Code refactoring for ember-runtime package

packages/ember-runtime/lib/computed/computed_macros.js

@@ -33,7 +33,7 @@ function expandPropertiesToArray(predicateName, properties) {
 }
 
 function generateComputedWithPredicate(name, predicate) {
-  return function(...properties) {
+  return (...properties) => {
     let expandedProperties = expandPropertiesToArray(name, properties);
 
     let computedFunc = computed(function() {
@@ -49,7 +49,7 @@ function generateComputedWithPredicate(name, predicate) {
       return get(this, expandedProperties[lastIdx]);
     });
 
-    return computedFunc.property.apply(computedFunc, expandedProperties);
+    return computedFunc.property(...expandedProperties);
   };
 }
 
@@ -82,7 +82,7 @@ function generateComputedWithPredicate(name, predicate) {
   @public
 */
 export function empty(dependentKey) {
-  return computed(dependentKey + '.length', function() {
+  return computed(`${dependentKey}.length`, function() {
     return isEmpty(get(this, dependentKey));
   });
 }
@@ -113,7 +113,7 @@ export function empty(dependentKey) {
   @public
 */
 export function notEmpty(dependentKey) {
-  return computed(dependentKey + '.length', function() {
+  return computed(`${dependentKey}.length`, function() {
     return !isEmpty(get(this, dependentKey));
   });
 }
@@ -460,9 +460,7 @@ export function lte(dependentKey, value) {
   a logical `and` on the values of all the original values for properties.
   @public
 */
-export let and = generateComputedWithPredicate('and', function(value) {
-  return value;
-});
+export let and = generateComputedWithPredicate('and', value => value);
 
 /**
   A computed property which performs a logical `or` on the
@@ -499,9 +497,7 @@ export let and = generateComputedWithPredicate('and', function(value) {
   a logical `or` on the values of all the original values for properties.
   @public
 */
-export let or = generateComputedWithPredicate('or', function(value) {
-  return !value;
-});
+export let or = generateComputedWithPredicate('or', value => !value);
 
 /**
   Creates a new property that is an alias for another property

packages/ember-runtime/lib/computed/reduce_computed_macros.js

@@ -688,7 +688,7 @@ function propertySort(itemsKey, sortPropertiesKey) {
     let activeObservers = activeObserversMap.get(this);
 
     if (activeObservers) {
-      activeObservers.forEach(args => removeObserver.apply(null, args));
+      activeObservers.forEach(args => removeObserver(...args));
     }
 
     function sortPropertyDidChange() {
@@ -698,7 +698,7 @@ function propertySort(itemsKey, sortPropertiesKey) {
     activeObservers = normalizedSortProperties.map(([prop]) => {
       let path = itemsKeyIsAtThis ? `@each.${prop}` : `${itemsKey}.@each.${prop}`;
       let args = [this, path, sortPropertyDidChange];
-      addObserver.apply(null, args);
+      addObserver(...args);
       return args;
     });
 

packages/ember-runtime/lib/ext/rsvp.js

@@ -33,7 +33,7 @@ function errorFor(reason) {
   }
 
   if (reason.name === 'UnrecognizedURLError') {
-    assert('The URL \'' + reason.message + '\' did not match any routes in your application', false);
+    assert(`The URL '${reason.message}' did not match any routes in your application`, false);
     return;
   }
 

packages/ember-runtime/lib/inject.js

@@ -33,9 +33,7 @@ const typeValidators = {};
 export function createInjectionHelper(type, validator) {
   typeValidators[type] = validator;
 
-  inject[type] = function(name) {
-    return new InjectedProperty(type, name);
-  };
+  inject[type] = name => new InjectedProperty(type, name);
 }
 
 /**

packages/ember-runtime/lib/mixins/-proxy.js

@@ -99,13 +99,13 @@ export default Mixin.create({
   _debugContainerKey: null,
 
   willWatchProperty(key) {
-    let contentKey = 'content.' + key;
+    let contentKey = `content.${key}`;
     _addBeforeObserver(this, contentKey, null, contentPropertyWillChange);
     addObserver(this, contentKey, null, contentPropertyDidChange);
   },
 
   didUnwatchProperty(key) {
-    let contentKey = 'content.' + key;
+    let contentKey = `content.${key}`;
     _removeBeforeObserver(this, contentKey, null, contentPropertyWillChange);
     removeObserver(this, contentKey, null, contentPropertyDidChange);
   },

packages/ember-runtime/lib/mixins/action_handler.js

@@ -184,7 +184,7 @@ const ActionHandler = Mixin.create({
     let target = get(this, 'target');
     if (target) {
       assert(
-        'The `target` for ' + this + ' (' + target + ') does not have a `send` method',
+        `The \`target\` for ${this} (${target}) does not have a \`send\` method`,
         typeof target.send === 'function'
       );
       target.send(...arguments);

packages/ember-runtime/lib/mixins/enumerable.js

@@ -396,7 +396,7 @@ const Enumerable = Mixin.create({
   filter(callback, target) {
     let ret = emberA();
 
-    this.forEach(function(x, idx, i) {
+    this.forEach((x, idx, i) => {
       if (callback.call(target, x, idx, i)) {
         ret.push(x);
       }
@@ -738,7 +738,7 @@ const Enumerable = Mixin.create({
   invoke(methodName, ...args) {
     let ret = emberA();
 
-    this.forEach(function(x, idx) {
+    this.forEach((x, idx) => {
       let method = x && x[methodName];
 
       if ('function' === typeof method) {

packages/ember-runtime/lib/mixins/freezable.js

@@ -68,7 +68,7 @@ import {
   @deprecated Use `Object.freeze` instead.
   @private
 */
-export var Freezable = Mixin.create({
+export const Freezable = Mixin.create({
 
   init() {
     deprecate(
@@ -108,4 +108,4 @@ export var Freezable = Mixin.create({
 
 });
 
-export var FROZEN_ERROR = 'Frozen object cannot be modified.';
+export const FROZEN_ERROR = 'Frozen object cannot be modified.';

packages/ember-runtime/lib/mixins/observable.js

@@ -158,7 +158,7 @@ export default Mixin.create({
     @public
   */
   getProperties(...args) {
-    return getProperties.apply(null, [this].concat(args));
+    return getProperties(...[this].concat(args));
   },
 
   /**
@@ -409,7 +409,7 @@ export default Mixin.create({
     @private
   */
   hasObserverFor(key) {
-    return hasListeners(this, key + ':change');
+    return hasListeners(this, `${key}:change`);
   },
 
   /**

packages/ember-runtime/lib/mixins/promise_proxy.js

@@ -29,7 +29,7 @@ function tap(proxy, promise) {
   }, reason => {
     if (!proxy.isDestroyed && !proxy.isDestroying) {
       setProperties(proxy, {
-        reason: reason,
+        reason,
         isRejected: true
       });
     }

packages/ember-runtime/lib/mixins/target_action_support.js

@@ -118,10 +118,10 @@ export default Mixin.create({
       let ret;
 
       if (target.send) {
-        ret = target.send.apply(target, args(actionContext, action));
+        ret = target.send(...args(actionContext, action));
       } else {
-        assert('The action \'' + action + '\' did not exist on ' + target, typeof target[action] === 'function');
-        ret = target[action].apply(target, args(actionContext));
+        assert(`The action '${action}' did not exist on ${target}`, typeof target[action] === 'function');
+        ret = target[action](...args(actionContext));
       }
 
       if (ret !== false) {

packages/ember-runtime/lib/system/array_proxy.js

@@ -265,7 +265,7 @@ export default EmberObject.extend(MutableArray, {
 
   _replace(idx, amt, objects) {
     let content = get(this, 'content');
-    assert('The content property of ' + this.constructor + ' should be set before modifying it', content);
+    assert(`The content property of ${this.constructor} should be set before modifying it`, content);
     if (content) {
       this.replaceContent(idx, amt, objects);
     }