TO+KZzJ4S/5uW5fNe26DjBGqf1o9ucyLyCmi1dXq/B3c8iaWTfBk3VvetUxl16e8tIrd5teOCfGw==",
+          "dev": true,
+          "requires": {
+            "@babel/helper-get-function-arity": "^7.0.0",
+            "@babel/template": "^7.1.0",
+            "@babel/types": "^7.0.0"
+          }
+        },
+        "@babel/helper-get-function-arity": {
+          "version": "7.0.0",
+          "resolved": "https://registry.npmjs.org/@babel/helper-get-function-arity/-/helper-get-function-arity-7.0.0.tgz",
+          "integrity": "sha512-r2DbJeg4svYvt3HOS74U4eWKsUAMRH01Z1ds1zx8KNTPtpTL5JAsdFv8BNyOpVqdFhHkkRDIg5B4AsxmkjAlmQ==",
+          "dev": true,
+          "requires": {
+            "@babel/types": "^7.0.0"
+          }
+        },
+        "@babel/helper-split-export-declaration": {
+          "version": "7.0.0",
+          "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.0.0.tgz",
+          "integrity": "sha512-MXkOJqva62dfC0w85mEf/LucPPS/1+04nmmRMPEBUB++hiiThQ2zPtX/mEWQ3mtzCEjIJvPY8nuwxXtQeQwUag==",
+          "dev": true,
+          "requires": {
+            "@babel/types": "^7.0.0"
+          }
+        },
+        "@babel/highlight": {
+          "version": "7.0.0",
+          "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.0.0.tgz",
+          "integrity": "sha512-UFMC4ZeFC48Tpvj7C8UgLvtkaUuovQX+5xNWrsIoMG8o2z+XFKjKaN9iVmS84dPwVN00W4wPmqvYoZF3EGAsfw==",
+          "dev": true,
+          "requires": {
+            "chalk": "^2.0.0",
+            "esutils": "^2.0.2",
+            "js-tokens": "^4.0.0"
+          }
+        },
+        "@babel/parser": {
+          "version": "7.1.3",
+          "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.1.3.tgz",
+          "integrity": "sha512-gqmspPZOMW3MIRb9HlrnbZHXI1/KHTOroBwN1NcLL6pWxzqzEKGvRTq0W/PxS45OtQGbaFikSQpkS5zbnsQm2w==",
+          "dev": true
+        },
+        "@babel/template": {
+          "version": "7.1.2",
+          "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.1.2.tgz",
+          "integrity": "sha512-SY1MmplssORfFiLDcOETrW7fCLl+PavlwMh92rrGcikQaRq4iWPVH0MpwPpY3etVMx6RnDjXtr6VZYr/IbP/Ag==",
+          "dev": true,
+          "requires": {
+            "@babel/code-frame": "^7.0.0",
+            "@babel/parser": "^7.1.2",
+            "@babel/types": "^7.1.2"
+          }
+        },
+        "@babel/traverse": {
+          "version": "7.1.4",
+          "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.1.4.tgz",
+          "integrity": "sha512-my9mdrAIGdDiSVBuMjpn/oXYpva0/EZwWL3sm3Wcy/AVWO2eXnsoZruOT9jOGNRXU8KbCIu5zsKnXcAJ6PcV6Q==",
+          "dev": true,
+          "requires": {
+            "@babel/code-frame": "^7.0.0",
+            "@babel/generator": "^7.1.3",
+            "@babel/helper-function-name": "^7.1.0",
+            "@babel/helper-split-export-declaration": "^7.0.0",
+            "@babel/parser": "^7.1.3",
+            "@babel/types": "^7.1.3",
+            "debug": "^3.1.0",
+            "globals": "^11.1.0",
+            "lodash": "^4.17.10"
+          }
+        },
+        "@babel/types": {
+          "version": "7.1.3",
+          "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.1.3.tgz",
+          "integrity": "sha512-RpPOVfK+yatXyn8n4PB1NW6k9qjinrXrRR8ugBN8fD6hCy5RXI6PSbVqpOJBO9oSaY7Nom4ohj35feb0UR9hSA==",
+          "dev": true,
+          "requires": {
+            "esutils": "^2.0.2",
+            "lodash": "^4.17.10",
+            "to-fast-properties": "^2.0.0"
+          }
+        },
+        "ansi-styles": {
+          "version": "3.2.1",
+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+          "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+          "dev": true,
+          "requires": {
+            "color-convert": "^1.9.0"
+          }
+        },
+        "chalk": {
+          "version": "2.4.1",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.1.tgz",
+          "integrity": "sha512-ObN6h1v2fTJSmUXoS3nMQ92LbDK9be4TV+6G+omQlGJFdcUX5heKi1LZ1YnRMIgwTLEj3E24bT6tYni50rlCfQ==",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^3.2.1",
+            "escape-string-regexp": "^1.0.5",
+            "supports-color": "^5.3.0"
+          }
+        },
+        "js-tokens": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
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-          "version": "9.6.23",
-          "resolved": "https://registry.npmjs.org/@types/node/-/node-9.6.23.tgz",
-          "integrity": "sha512-d2SJJpwkiPudEQ3+9ysANN2Nvz4QJKUPoe/WL5zyQzI0RaEeZWH5K5xjvUIGszTItHQpFPdH+u51f6G/LkS8Cg==",
-          "dev": true,
-          "optional": true
-        },
         "ansi-styles": {
           "version": "3.2.1",
           "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
@@ -12759,9 +14333,9 @@
           }
         },
         "supports-color": {
-          "version": "5.4.0",
-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.4.0.tgz",
-          "integrity": "sha512-zjaXglF5nnWpsq470jSv6P9DwPvgLkuapYmfDm3JWOm0vkNTVF2tI4UrN2r6jH1qM/uc/WtxYY1hYoA2dOKj5w==",
+          "version": "5.5.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
+          "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
           "dev": true,
           "optional": true,
           "requires": {
@@ -12771,9 +14345,9 @@
       }
     },
     "wct-sauce": {
-      "version": "2.0.3",
-      "resolved": "https://registry.npmjs.org/wct-sauce/-/wct-sauce-2.0.3.tgz",
-      "integrity": "sha512-vR+gdd1RJjK6+UaiduNYxxNneIFLAwkpO7FlJR045q0Hguavvax2NvSLw+XibQdE0khQxmjsXSM/rq1bk2tYmg==",
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/wct-sauce/-/wct-sauce-2.1.0.tgz",
+      "integrity": "sha512-c3R4PJcbpS7Gxv2vZ4HDAqpXV6cT9peslAWMU7hHH9PMhKDPbn8RNa6E4DVL0tOmZznB+3cRmtZ6+vJ/aDwu1A==",
       "dev": true,
       "optional": true,
       "requires": {
@@ -12809,9 +14383,9 @@
           }
         },
         "supports-color": {
-          "version": "5.4.0",
-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.4.0.tgz",
-          "integrity": "sha512-zjaXglF5nnWpsq470jSv6P9DwPvgLkuapYmfDm3JWOm0vkNTVF2tI4UrN2r6jH1qM/uc/WtxYY1hYoA2dOKj5w==",
+          "version": "5.5.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
+          "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
           "dev": true,
           "optional": true,
           "requires": {
@@ -12821,9 +14395,9 @@
       }
     },
     "wd": {
-      "version": "1.10.3",
-      "resolved": "https://registry.npmjs.org/wd/-/wd-1.10.3.tgz",
-      "integrity": "sha512-ffqqZDtFFLeg5u/4pw2vYKECW+z+vW6vc+7rcqF15uu1/rmw3BydV84BONNc9DIcQ5Z7gQFS/hAuMvj53eVtSg==",
+      "version": "1.11.0",
+      "resolved": "https://registry.npmjs.org/wd/-/wd-1.11.0.tgz",
+      "integrity": "sha512-h2EBfJvmsWocIjOOg5BsHh9IJKrqZDG4Az4jEZhFugEH7sOPcX6feZQ30aFuktqDI0jquarZJmNpA6V0A0Q7Mg==",
       "dev": true,
       "requires": {
         "archiver": "2.1.1",
@@ -12837,13 +14411,35 @@
       "dependencies": {
         "async": {
           "version": "2.0.1",
-          "resolved": "https://registry.npmjs.org/async/-/async-2.0.1.tgz",
+          "resolved": "http://registry.npmjs.org/async/-/async-2.0.1.tgz",
           "integrity": "sha1-twnMAoCpw28J9FNr6CPIOKkEniU=",
           "dev": true,
           "requires": {
             "lodash": "^4.8.0"
           }
         },
+        "har-validator": {
+          "version": "5.0.3",
+          "resolved": "https://registry.npmjs.org/har-validator/-/har-validator-5.0.3.tgz",
+          "integrity": "sha1-ukAsJmGU8VlW7xXg/PJCmT9qff0=",
+          "dev": true,
+          "requires": {
+            "ajv": "^5.1.0",
+            "har-schema": "^2.0.0"
+          }
+        },
+        "oauth-sign": {
+          "version": "0.8.2",
+          "resolved": "https://registry.npmjs.org/oauth-sign/-/oauth-sign-0.8.2.tgz",
+          "integrity": "sha1-Rqarfwrq2N6unsBWV4C31O/rnUM=",
+          "dev": true
+        },
+        "punycode": {
+          "version": "1.4.1",
+          "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.4.1.tgz",
+          "integrity": "sha1-wNWmOycYgArY4esPpSachN1BhF4=",
+          "dev": true
+        },
         "q": {
           "version": "1.4.1",
           "resolved": "https://registry.npmjs.org/q/-/q-1.4.1.tgz",
@@ -12852,7 +14448,7 @@
         },
         "request": {
           "version": "2.85.0",
-          "resolved": "https://registry.npmjs.org/request/-/request-2.85.0.tgz",
+          "resolved": "http://registry.npmjs.org/request/-/request-2.85.0.tgz",
           "integrity": "sha512-8H7Ehijd4js+s6wuVPLjwORxD4zeuyjYugprdOXlPSqaApmL/QOy+EB/beICHVCHkGMKNh5rvihb5ov+IDw4mg==",
           "dev": true,
           "requires": {
@@ -12879,13 +14475,22 @@
             "tunnel-agent": "^0.6.0",
             "uuid": "^3.1.0"
           }
+        },
+        "tough-cookie": {
+          "version": "2.3.4",
+          "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.3.4.tgz",
+          "integrity": "sha512-TZ6TTfI5NtZnuyy/Kecv+CnoROnyXn2DN97LontgQpCwsX2XyLYCC0ENhYkehSOwAp8rTQKc/NUIF7BkQ5rKLA==",
+          "dev": true,
+          "requires": {
+            "punycode": "^1.4.1"
+          }
         }
       }
     },
     "web-component-tester": {
-      "version": "6.7.1",
-      "resolved": "https://registry.npmjs.org/web-component-tester/-/web-component-tester-6.7.1.tgz",
-      "integrity": "sha512-i/N0MYLBh9fjzI4pcKvfYiTx4JEr+Zbt2m1/ANovpvT74El55WaiFyiwCdUGhnlX1xy1URGUB2CJgl6gdTBumg==",
+      "version": "6.9.0",
+      "resolved": "https://registry.npmjs.org/web-component-tester/-/web-component-tester-6.9.0.tgz",
+      "integrity": "sha512-l5KzzhlHJQ+I2qtVlo5cdUZdXenfb70mNJdHdOXc9YdgpUdkT1kQ9cRKWguaVpXQmphcpWjw8KOgkf5oUkafUw==",
       "dev": true,
       "requires": {
         "@polymer/sinonjs": "^1.14.1",
@@ -12895,7 +14500,6 @@
         "async": "^2.4.1",
         "body-parser": "^1.17.2",
         "bower-config": "^1.4.0",
-        "chai": "^4.0.2",
         "chalk": "^1.1.3",
         "cleankill": "^2.0.0",
         "express": "^4.15.3",
@@ -12904,7 +14508,7 @@
         "lodash": "^3.10.1",
         "multer": "^1.3.0",
         "nomnom": "^1.8.1",
-        "polyserve": "^0.27.11",
+        "polyserve": "^0.27.13",
         "resolve": "^1.5.0",
         "semver": "^5.3.0",
         "send": "^0.11.1",
@@ -12929,23 +14533,23 @@
           },
           "dependencies": {
             "lodash": {
-              "version": "4.17.10",
-              "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.10.tgz",
-              "integrity": "sha512-UejweD1pDoXu+AD825lWwp4ZGtSwgnpZxb3JDViD7StjQz+Nb/6l093lx4OQ0foGWNRoc19mWy7BzL+UAK2iVg==",
+              "version": "4.17.11",
+              "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.11.tgz",
+              "integrity": "sha512-cQKh8igo5QUhZ7lg38DYWAxMvjSAKG0A8wGSVimP07SIUEK2UO+arSRKbRZWtelMtN5V0Hkwh5ryOto/SshYIg==",
               "dev": true
             }
           }
         },
         "lodash": {
           "version": "3.10.1",
-          "resolved": "https://registry.npmjs.org/lodash/-/lodash-3.10.1.tgz",
+          "resolved": "http://registry.npmjs.org/lodash/-/lodash-3.10.1.tgz",
           "integrity": "sha1-W/Rejkm6QYnhfUgnid/RW9FAt7Y=",
           "dev": true
         },
         "semver": {
-          "version": "5.5.0",
-          "resolved": "https://registry.npmjs.org/semver/-/semver-5.5.0.tgz",
-          "integrity": "sha512-4SJ3dm0WAwWy/NVeioZh5AntkdJoWKxHxcmyP622fOkgHa4z3R0TdBJICINyaSDE6uNwVc8gZr+ZinwZAH4xIA==",
+          "version": "5.6.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.6.0.tgz",
+          "integrity": "sha512-RS9R6R35NYgQn++fkDWaOmqGoj4Ek9gGs+DPxNUZKuwE183xjJroKvyo1IzVFeXvUrvmALy6FWD5xrdJT25gMg==",
           "dev": true
         }
       }
@@ -12999,6 +14603,16 @@
         "stack-trace": "0.0.x"
       }
     },
+    "winston-transport": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/winston-transport/-/winston-transport-4.2.0.tgz",
+      "integrity": "sha512-0R1bvFqxSlK/ZKTH86nymOuKv/cT1PQBMuDdA7k7f0S9fM44dNH6bXnuxwXPrN8lefJgtZq08BKdyZ0DZIy/rg==",
+      "dev": true,
+      "requires": {
+        "readable-stream": "^2.3.6",
+        "triple-beam": "^1.2.0"
+      }
+    },
     "wordwrap": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
@@ -13060,7 +14674,7 @@
     },
     "xmlbuilder": {
       "version": "8.2.2",
-      "resolved": "https://registry.npmjs.org/xmlbuilder/-/xmlbuilder-8.2.2.tgz",
+      "resolved": "http://registry.npmjs.org/xmlbuilder/-/xmlbuilder-8.2.2.tgz",
       "integrity": "sha1-aSSGc0ELS6QuGmE2VR0pIjNap3M=",
       "dev": true,
       "optional": true
diff --git a/package.json b/package.json
index ed5ee6699b..9474674ba0 100644
--- a/package.json
+++ b/package.json
@@ -31,7 +31,7 @@
     "polymer-build": "^2.1.1",
     "run-sequence": "^2.2.0",
     "through2": "^2.0.0",
-    "web-component-tester": "^6.5.0"
+    "web-component-tester": "^6.9.0"
   },
   "scripts": {
     "build": "gulp",
diff --git a/test/runner.html b/test/runner.html
index 2752e1afb1..cde4c19032 100644
--- a/test/runner.html
+++ b/test/runner.html
@@ -79,7 +79,8 @@
       'unit/dir.html',
       'unit/disable-upgrade.html',
       'unit/shady-unscoped-style.html',
-      'unit/html-tag.html'
+      'unit/html-tag.html',
+      'unit/legacy-data.html'
       // 'unit/multi-style.html'
     ];
 
diff --git a/test/unit/globals.html b/test/unit/globals.html
index 45b1f1eb5c..73cbee94f7 100644
--- a/test/unit/globals.html
+++ b/test/unit/globals.html
@@ -85,7 +85,10 @@
     // weird safari + selenium globals
     alert: true,
     confirm: true,
-    prompt: true
+    prompt: true,
+
+    // weird FF globals
+    XULElement: true
   };
 
   test('check global leakage', function() {
diff --git a/test/unit/legacy-data.html b/test/unit/legacy-data.html
new file mode 100644
index 0000000000..8badb87d47
--- /dev/null
+++ b/test/unit/legacy-data.html
@@ -0,0 +1,436 @@
+<!doctype html>
+<!--
+@license
+Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+-->
+<html>
+<head>
+  <meta charset="utf-8">
+  <script src="../../../webcomponentsjs/webcomponents-lite.js"></script>
+  <script src="../../../web-component-tester/browser.js"></script>
+  <link rel="import" href="../../polymer.html">
+  <link rel="import" href="../../lib/legacy/legacy-data-mixin.html">
+</head>
+<body>
+
+  <dom-module id="x-data">
+    <template>
+      <div id="child"
+        computed-single="[[computeSingle(inlineSingleDep)]]"
+        computed-multi="[[computeMulti(inlineMultiDep1, inlineMultiDep2)]]">
+        <dom-if if>
+          <template><div id="ifChild" computed-multi="[[computeMulti(inlineMultiIfDep1, inlineMultiIfDep2)]]"></div></template>
+        </dom-if>
+      </div>
+    </template>
+    <script>
+      HTMLImports.whenReady(() => {
+        Polymer({
+          is: 'x-data',
+          _legacyUndefinedCheck: true,
+          properties: {
+            singleProp: String,
+            multiProp1: String,
+            multiProp2: String,
+            computedSingleDep: String,
+            computedMultiDep1: String,
+            computedMultiDep2: String,
+            inlineSingleDep: String,
+            inlineMultiDep1: String,
+            inlineMultiDep2: String,
+            inlineMultiIfDep1: String,
+            inlineMultiIfDep2: String,
+            computedSingle: {
+              computed: 'computeSingle(computedSingleDep)'
+            },
+            computedMulti: {
+              computed: 'computeMulti(computedMultiDep1, computedMultiDep2)'
+            }
+          },
+          observers: [
+            'staticObserver("staticObserver")',
+            'singlePropObserver(singleProp)',
+            'multiPropObserver(multiProp1, multiProp2)',
+            'throws(throwProp)'
+          ],
+          created() {
+            this.singlePropObserver = sinon.spy();
+            this.multiPropObserver = sinon.spy();
+            this.staticObserver = sinon.spy();
+            this.computeSingle = sinon.spy((inlineSingleDep) => `[${inlineSingleDep}]`);
+            this.computeMulti = sinon.spy((inlineMultiDep1, inlineMultiDep2) => `[${inlineMultiDep1},${inlineMultiDep2}]`);
+          },
+          throws() {
+            throw new Error('real error');
+          }
+        });
+      });
+    </script>
+  </dom-module>
+
+  <test-fixture id="declarative-none">
+    <template>
+      <x-data></x-data>
+    </template>
+  </test-fixture>
+  
+  <test-fixture id="declarative-single">
+    <template>
+      <x-data single-prop="a"></x-data>
+    </template>
+  </test-fixture>
+
+  <test-fixture id="declarative-multi-one">
+    <template>
+      <x-data multi-prop1="b"></x-data>
+    </template>
+  </test-fixture>
+
+  <test-fixture id="declarative-multi-all">
+    <template>
+      <x-data multi-prop1="b" multi-prop2="c"></x-data>
+    </template>
+  </test-fixture>
+
+  <test-fixture id="declarative-single-computed">
+    <template>
+      <x-data computed-single-dep="a"></x-data>
+    </template>
+  </test-fixture>
+
+  <test-fixture id="declarative-multi-one-computed">
+    <template>
+      <x-data computed-multi-dep1="b"></x-data>
+    </template>
+  </test-fixture>
+
+  <test-fixture id="declarative-multi-all-computed">
+    <template>
+      <x-data computed-multi-dep1="b" computed-multi-dep2="c"></x-data>
+    </template>
+  </test-fixture>
+
+  <test-fixture id="declarative-single-computed-inline">
+    <template>
+      <x-data inline-single-dep="a"></x-data>
+    </template>
+  </test-fixture>
+
+  <test-fixture id="declarative-multi-one-computed-inline">
+    <template>
+      <x-data inline-multi-dep1="b"></x-data>
+    </template>
+  </test-fixture>
+
+  <test-fixture id="declarative-multi-all-computed-inline">
+    <template>
+      <x-data inline-multi-dep1="b" inline-multi-dep2="c"></x-data>
+    </template>
+  </test-fixture>
+
+  <test-fixture id="declarative-multi-if-one-computed-inline">
+    <template>
+      <x-data inline-multi-if-dep1="b"></x-data>
+    </template>
+  </test-fixture>
+
+  <test-fixture id="declarative-multi-if-all-computed-inline">
+    <template>
+      <x-data inline-multi-if-dep1="b" inline-multi-if-dep2="c"></x-data>
+    </template>
+  </test-fixture>
+
+  <script>
+  (function() {
+
+    let el;
+
+    function assertEffects(callCounts) {
+      assert.equal(el.staticObserver.callCount, 1, 'staticObserver call count wrong');
+      assert.equal(el.singlePropObserver.callCount, 
+        callCounts.singlePropObserver || 0, 'singlePropObserver call count wrong');
+      assert.equal(el.multiPropObserver.callCount,
+        callCounts.multiPropObserver || 0, 'multiPropObserver call count wrong');
+      assert.equal(el.computeSingle.callCount,
+        callCounts.computeSingle || 0, 'computeSingle call count wrong');
+      assert.equal(el.computeMulti.callCount,
+        callCounts.computeMulti || 0, 'computeMulti call count wrong');
+      assert.equal(console.warn.callCount, callCounts.warn || 0,
+        'console.warn call count wrong');
+    }
+
+    suite('imperative', () => {
+
+      setup(() => sinon.spy(console, 'warn'));
+      
+      function setupElement(check, props) {
+        el = document.createElement('x-data');
+        el._legacyUndefinedCheck = check;
+        Object.assign(el, props);
+        document.body.appendChild(el);
+        Polymer.flush();
+      }
+
+      teardown(() => {
+        console.warn.restore();
+        el.parentNode.removeChild(el);
+      });
+
+      const singleProp = 'singleProp';
+      const multiProp1 = 'multiProp1';
+      const multiProp2 = 'multiProp2';
+      const computedSingleDep = 'computedSingleDep';
+      const computedMultiDep1 = 'computedMultiDep1';
+      const computedMultiDep2 = 'computedMultiDep2';
+      const inlineSingleDep = 'inlineSingleDep';
+      const inlineMultiDep1 = 'inlineMultiDep1';
+      const inlineMultiDep2 = 'inlineMultiDep2';
+      const inlineMultiIfDep1 = 'inlineMultiIfDep1';
+      const inlineMultiIfDep2 = 'inlineMultiIfDep2';
+
+      suite('check disabled', () => {
+        test('no arguments defined', () => {
+          setupElement(false, {});
+          assertEffects({});
+        });
+        test('singlePropObserver argument defined', () => {
+          setupElement(false, {singleProp});
+          assertEffects({singlePropObserver: 1});
+        });
+        test('one multiPropObserver arguments defined', () => {
+          setupElement(false, {multiProp1});
+          assertEffects({multiPropObserver: 1});
+        });
+        test('all multiPropObserver defined', () => {
+          setupElement(false, {multiProp1, multiProp2});
+          assertEffects({multiPropObserver: 1});
+        });
+        test('singlePropObserver argument undefined', () => {
+          setupElement(false, {singleProp});
+          assertEffects({singlePropObserver: 1});
+          el.singleProp = undefined;
+          assertEffects({singlePropObserver: 2});
+        });
+        test('one multiPropObserver arguments undefined', () => {
+          setupElement(false, {multiProp1, multiProp2});
+          assertEffects({multiPropObserver: 1});
+          el.multiProp1 = undefined;
+          assertEffects({multiPropObserver: 2});
+        });
+        test('all multiPropObserver undefined', () => {
+          setupElement(false, {multiProp1, multiProp2});
+          assertEffects({multiPropObserver: 1});
+          el.multiProp1 = undefined;
+          assertEffects({multiPropObserver: 2});
+          el.multiProp2 = undefined;
+          assertEffects({multiPropObserver: 3});
+        });
+        test('computeSingle argument defined', () => {
+          setupElement(false, {computedSingleDep});
+          assertEffects({computeSingle: 1});
+          assert.equal(el.computedSingle, '[computedSingleDep]');
+        });
+        test('one computeMulti argument defined', () => {
+          setupElement(false, {computedMultiDep1});
+          assertEffects({computeMulti: 1});
+          assert.equal(el.computedMulti, '[computedMultiDep1,undefined]');
+        });
+        test('all computeMulti argument defined', () => {
+          setupElement(false, {computedMultiDep1, computedMultiDep2});
+          assertEffects({computeMulti: 1});
+          assert.equal(el.computedMulti, '[computedMultiDep1,computedMultiDep2]');
+        });
+        test('inline computeSingle argument defined', () => {
+          setupElement(false, {inlineSingleDep});
+          assertEffects({computeSingle: 1});
+          assert.equal(el.$.child.computedSingle, '[inlineSingleDep]');
+        });
+        test('one inline computeMulti argument defined', () => {
+          setupElement(false, {inlineMultiDep1});
+          assertEffects({computeMulti: 1});
+          assert.equal(el.$.child.computedMulti, '[inlineMultiDep1,undefined]');
+        });
+        test('all inline computeMulti argument defined', () => {
+          setupElement(false, {inlineMultiDep1, inlineMultiDep2});
+          assertEffects({computeMulti: 1});
+          assert.equal(el.$.child.computedMulti, '[inlineMultiDep1,inlineMultiDep2]');
+        });
+        test('one inline computeMulti argument defined in dom-if', () => {
+          setupElement(false, {inlineMultiIfDep1});
+          assertEffects({computeMulti: 1});
+          assert.equal(el.$$('#ifChild').computedMulti, '[inlineMultiIfDep1,undefined]');
+        });
+        test('all inline computeMulti argument defined in dom-if', () => {
+          setupElement(false, {inlineMultiIfDep1, inlineMultiIfDep2});
+          assertEffects({computeMulti: 1});
+          assert.equal(el.$$('#ifChild').computedMulti, '[inlineMultiIfDep1,inlineMultiIfDep2]');
+        });
+      });
+
+      suite('warn', () => {
+        test('no arguments defined', () => {
+          setupElement(true, {});
+          assertEffects({});
+        });
+        test('singlePropObserver argument defined', () => {
+          setupElement(true, {singleProp});
+          assertEffects({singlePropObserver: 1});
+        });
+        test('one multiPropObserver arguments defined', () => {
+          setupElement(true, {multiProp1});
+          assertEffects({multiPropObserver: 0, warn: 1});
+        });
+        test('all multiPropObserver defined', () => {
+          setupElement(true, {multiProp1, multiProp2});
+          assertEffects({multiPropObserver: 1});
+        });
+        test('singlePropObserver argument undefined', () => {
+          setupElement(true, {singleProp});
+          assertEffects({singlePropObserver: 1});
+          el.singleProp = undefined;
+          assertEffects({singlePropObserver: 2});
+        });
+        test('one multiPropObserver arguments undefined', () => {
+          setupElement(true, {multiProp1, multiProp2});
+          assertEffects({multiPropObserver: 1});
+          el.multiProp1 = undefined;
+          assertEffects({multiPropObserver: 1, warn: 1});
+        });
+        test('all multiPropObserver undefined', () => {
+          setupElement(true, {multiProp1, multiProp2});
+          assertEffects({multiPropObserver: 1});
+          el.multiProp1 = undefined;
+          assertEffects({multiPropObserver: 1, warn: 1});
+          el.multiProp2 = undefined;
+          assertEffects({multiPropObserver: 1, warn: 2});
+        });
+        test('computeSingle argument defined', () => {
+          setupElement(true, {computedSingleDep});
+          assertEffects({computeSingle: 1});
+          assert.equal(el.computedSingle, '[computedSingleDep]');
+        });
+        test('one computeMulti argument defined', () => {
+          setupElement(true, {computedMultiDep1});
+          assertEffects({warn: 1});
+          assert.equal(el.computedMulti, undefined);
+        });
+        test('all computeMulti argument defined', () => {
+          setupElement(true, {computedMultiDep1, computedMultiDep2});
+          assertEffects({computeMulti: 1});
+          assert.equal(el.computedMulti, '[computedMultiDep1,computedMultiDep2]');
+        });
+        test('inline computeSingle argument defined', () => {
+          setupElement(true, {inlineSingleDep});
+          assertEffects({computeSingle: 1});
+          assert.equal(el.$.child.computedSingle, '[inlineSingleDep]');
+        });
+        test('one inline computeMulti argument defined', () => {
+          setupElement(true, {inlineMultiDep1});
+          assertEffects({warn: 1});
+          assert.equal(el.$.child.computedMulti, undefined);
+        });
+        test('all inline computeMulti argument defined', () => {
+          setupElement(true, {inlineMultiDep1, inlineMultiDep2});
+          assertEffects({computeMulti: 1});
+          assert.equal(el.$.child.computedMulti, '[inlineMultiDep1,inlineMultiDep2]');
+        });
+        test('one inline computeMulti argument defined in dom-if', () => {
+          setupElement(true, {inlineMultiIfDep1});
+          assertEffects({warn: 1});
+          assert.equal(el.$$('#ifChild').computedMulti, undefined);
+        });
+        test('all inline computeMulti argument defined in dom-if', () => {
+          setupElement(true, {inlineMultiIfDep1, inlineMultiIfDep2});
+          assertEffects({computeMulti: 1});
+          assert.equal(el.$$('#ifChild').computedMulti, '[inlineMultiIfDep1,inlineMultiIfDep2]');
+        });
+      });
+    });
+
+    suite('declarative', () => {
+
+      setup(() => sinon.spy(console, 'warn'));
+
+      teardown(() => console.warn.restore());
+
+      suite('warn', () => {
+        test('no arguments defined', () => {
+          el = fixture('declarative-none');
+          assertEffects({});
+        });
+        test('singlePropObserver argument defined', () => {
+          el = fixture('declarative-single');
+          assertEffects({singlePropObserver: 1});
+        });
+        test('one multiPropObserver arguments defined', () => {
+          el = fixture('declarative-multi-one');
+          assertEffects({multiPropObserver: 0, warn: 1});
+        });
+        test('all multiPropObserver defined', () => {
+          el = fixture('declarative-multi-all');
+          assertEffects({multiPropObserver: 1});
+        });
+        test('computeSingle argument defined', () => {
+          el = fixture('declarative-single-computed');
+          assertEffects({computeSingle: 1});
+          assert.equal(el.computedSingle, '[a]');
+        });
+        test('one computeMulti arguments defined', () => {
+          el = fixture('declarative-multi-one-computed');
+          assertEffects({computeMulti: 0, warn: 1});
+          assert.equal(el.computedMulti, undefined);
+        });
+        test('all computeMulti defined', () => {
+          el = fixture('declarative-multi-all-computed');
+          assert.equal(el.computedMulti, '[b,c]');
+        });
+        test('inline computeSingle argument defined', () => {
+          el = fixture('declarative-single-computed-inline');
+          assertEffects({computeSingle: 1});
+          assert.equal(el.$.child.computedSingle, '[a]');
+        });
+        test('inline one computeMulti arguments defined', () => {
+          el = fixture('declarative-multi-one-computed-inline');
+          assertEffects({computeMulti: 0, warn: 1});
+          assert.equal(el.$.child.computedMulti, undefined);
+        });
+        test('inline all computeMulti defined', () => {
+          el = fixture('declarative-multi-all-computed-inline');
+          assertEffects({computeMulti: 1});
+          assert.equal(el.$.child.computedMulti, '[b,c]');
+        });
+        test('one inline computeMulti argument defined in dom-if', () => {
+          el = fixture('declarative-multi-if-one-computed-inline');
+          Polymer.flush();
+          assertEffects({computeMulti: 0, warn: 1});
+          assert.equal(el.$$('#ifChild').computedMulti, undefined);
+        });
+        test('all inline computeMulti argument defined in dom-if', () => {
+          el = fixture('declarative-multi-if-all-computed-inline');
+          Polymer.flush();
+          assertEffects({computeMulti: 1});
+          assert.equal(el.$$('#ifChild').computedMulti, '[b,c]');
+        });
+      });
+    });
+
+    suite('other', () => {
+      test('real errors still throw', () => {
+        const el = document.createElement('x-data');
+        document.body.appendChild(el);
+        assert.throws(() => {
+          el.throwProp = true;
+        }, /real error/);
+        document.body.removeChild(el);
+      });
+    });
+    
+  })();
+  </script>
+</body>
+</html>
diff --git a/types/lib/legacy/class.d.ts b/types/lib/legacy/class.d.ts
index fe4124a07f..64f3a79ad7 100644
--- a/types/lib/legacy/class.d.ts
+++ b/types/lib/legacy/class.d.ts
@@ -91,5 +91,5 @@ declare namespace Polymer {
    *
    * @returns Generated class
    */
-  function Class(info: PolymerInit): {new(): HTMLElement};
+  function Class<T>(info: PolymerInit, mixin: (p0: T) => T): {new(): HTMLElement};
 }
diff --git a/types/lib/legacy/legacy-data-mixin.d.ts b/types/lib/legacy/legacy-data-mixin.d.ts
new file mode 100644
index 0000000000..3c2305e4ee
--- /dev/null
+++ b/types/lib/legacy/legacy-data-mixin.d.ts
@@ -0,0 +1,89 @@
+/**
+ * DO NOT EDIT
+ *
+ * This file was automatically generated by
+ *   https://github.com/Polymer/gen-typescript-declarations
+ *
+ * To modify these typings, edit the source file(s):
+ *   lib/legacy/legacy-data-mixin.html
+ */
+
+/// <reference path="class.d.ts" />
+/// <reference path="../../polymer.d.ts" />
+/// <reference path="../utils/mixin.d.ts" />
+/// <reference path="../utils/templatize.d.ts" />
+
+declare class UndefinedArgumentError extends Error {
+  constructor(message: any, arg: any);
+}
+
+declare namespace Polymer {
+
+
+  /**
+   * 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.
+   */
+  function LegacyDataMixin<T extends new (...args: any[]) => {}>(base: T): T & LegacyDataMixinConstructor;
+
+  interface LegacyDataMixinConstructor {
+    new(...args: any[]): LegacyDataMixin;
+
+    /**
+     * Overrides `Polyer.PropertyEffects` to wrap effect functions to
+     * catch `UndefinedArgumentError`s and warn.
+     *
+     * @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;
+  }
+
+  interface LegacyDataMixin {
+    readonly _legacyUndefinedCheck: any;
+
+    /**
+     * Overrides `Polyer.PropertyEffects` to wrap effect functions to
+     * catch `UndefinedArgumentError`s and warn.
+     *
+     * @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;
+  }
+}
+
+declare class LegacyDataMixin extends superClass {
+
+  /**
+   * Overrides `Polyer.PropertyEffects` to wrap effect functions to
+   * catch `UndefinedArgumentError`s and warn.
+   *
+   * @param templateInfo Template metadata to add effect to
+   * @param prop Property that should trigger the effect
+   * @param effect Effect metadata object
+   */
+  static _addTemplatePropertyEffect(templateInfo: object|null, prop: string, effect?: object|null): void;
+
+  /**
+   * Overrides `Polyer.PropertyEffects` to wrap effect functions to
+   * catch `UndefinedArgumentError`s and warn.
+   *
+   * @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;
+}
diff --git a/util/travis-sauce-test.sh b/util/travis-sauce-test.sh
index 7d760f075b..ffd1487a3d 100755
--- a/util/travis-sauce-test.sh
+++ b/util/travis-sauce-test.sh
@@ -9,4 +9,4 @@
 # subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 #
 set -x
-wct -s 'windows 10/microsoftedge@14' -s 'windows 10/microsoftedge@15' -s 'windows 10/microsoftedge@16' -s 'windows 8.1/internet explorer@11' -s 'os x 10.11/safari@9' -s 'macos 10.12/safari@10' -s 'macos 10.13/safari@11' -s 'Linux/chrome@41'
\ No newline at end of file
+wct -s 'windows 10/microsoftedge@15' -s 'windows 10/microsoftedge@17' -s 'windows 8.1/internet explorer@11' -s 'os x 10.11/safari@9' -s 'macos 10.13/safari@11' -s 'macos 10.13/safari@12' -s 'Linux/chrome@41' -s 'windows/firefox@62'
\ No newline at end of file
diff --git a/wct.conf.json b/wct.conf.json
index 5b315d7362..8c061cea55 100644
--- a/wct.conf.json
+++ b/wct.conf.json
@@ -10,9 +10,6 @@
           "headless",
           "disable-gpu",
           "no-sandbox"
-        ],
-        "firefox": [
-          "-headless"
         ]
       }
     }