Closure typing fixes

Author: dfreedm

lib/legacy/polymer.dom.js

@@ -40,8 +40,9 @@ export const matchesSelector = function(node, selector) {
  * Node API wrapper class returned from `Polymer.dom.(target)` when
  * `target` is a `Node`.
  * @implements {PolymerDomApi}
+ * @unrestricted
  */
-export let DomApi = class {
+class DomApi {
 
   /**
    * @param {Node} node Node for which to create a Polymer.dom helper object.
@@ -377,10 +378,14 @@ DomApi.prototype.textContent;
 /** @type {string} */
 DomApi.prototype.innerHTML;
 
+let DomApiImpl = DomApi;
 
 if (window['ShadyDOM'] && window['ShadyDOM']['inUse'] && window['ShadyDOM']['noPatch'] && window['ShadyDOM']['Wrapper']) {
 
-  /** @private */
+  /**
+   * @private
+   * @extends {HTMLElement}
+   */
   class Wrapper extends window['ShadyDOM']['Wrapper'] {}
 
   // copy bespoke API onto wrapper
@@ -390,7 +395,7 @@ if (window['ShadyDOM'] && window['ShadyDOM']['inUse'] && window['ShadyDOM']['noP
     }
   });
 
-  DomApi = Wrapper;
+  DomApiImpl = Wrapper;
 
   Object.defineProperties(EventApi.prototype, {
 
@@ -429,6 +434,8 @@ if (window['ShadyDOM'] && window['ShadyDOM']['inUse'] && window['ShadyDOM']['noP
   ]);
 }
 
+export {DomApiImpl as DomApi};
+
 /**
  * Legacy DOM and Event manipulation API wrapper factory used to abstract
  * differences between native Shadow DOM and "Shady DOM" when polyfilling on
@@ -440,20 +447,23 @@ if (window['ShadyDOM'] && window['ShadyDOM']['inUse'] && window['ShadyDOM']['noP
  *
  * @summary Legacy DOM and Event manipulation API wrapper factory used to
  * abstract differences between native Shadow DOM and "Shady DOM."
- * @param {(Node|Event)=} obj Node or event to operate on
+ * @param {(Node|Event|DomApi|EventApi)=} obj Node or event to operate on
  * @return {!DomApi|!EventApi} Wrapper providing either node API or event API
  */
 export const dom = function(obj) {
   obj = obj || document;
-  if (obj instanceof DomApi || obj instanceof EventApi) {
-    return obj;
+  if (obj instanceof DomApiImpl) {
+    return /** @type {!DomApi} */(obj);
+  }
+  if (obj instanceof EventApi) {
+    return /** @type {!EventApi} */(obj);
   }
   let helper = obj['__domApi'];
   if (!helper) {
     if (obj instanceof Event) {
       helper = new EventApi(obj);
     } else {
-      helper = new DomApi(obj);
+      helper = new DomApi(/** @type {Node} */(obj));
     }
     obj['__domApi'] = helper;
   }