first pass at deprecation spec updates

lib/common/api/deprecate.js

@@ -1,7 +1,6 @@
 // Deprecate a method.
 const deprecate = function (oldName, newName, fn) {
-  var warned
-  warned = false
+  let warned = false
   return function () {
     if (!(warned || process.noDeprecation)) {
       warned = true
@@ -13,9 +12,8 @@ const deprecate = function (oldName, newName, fn) {
 
 // The method is renamed.
 deprecate.rename = function (object, oldName, newName) {
-  var newMethod, warned
-  warned = false
-  newMethod = function () {
+  let warned = false
+  const newMethod = function () {
     if (!(warned || process.noDeprecation)) {
       warned = true
       deprecate.warn(oldName, newName)
@@ -30,27 +28,25 @@ deprecate.rename = function (object, oldName, newName) {
 }
 
 // Forward the method to member.
-deprecate.member = function (object, method, member) {
-  var warned
-  warned = false
+deprecate.member = (object, method, member) => {
+  let warned = false
   object.prototype[method] = function () {
     if (!(warned || process.noDeprecation)) {
       warned = true
-      deprecate.warn(method, member + '.' + method)
+      deprecate.warn(method, `${member}.${method}`)
     }
     return this[member][method].apply(this[member], arguments)
   }
 }
 
 // Deprecate a property.
-deprecate.property = function (object, property, method) {
+deprecate.property = (object, property, method) => {
   return Object.defineProperty(object, property, {
     get: function () {
-      var warned
-      warned = false
+      let warned = false
       if (!(warned || process.noDeprecation)) {
         warned = true
-        deprecate.warn(property + ' property', method + ' method')
+        deprecate.warn(`${property} property`, `${method} method`)
       }
       return this[method]()
     }
@@ -58,14 +54,13 @@ deprecate.property = function (object, property, method) {
 }
 
 // Deprecate an event.
-deprecate.event = function (emitter, oldName, newName, fn) {
-  var warned = false
+deprecate.event = (emitter, oldName, newName, fn) => {
+  let warned = false
   return emitter.on(newName, function (...args) {
-    // there is listeners for old API.
     if (this.listenerCount(oldName) > 0) {
       if (!(warned || process.noDeprecation)) {
         warned = true
-        deprecate.warn("'" + oldName + "' event", "'" + newName + "' event")
+        deprecate.warn(`'${oldName}' event`, `'${newName}' event`)
       }
       if (fn != null) {
         fn.apply(this, arguments)
@@ -76,15 +71,14 @@ deprecate.event = function (emitter, oldName, newName, fn) {
   })
 }
 
-// Print deprecation warning.
-deprecate.warn = function (oldName, newName) {
-  return deprecate.log(oldName + ' is deprecated. Use ' + newName + ' instead.')
+deprecate.warn = (oldName, newName) => {
+  return deprecate.log(`'${oldName}' is deprecated. Use '${newName}' instead.`)
 }
 
-var deprecationHandler = null
+let deprecationHandler = null
 
 // Print deprecation message.
-deprecate.log = function (message) {
+deprecate.log = (message) => {
   if (typeof deprecationHandler === 'function') {
     deprecationHandler(message)
   } else if (process.throwDeprecation) {
@@ -92,16 +86,14 @@ deprecate.log = function (message) {
   } else if (process.traceDeprecation) {
     return console.trace(message)
   } else {
-    return console.warn('(electron) ' + message)
+    return console.warn(`(electron) ${message}`)
   }
 }
 
-deprecate.setHandler = function (handler) {
+deprecate.setHandler = (handler) => {
   deprecationHandler = handler
 }
 
-deprecate.getHandler = function () {
-  return deprecationHandler
-}
+deprecate.getHandler = () => deprecationHandler
 
 module.exports = deprecate

spec/api-deprecations-spec.js

@@ -1,7 +1,7 @@
 const assert = require('assert')
-const {deprecations, deprecate} = require('electron')
+const {deprecations, deprecate, ipcRenderer} = require('electron')
 
-describe('deprecations', () => {
+describe.only('deprecations', () => {
   beforeEach(() => {
     deprecations.setHandler(null)
     process.throwDeprecation = true
@@ -18,9 +18,50 @@ describe('deprecations', () => {
     assert.deepEqual(messages, ['this is deprecated'])
   })
 
+  it('returns a deprecation handler after one is set', () => {
+    const messages = []
+
+    deprecations.setHandler((message) => {
+      messages.push(message)
+    })
+
+    deprecate.log('this is deprecated')
+    assert(typeof deprecations.getHandler() === 'function')
+  })
+
+  it('returns a deprecation warning', () => {
+    const messages = []
+
+    deprecations.setHandler((message) => {
+      messages.push(message)
+    })
+
+    deprecate.warn('old', 'new')
+    assert.deepEqual(messages, [`'old' is deprecated. Use 'new' instead.`])
+  })
+
   it('throws an exception if no deprecation handler is specified', () => {
     assert.throws(() => {
       deprecate.log('this is deprecated')
     }, /this is deprecated/)
   })
+
+  // it('deprecates a property', () => {
+  //   deprecate.property(object, property, method)
+  // })
+  //
+  // it('deprecates an event', () => {
+  //   deprecate.event(emitter, oldName, newName, fn)
+  // })
+  //
+  // it('forwards a method to member', () => {
+  //   deprecate.member(object, method, member)
+  // })
+
+  it('renames a method', () => {
+    assert(typeof ipcRenderer.sendSync === 'function')
+    deprecate.rename(ipcRenderer, 'sendSync', 'sendChannelSync')
+    assert(typeof ipcRenderer.sendSync === 'undefined')
+    // assert(typeof ipcRenderer.sendChannelSync === 'function')
+  })
 })