Merge pull request #12 from Turbo87/remove-weakmap

Remove `ember-weakmap` dependency

addon/index.js

@@ -1,20 +1,19 @@
-import WeakMap from 'ember-weakmap';
 import Ember from 'ember';
 
 function isEqual(key, a, b) {
   return a === b;
 }
 
 export default Ember.Mixin.create({
-  _didChangeAttrsWeakMap: null, //this tracks previous state of any `trackAttrChanges`
+  _didChangeAttrsBuffer: null, //this tracks previous state of any `trackAttrChanges`
   didChangeAttrsConfig: [], //attributes to track
 
   didReceiveAttrs() {
     this._super(...arguments);
 
-    let weakMap = this.get('_didChangeAttrsWeakMap');
+    let buffer = this.get('_didChangeAttrsBuffer');
 
-    if (weakMap === null) { //first run
+    if (buffer === null) { //first run
       let config = this.get('didChangeAttrsConfig');
       let trackedAttrs = config.attrs;
       let initialValues = {};
@@ -24,9 +23,7 @@ export default Ember.Mixin.create({
         initialValues[key] = this.get(key);
       }
 
-      weakMap = new WeakMap();
-      weakMap.set(this, initialValues);
-      this.set('_didChangeAttrsWeakMap', weakMap);
+      this.set('_didChangeAttrsBuffer', initialValues);
     }
   },
 
@@ -37,7 +34,7 @@ export default Ember.Mixin.create({
     let equalityFn = config.isEqual || isEqual;
 
     let trackedAttrs = config.attrs;
-    let oldValues = this.get('_didChangeAttrsWeakMap').get(this);
+    let oldValues = this.get('_didChangeAttrsBuffer');
     let changes = {};
 
     for (let i=0; i<trackedAttrs.length; i++) {

package.json

@@ -18,8 +18,7 @@
     "test": "ember try:each"
   },
   "dependencies": {
-    "ember-cli-babel": "^6.6.0",
-    "ember-weakmap": "2.0.0"
+    "ember-cli-babel": "^6.6.0"
   },
   "devDependencies": {
     "broccoli-asset-rev": "^2.4.5",