[react-packager] Modernize Activity to ES6

react-packager/src/Activity/__mocks__/chalk.js

@@ -9,5 +9,5 @@
 'use strict';
 
 module.exports = {
-  dim: function(s) { return s; },
+  dim: s =>  s,
 };

react-packager/src/Activity/__tests__/Activity-test.js

@@ -10,64 +10,63 @@
 
 jest.autoMockOff();
 
-describe('Activity', function() {
-  var Activity;
+describe('Activity', () => {
+  const origConsoleLog = console.log;
+  let Activity;
 
-  var origConsoleLog = console.log;
-
-  beforeEach(function() {
+  beforeEach(() => {
     console.log = jest.genMockFn();
     Activity = require('../');
     jest.runOnlyPendingTimers();
   });
 
-  afterEach(function() {
+  afterEach(() => {
     console.log = origConsoleLog;
   });
 
-  describe('startEvent', function() {
-    it('writes a START event out to the console', function() {
-      var EVENT_NAME = 'EVENT_NAME';
-      var DATA = {someData: 42};
+  describe('startEvent', () => {
+    it('writes a START event out to the console', () => {
+      const EVENT_NAME = 'EVENT_NAME';
+      const DATA = {someData: 42};
 
       Activity.startEvent(EVENT_NAME, DATA);
       jest.runOnlyPendingTimers();
 
       expect(console.log.mock.calls.length).toBe(1);
-      var consoleMsg = console.log.mock.calls[0][0];
+      const consoleMsg = console.log.mock.calls[0][0];
       expect(consoleMsg).toContain('START');
       expect(consoleMsg).toContain(EVENT_NAME);
       expect(consoleMsg).toContain(JSON.stringify(DATA));
     });
   });
 
-  describe('endEvent', function() {
-    it('writes an END event out to the console', function() {
-      var EVENT_NAME = 'EVENT_NAME';
-      var DATA = {someData: 42};
+  describe('endEvent', () => {
+    it('writes an END event out to the console', () => {
+      const EVENT_NAME = 'EVENT_NAME';
+      const DATA = {someData: 42};
 
-      var eventID = Activity.startEvent(EVENT_NAME, DATA);
+      const eventID = Activity.startEvent(EVENT_NAME, DATA);
       Activity.endEvent(eventID);
       jest.runOnlyPendingTimers();
 
       expect(console.log.mock.calls.length).toBe(2);
-      var consoleMsg = console.log.mock.calls[1][0];
+      const consoleMsg = console.log.mock.calls[1][0];
       expect(consoleMsg).toContain('END');
       expect(consoleMsg).toContain(EVENT_NAME);
       expect(consoleMsg).toContain(JSON.stringify(DATA));
     });
 
-    it('throws when called with an invalid eventId', function() {
-      expect(function() {
-        Activity.endEvent(42);
-      }).toThrow('event(42) is not a valid event id!');
+    it('throws when called with an invalid eventId', () => {
+      expect(() => Activity.endEvent(42)).toThrow(
+        'event(42) is not a valid event id!',
+      );
     });
 
-    it('throws when called with an expired eventId', function() {
-      var eid = Activity.startEvent('', '');
+    it('throws when called with an expired eventId', () => {
+      const eid = Activity.startEvent('', '');
       Activity.endEvent(eid);
 
-      expect(function() {
+      expect(() => {
         Activity.endEvent(eid);
       }).toThrow('event(3) has already ended!');
 
@@ -75,17 +74,16 @@ describe('Activity', function() {
     });
   });
 
-  describe('signal', function() {
-    it('writes a SIGNAL event out to the console', function() {
-
-      var EVENT_NAME = 'EVENT_NAME';
-      var DATA = {someData: 42};
+  describe('signal', () => {
+    it('writes a SIGNAL event out to the console', () => {
+      const EVENT_NAME = 'EVENT_NAME';
+      const DATA = {someData: 42};
 
       Activity.signal(EVENT_NAME, DATA);
       jest.runOnlyPendingTimers();
 
       expect(console.log.mock.calls.length).toBe(1);
-      var consoleMsg = console.log.mock.calls[0][0];
+      const consoleMsg = console.log.mock.calls[0][0];
       expect(consoleMsg).toContain(EVENT_NAME);
       expect(consoleMsg).toContain(JSON.stringify(DATA));
     });

react-packager/src/Activity/index.js

@@ -8,21 +8,22 @@
  */
 'use strict';
 
-var chalk = require('chalk');
-var events = require('events');
+const chalk = require('chalk');
+const events = require('events');
 
-var COLLECTION_PERIOD = 1000;
+const COLLECTION_PERIOD = 1000;
 
-var _endedEvents = Object.create(null);
-var _eventStarts = Object.create(null);
-var _queuedActions = [];
-var _scheduledCollectionTimer = null;
-var _uuid = 1;
-var _enabled = true;
-var _eventEmitter = new events.EventEmitter();
+const _endedEvents = Object.create(null);
+const _eventStarts = Object.create(null);
+const _queuedActions = [];
+const _eventEmitter = new events.EventEmitter();
+
+let _scheduledCollectionTimer = null;
+let _uuid = 1;
+let _enabled = true;
 
 function endEvent(eventId) {
-  var eventEndTime = Date.now();
+  const eventEndTime = Date.now();
 
   if (!_eventStarts[eventId]) {
     _throw('event(' + eventId + ') is not a valid event id!');
@@ -41,7 +42,7 @@ function endEvent(eventId) {
 }
 
 function signal(eventName, data) {
-  var signalTime = Date.now();
+  const signalTime = Date.now();
 
   if (eventName == null) {
     _throw('No event name specified');
@@ -60,7 +61,7 @@ function signal(eventName, data) {
 }
 
 function startEvent(eventName, data) {
-  var eventStartTime = Date.now();
+  const eventStartTime = Date.now();
 
   if (eventName == null) {
     _throw('No event name specified');
@@ -70,8 +71,8 @@ function startEvent(eventName, data) {
     data = null;
   }
 
-  var eventId = _uuid++;
-  var action = {
+  const eventId = _uuid++;
+  const action = {
     action: 'startEvent',
     data: data,
     eventId: eventId,
@@ -90,7 +91,7 @@ function disable() {
 
 function _runCollection() {
   /* jshint -W084 */
-  var action;
+  let action;
   while ((action = _queuedActions.shift())) {
     _writeAction(action);
   }
@@ -117,10 +118,10 @@ function _scheduleAction(action) {
  *  won't be adding such a non-trivial optimization anytime soon)
  */
 function _throw(msg) {
-  var err = new Error(msg);
+  const err = new Error(msg);
 
   // Strip off the call to _throw()
-  var stack = err.stack.split('\n');
+  const stack = err.stack.split('\n');
   stack.splice(1, 1);
   err.stack = stack.join('\n');
 
@@ -132,8 +133,8 @@ function _writeAction(action) {
     return;
   }
 
-  var data = action.data ? ': ' + JSON.stringify(action.data) : '';
-  var fmtTime = new Date(action.tstamp).toLocaleTimeString();
+  const data = action.data ? ': ' + JSON.stringify(action.data) : '';
+  const fmtTime = new Date(action.tstamp).toLocaleTimeString();
 
   switch (action.action) {
     case 'startEvent':
@@ -145,8 +146,8 @@ function _writeAction(action) {
       break;
 
     case 'endEvent':
-      var startAction = _eventStarts[action.eventId];
-      var startData = startAction.data ? ': ' + JSON.stringify(startAction.data) : '';
+      const startAction = _eventStarts[action.eventId];
+      const startData = startAction.data ? ': ' + JSON.stringify(startAction.data) : '';
       console.log(chalk.dim(
         '[' + fmtTime + '] ' +
         '<END>   ' + startAction.eventName +