refactor: add prefer-const to .eslintrc + fix errors (#14880)

.eslintrc

@@ -4,6 +4,9 @@
     "browser": true
   },
   "rules": {
-    "no-var": "error"
+    "no-var": "error",
+    "prefer-const": ["error", {
+      "destructuring": "all"
+    }]
   }
 }

lib/browser/api/app.js

@@ -42,7 +42,7 @@ Object.assign(app, {
 
 const nativeFn = app.getAppMetrics
 app.getAppMetrics = () => {
-  let metrics = nativeFn.call(app)
+  const metrics = nativeFn.call(app)
   for (const metric of metrics) {
     if ('memory' in metric) {
       deprecate.removeProperty(metric, 'memory')
@@ -96,7 +96,7 @@ app.allowNTLMCredentialsForAllDomains = function (allow) {
   if (!process.noDeprecations) {
     deprecate.warn('app.allowNTLMCredentialsForAllDomains', 'session.allowNTLMCredentialsForDomains')
   }
-  let domains = allow ? '*' : ''
+  const domains = allow ? '*' : ''
   if (!this.isReady()) {
     this.commandLine.appendSwitch('auth-server-whitelist', domains)
   } else {
@@ -106,7 +106,7 @@ app.allowNTLMCredentialsForAllDomains = function (allow) {
 
 // Routes the events to webContents.
 const events = ['login', 'certificate-error', 'select-client-certificate']
-for (let name of events) {
+for (const name of events) {
   app.on(name, (event, webContents, ...args) => {
     webContents.emit(name, event, ...args)
   })

lib/browser/api/auto-updater/squirrel-update-win.js

@@ -17,7 +17,7 @@ const isSameArgs = (args) => args.length === spawnedArgs.length && args.every((e
 
 // Spawn a command and invoke the callback when it completes with an error
 // and the output from standard out.
-let spawnUpdate = function (args, detached, callback) {
+const spawnUpdate = function (args, detached, callback) {
   let error, errorEmitted, stderr, stdout
 
   try {

lib/browser/api/browser-window.js

@@ -41,14 +41,14 @@ BrowserWindow.prototype._init = function () {
   this.webContents.on('-add-new-contents', (event, webContents, disposition,
     userGesture, left, top, width,
     height) => {
-    let urlFrameName = v8Util.getHiddenValue(webContents, 'url-framename')
+    const urlFrameName = v8Util.getHiddenValue(webContents, 'url-framename')
     if ((disposition !== 'foreground-tab' && disposition !== 'new-window' &&
          disposition !== 'background-tab') || !urlFrameName) {
       event.preventDefault()
       return
     }
 
-    let { url, frameName } = urlFrameName
+    const { url, frameName } = urlFrameName
     v8Util.deleteHiddenValue(webContents, 'url-framename')
     const options = {
       show: true,
@@ -115,7 +115,7 @@ BrowserWindow.prototype._init = function () {
   }
 
   const visibilityEvents = ['show', 'hide', 'minimize', 'maximize', 'restore']
-  for (let event of visibilityEvents) {
+  for (const event of visibilityEvents) {
     this.on(event, visibilityChanged)
   }
 
@@ -145,7 +145,7 @@ BrowserWindow.getAllWindows = () => {
 }
 
 BrowserWindow.getFocusedWindow = () => {
-  for (let window of BrowserWindow.getAllWindows()) {
+  for (const window of BrowserWindow.getAllWindows()) {
     if (window.isFocused() || window.isDevToolsFocused()) return window
   }
   return null

lib/browser/api/dialog.js

@@ -284,7 +284,7 @@ module.exports = {
   },
 
   showCertificateTrustDialog: function (...args) {
-    let [window, options, callback] = parseArgs(...args)
+    const [window, options, callback] = parseArgs(...args)
 
     if (options == null || typeof options !== 'object') {
       throw new TypeError('options must be an object')

lib/browser/api/menu-item.js

@@ -8,7 +8,7 @@ const MenuItem = function (options) {
   const { Menu } = require('electron')
 
   // Preserve extra fields specified by user
-  for (let key in options) {
+  for (const key in options) {
     if (!(key in this)) this[key] = options[key]
   }
   if (typeof this.role === 'string' || this.role instanceof String) {

lib/browser/api/menu.js

@@ -180,7 +180,7 @@ function areValidTemplateItems (template) {
 
 function sortTemplate (template) {
   const sorted = sortMenuItems(template)
-  for (let id in sorted) {
+  for (const id in sorted) {
     const item = sorted[id]
     if (Array.isArray(item.submenu)) {
       item.submenu = sortTemplate(item.submenu)

lib/browser/api/navigation-controller.js

@@ -141,11 +141,10 @@ const NavigationController = (function () {
   }
 
   NavigationController.prototype.goToOffset = function (offset) {
-    let pendingIndex
     if (!this.canGoToOffset(offset)) {
       return
     }
-    pendingIndex = this.currentIndex + offset
+    const pendingIndex = this.currentIndex + offset
     if (this.inPageIndex > -1 && pendingIndex >= this.inPageIndex) {
       this.pendingIndex = pendingIndex
       return this.webContents._goToOffset(offset)

lib/browser/api/net.js

@@ -119,7 +119,7 @@ class ClientRequest extends EventEmitter {
     let urlStr = options.url
 
     if (!urlStr) {
-      let urlObj = {}
+      const urlObj = {}
       const protocol = options.protocol || 'http:'
       if (!kSupportedProtocols.has(protocol)) {
         throw new Error('Protocol "' + protocol + '" not supported. ')
@@ -149,7 +149,7 @@ class ClientRequest extends EventEmitter {
         // an invalid request.
         throw new TypeError('Request path contains unescaped characters.')
       }
-      let pathObj = url.parse(options.path || '/')
+      const pathObj = url.parse(options.path || '/')
       urlObj.pathname = pathObj.pathname
       urlObj.search = pathObj.search
       urlObj.hash = pathObj.hash
@@ -161,7 +161,7 @@ class ClientRequest extends EventEmitter {
       throw new Error('redirect mode should be one of follow, error or manual')
     }
 
-    let urlRequestOptions = {
+    const urlRequestOptions = {
       method: method,
       url: urlStr,
       redirect: redirectPolicy
@@ -180,7 +180,7 @@ class ClientRequest extends EventEmitter {
       }
     }
 
-    let urlRequest = new URLRequest(urlRequestOptions)
+    const urlRequest = new URLRequest(urlRequestOptions)
 
     // Set back and forward links.
     this.urlRequest = urlRequest
@@ -192,7 +192,7 @@ class ClientRequest extends EventEmitter {
     this.extraHeaders = {}
 
     if (options.headers) {
-      for (let key in options.headers) {
+      for (const key in options.headers) {
         this.setHeader(key, options.headers[key])
       }
     }
@@ -286,8 +286,8 @@ class ClientRequest extends EventEmitter {
   }
 
   _write (chunk, encoding, callback, isLast) {
-    let chunkIsString = typeof chunk === 'string'
+    const chunkIsString = typeof chunk === 'string'
-    let chunkIsBuffer = chunk instanceof Buffer
+    const chunkIsBuffer = chunk instanceof Buffer
     if (!chunkIsString && !chunkIsBuffer) {
       throw new TypeError('First argument must be a string or Buffer.')
     }
@@ -306,7 +306,7 @@ class ClientRequest extends EventEmitter {
 
     // Headers are assumed to be sent on first call to _writeBuffer,
     // i.e. after the first call to write or end.
-    let result = this.urlRequest.write(chunk, isLast)
+    const result = this.urlRequest.write(chunk, isLast)
 
     // The write callback is fired asynchronously to mimic Node.js.
     if (callback) {
@@ -318,7 +318,7 @@ class ClientRequest extends EventEmitter {
 
   write (data, encoding, callback) {
     if (this.urlRequest.finished) {
-      let error = new Error('Write after end.')
+      const error = new Error('Write after end.')
       process.nextTick(writeAfterEndNT, this, error, callback)
       return true
     }

lib/browser/api/web-contents.js

@@ -317,7 +317,7 @@ module.exports = {
 
   getFocusedWebContents () {
     let focused = null
-    for (let contents of binding.getAllWebContents()) {
+    for (const contents of binding.getAllWebContents()) {
       if (!contents.isFocused()) continue
       if (focused == null) focused = contents
       // Return webview web contents which may be embedded inside another

lib/browser/objects-registry.js

@@ -51,7 +51,7 @@ class ObjectsRegistry {
   // then garbage collected in old page).
   remove (webContents, contextId, id) {
     const ownerKey = getOwnerKey(webContents, contextId)
-    let owner = this.owners[ownerKey]
+    const owner = this.owners[ownerKey]
     if (owner) {
       // Remove the reference in owner.
       owner.delete(id)
@@ -63,10 +63,10 @@ class ObjectsRegistry {
   // Clear all references to objects refrenced by the WebContents.
   clear (webContents, contextId) {
     const ownerKey = getOwnerKey(webContents, contextId)
-    let owner = this.owners[ownerKey]
+    const owner = this.owners[ownerKey]
     if (!owner) return
 
-    for (let id of owner) this.dereference(id)
+    for (const id of owner) this.dereference(id)
 
     delete this.owners[ownerKey]
   }
@@ -87,7 +87,7 @@ class ObjectsRegistry {
 
   // Private: Dereference the object from store.
   dereference (id) {
-    let pointer = this.storage[id]
+    const pointer = this.storage[id]
     if (pointer == null) {
       return
     }

lib/browser/rpc-server.js

@@ -37,8 +37,8 @@ const getObjectMembers = function (object) {
   }
   // Map properties to descriptors.
   return names.map((name) => {
-    let descriptor = Object.getOwnPropertyDescriptor(object, name)
+    const descriptor = Object.getOwnPropertyDescriptor(object, name)
-    let member = { name, enumerable: descriptor.enumerable, writable: false }
+    const member = { name, enumerable: descriptor.enumerable, writable: false }
     if (descriptor.get === undefined && typeof object[name] === 'function') {
       member.type = 'method'
     } else {
@@ -51,7 +51,7 @@ const getObjectMembers = function (object) {
 
 // Return the description of object's prototype.
 const getObjectPrototype = function (object) {
-  let proto = Object.getPrototypeOf(object)
+  const proto = Object.getPrototypeOf(object)
   if (proto === null || proto === Object.prototype) return null
   return {
     members: getObjectMembers(proto),
@@ -189,7 +189,7 @@ const unwrapArgs = function (sender, contextId, args) {
           then: metaToValue(meta.then)
         })
       case 'object': {
-        let ret = {}
+        const ret = {}
         Object.defineProperty(ret.constructor, 'name', { value: meta.name })
 
         for (const { name, value } of meta.members) {
@@ -213,7 +213,7 @@ const unwrapArgs = function (sender, contextId, args) {
         }
 
         const processId = sender.getProcessId()
-        let callIntoRenderer = function (...args) {
+        const callIntoRenderer = function (...args) {
           if (!sender.isDestroyed() && processId === sender.getProcessId()) {
             sender.send('ELECTRON_RENDERER_CALLBACK', contextId, meta.id, valueToMeta(sender, contextId, args))
           } else {
@@ -295,7 +295,7 @@ handleRemoteCommand('ELECTRON_BROWSER_CURRENT_WEB_CONTENTS', function (event, co
 
 handleRemoteCommand('ELECTRON_BROWSER_CONSTRUCTOR', function (event, contextId, id, args) {
   args = unwrapArgs(event.sender, contextId, args)
-  let constructor = objectsRegistry.get(id)
+  const constructor = objectsRegistry.get(id)
 
   if (constructor == null) {
     throwRPCError(`Cannot call constructor on missing remote object ${id}`)
@@ -306,7 +306,7 @@ handleRemoteCommand('ELECTRON_BROWSER_CONSTRUCTOR', function (event, contextId,
 
 handleRemoteCommand('ELECTRON_BROWSER_FUNCTION_CALL', function (event, contextId, id, args) {
   args = unwrapArgs(event.sender, contextId, args)
-  let func = objectsRegistry.get(id)
+  const func = objectsRegistry.get(id)
 
   if (func == null) {
     throwRPCError(`Cannot call function on missing remote object ${id}`)
@@ -317,7 +317,7 @@ handleRemoteCommand('ELECTRON_BROWSER_FUNCTION_CALL', function (event, contextId
 
 handleRemoteCommand('ELECTRON_BROWSER_MEMBER_CONSTRUCTOR', function (event, contextId, id, method, args) {
   args = unwrapArgs(event.sender, contextId, args)
-  let object = objectsRegistry.get(id)
+  const object = objectsRegistry.get(id)
 
   if (object == null) {
     throwRPCError(`Cannot call constructor '${method}' on missing remote object ${id}`)
@@ -328,7 +328,7 @@ handleRemoteCommand('ELECTRON_BROWSER_MEMBER_CONSTRUCTOR', function (event, cont
 
 handleRemoteCommand('ELECTRON_BROWSER_MEMBER_CALL', function (event, contextId, id, method, args) {
   args = unwrapArgs(event.sender, contextId, args)
-  let obj = objectsRegistry.get(id)
+  const obj = objectsRegistry.get(id)
 
   if (obj == null) {
     throwRPCError(`Cannot call function '${method}' on missing remote object ${id}`)
@@ -339,7 +339,7 @@ handleRemoteCommand('ELECTRON_BROWSER_MEMBER_CALL', function (event, contextId,
 
 handleRemoteCommand('ELECTRON_BROWSER_MEMBER_SET', function (event, contextId, id, name, args) {
   args = unwrapArgs(event.sender, contextId, args)
-  let obj = objectsRegistry.get(id)
+  const obj = objectsRegistry.get(id)
 
   if (obj == null) {
     throwRPCError(`Cannot set property '${name}' on missing remote object ${id}`)
@@ -350,7 +350,7 @@ handleRemoteCommand('ELECTRON_BROWSER_MEMBER_SET', function (event, contextId, i
 })
 
 handleRemoteCommand('ELECTRON_BROWSER_MEMBER_GET', function (event, contextId, id, name) {
-  let obj = objectsRegistry.get(id)
+  const obj = objectsRegistry.get(id)
 
   if (obj == null) {
     throwRPCError(`Cannot get property '${name}' on missing remote object ${id}`)
@@ -369,14 +369,14 @@ handleRemoteCommand('ELECTRON_BROWSER_CONTEXT_RELEASE', (event, contextId) => {
 })
 
 handleRemoteCommand('ELECTRON_BROWSER_GUEST_WEB_CONTENTS', function (event, contextId, guestInstanceId) {
-  let guestViewManager = require('@electron/internal/browser/guest-view-manager')
+  const guestViewManager = require('@electron/internal/browser/guest-view-manager')
   return valueToMeta(event.sender, contextId, guestViewManager.getGuest(guestInstanceId))
 })
 
 ipcMain.on('ELECTRON_BROWSER_ASYNC_CALL_TO_GUEST_VIEW', function (event, requestId, guestInstanceId, method, args, hasCallback) {
   new Promise(resolve => {
-    let guestViewManager = require('./guest-view-manager')
+    const guestViewManager = require('./guest-view-manager')
-    let guest = guestViewManager.getGuest(guestInstanceId)
+    const guest = guestViewManager.getGuest(guestInstanceId)
     if (guest.hostWebContents !== event.sender) {
       throw new Error('Access denied')
     }
@@ -396,8 +396,8 @@ ipcMain.on('ELECTRON_BROWSER_ASYNC_CALL_TO_GUEST_VIEW', function (event, request
 
 ipcMain.on('ELECTRON_BROWSER_SYNC_CALL_TO_GUEST_VIEW', function (event, guestInstanceId, method, args) {
   try {
-    let guestViewManager = require('@electron/internal/browser/guest-view-manager')
+    const guestViewManager = require('@electron/internal/browser/guest-view-manager')
-    let guest = guestViewManager.getGuest(guestInstanceId)
+    const guest = guestViewManager.getGuest(guestInstanceId)
     if (guest.hostWebContents !== event.sender) {
       throw new Error('Access denied')
     }

lib/common/api/crash-reporter.js

@@ -5,7 +5,7 @@ const binding = process.atomBinding('crash_reporter')
 
 const sendSync = function (channel, ...args) {
   if (process.type === 'browser') {
-    let event = {}
+    const event = {}
     electron.ipcMain.emit(channel, event, ...args)
     return event.returnValue
   } else {

lib/renderer/api/remote.js

@@ -36,7 +36,7 @@ function wrapArgs (args, visited = new Set()) {
 
     if (Array.isArray(value)) {
       visited.add(value)
-      let meta = {
+      const meta = {
         type: 'array',
         value: wrapArgs(value, visited)
       }
@@ -67,13 +67,13 @@ function wrapArgs (args, visited = new Set()) {
         }
       }
 
-      let meta = {
+      const meta = {
         type: 'object',
         name: value.constructor ? value.constructor.name : '',
         members: []
       }
       visited.add(value)
-      for (let prop in value) {
+      for (const prop in value) {
         meta.members.push({
           name: prop,
           value: valueToMeta(value[prop])
@@ -109,10 +109,10 @@ function wrapArgs (args, visited = new Set()) {
 function setObjectMembers (ref, object, metaId, members) {
   if (!Array.isArray(members)) return
 
-  for (let member of members) {
+  for (const member of members) {
     if (object.hasOwnProperty(member.name)) continue
 
-    let descriptor = { enumerable: member.enumerable }
+    const descriptor = { enumerable: member.enumerable }
     if (member.type === 'method') {
       const remoteMemberFunction = function (...args) {
         let command
@@ -163,7 +163,7 @@ function setObjectMembers (ref, object, metaId, members) {
 // This matches |getObjectPrototype| in rpc-server.
 function setObjectPrototype (ref, object, metaId, descriptor) {
   if (descriptor === null) return
-  let proto = {}
+  const proto = {}
   setObjectMembers(ref, proto, metaId, descriptor.members)
   setObjectPrototype(ref, proto, metaId, descriptor.proto)
   Object.setPrototypeOf(object, proto)
@@ -201,7 +201,7 @@ function proxyFunctionProperties (remoteMemberFunction, metaId, name) {
       return Object.getOwnPropertyNames(target)
     },
     getOwnPropertyDescriptor: (target, property) => {
-      let descriptor = Object.getOwnPropertyDescriptor(target, property)
+      const descriptor = Object.getOwnPropertyDescriptor(target, property)
       if (descriptor) return descriptor
       loadRemoteProperties()
       return Object.getOwnPropertyDescriptor(target, property)
@@ -231,7 +231,7 @@ function metaToValue (meta) {
 
     // A shadow class to represent the remote function object.
     if (meta.type === 'function') {
-      let remoteFunction = function (...args) {
+      const remoteFunction = function (...args) {
         let command
         if (this && this.constructor === remoteFunction) {
           command = 'ELECTRON_BROWSER_CONSTRUCTOR'
@@ -262,7 +262,7 @@ function metaToValue (meta) {
 function metaToPlainObject (meta) {
   const obj = (() => meta.type === 'error' ? new Error() : {})()
   for (let i = 0; i < meta.members.length; i++) {
-    let { name, value } = meta.members[i]
+    const { name, value } = meta.members[i]
     obj[name] = value
   }
   return obj

lib/renderer/extensions/storage.js

@@ -91,7 +91,7 @@ const getStorageManager = (storageType, extensionId) => {
         // eslint-disable-next-line standard/no-callback-literal
         if (keys.length === 0) return callback({})
 
-        let items = {}
+        const items = {}
         keys.forEach(function (key) {
           let value = storage[key]
           if (value == null) value = defaults[key]

lib/renderer/init.js

@@ -48,7 +48,7 @@ let preloadScript = null
 let preloadScripts = []
 let isBackgroundPage = false
 let appPath = null
-for (let arg of process.argv) {
+for (const arg of process.argv) {
   if (arg.indexOf('--guest-instance-id=') === 0) {
     // This is a guest web view.
     process.guestInstanceId = parseInt(arg.substr(arg.indexOf('=') + 1))

lib/sandboxed_renderer/init.js

@@ -19,7 +19,7 @@ v8Util.setHiddenValue(global, 'Buffer', Buffer)
 v8Util.setHiddenValue(global, 'ipc', new EventEmitter())
 // The process object created by browserify is not an event emitter, fix it so
 // the API is more compatible with non-sandboxed renderers.
-for (let prop of Object.keys(EventEmitter.prototype)) {
+for (const prop of Object.keys(EventEmitter.prototype)) {
   if (process.hasOwnProperty(prop)) {
     delete process[prop]
   }

lib/worker/init.js

@@ -22,7 +22,7 @@ global.module = module
 
 // Set the __filename to the path of html file if it is file: protocol.
 if (self.location.protocol === 'file:') {
-  let pathname = process.platform === 'win32' && self.location.pathname[0] === '/' ? self.location.pathname.substr(1) : self.location.pathname
+  const pathname = process.platform === 'win32' && self.location.pathname[0] === '/' ? self.location.pathname.substr(1) : self.location.pathname
   global.__filename = path.normalize(decodeURIComponent(pathname))
   global.__dirname = path.dirname(global.__filename)
 

script/ci-release-build.js

@@ -51,7 +51,7 @@ async function makeRequest (requestOptions, parseResponse) {
 
 async function circleCIcall (buildUrl, targetBranch, job, options) {
   console.log(`Triggering CircleCI to run build job: ${job} on branch: ${targetBranch} with release flag.`)
-  let buildRequest = {
+  const buildRequest = {
     'build_parameters': {
       'CIRCLE_JOB': job
     }
@@ -67,7 +67,7 @@ async function circleCIcall (buildUrl, targetBranch, job, options) {
     buildRequest.build_parameters.AUTO_RELEASE = 'true'
   }
 
-  let circleResponse = await makeRequest({
+  const circleResponse = await makeRequest({
     method: 'POST',
     url: buildUrl,
     headers: {
@@ -117,7 +117,7 @@ async function callAppVeyor (targetBranch, job, options) {
     }),
     method: 'POST'
   }
-  let appVeyorResponse = await makeRequest(requestOpts, true).catch(err => {
+  const appVeyorResponse = await makeRequest(requestOpts, true).catch(err => {
     console.log('Error calling AppVeyor:', err)
   })
   const buildUrl = `https://windows-ci.electronjs.org/project/AppVeyor/${appVeyorJobs[job]}/build/${appVeyorResponse.version}`
@@ -147,7 +147,7 @@ async function buildVSTS (targetBranch, options) {
     environmentVariables.UPLOAD_TO_S3 = 1
   }
 
-  let requestOpts = {
+  const requestOpts = {
     url: `${vstsURL}/definitions?api-version=4.1`,
     auth: {
       user: '',
@@ -157,7 +157,7 @@ async function buildVSTS (targetBranch, options) {
       'Content-Type': 'application/json'
     }
   }
-  let vstsResponse = await makeRequest(requestOpts, true).catch(err => {
+  const vstsResponse = await makeRequest(requestOpts, true).catch(err => {
     console.log('Error calling VSTS to get build definitions:', err)
   })
   let buildsToRun = []
@@ -170,14 +170,14 @@ async function buildVSTS (targetBranch, options) {
 }
 
 async function callVSTSBuild (build, targetBranch, environmentVariables) {
-  let buildBody = {
+  const buildBody = {
     definition: build,
     sourceBranch: targetBranch
   }
   if (Object.keys(environmentVariables).length !== 0) {
     buildBody.parameters = JSON.stringify(environmentVariables)
   }
-  let requestOpts = {
+  const requestOpts = {
     url: `${vstsURL}/builds?api-version=4.1`,
     auth: {
       user: '',
@@ -189,7 +189,7 @@ async function callVSTSBuild (build, targetBranch, environmentVariables) {
     body: JSON.stringify(buildBody),
     method: 'POST'
   }
-  let vstsResponse = await makeRequest(requestOpts, true).catch(err => {
+  const vstsResponse = await makeRequest(requestOpts, true).catch(err => {
     console.log(`Error calling VSTS for job ${build.name}`, err)
   })
   console.log(`VSTS release build request for ${build.name} successful. Check ${vstsResponse._links.web.href} for status.`)

script/find-release.js

@@ -12,11 +12,11 @@ const version = process.argv[2]
 
 async function findRelease () {
   github.authenticate({ type: 'token', token: process.env.ELECTRON_GITHUB_TOKEN })
-  let releases = await github.repos.getReleases({
+  const releases = await github.repos.getReleases({
     owner: 'electron',
     repo: version.indexOf('nightly') > 0 ? 'nightlies' : 'electron'
   })
-  let targetRelease = releases.data.find(release => {
+  const targetRelease = releases.data.find(release => {
     return release.tag_name === version
   })
   let returnObject = {}

script/get-last-major-for-master.js

@@ -5,7 +5,7 @@ const gitDir = path.resolve(__dirname, '..')
 
 async function determineNextMajorForMaster () {
   let branchNames
-  let result = await GitProcess.exec(['branch', '-a', '--remote', '--list', 'origin/[0-9]-[0-9]-x'], gitDir)
+  const result = await GitProcess.exec(['branch', '-a', '--remote', '--list', 'origin/[0-9]-[0-9]-x'], gitDir)
   if (result.exitCode === 0) {
     branchNames = result.stdout.trim().split('\n')
     const filtered = branchNames.map(b => b.replace('origin/', ''))

script/prepare-release.js

@@ -34,15 +34,15 @@ async function getNewVersion (dryRun) {
   if (!dryRun) {
     console.log(`Bumping for new "${versionType}" version.`)
   }
-  let bumpScript = path.join(__dirname, 'bump-version.py')
+  const bumpScript = path.join(__dirname, 'bump-version.py')
-  let scriptArgs = [bumpScript, '--bump', versionType]
+  const scriptArgs = [bumpScript, '--bump', versionType]
   if (dryRun) {
     scriptArgs.push('--dry-run')
   }
   try {
     let bumpVersion = execSync(scriptArgs.join(' '), { encoding: 'UTF-8' })
     bumpVersion = bumpVersion.substr(bumpVersion.indexOf(':') + 1).trim()
-    let newVersion = `v${bumpVersion}`
+    const newVersion = `v${bumpVersion}`
     if (!dryRun) {
       console.log(`${pass} Successfully bumped version to ${newVersion}`)
     }
@@ -55,15 +55,15 @@ async function getNewVersion (dryRun) {
 
 async function getCurrentBranch (gitDir) {
   console.log(`Determining current git branch`)
-  let gitArgs = ['rev-parse', '--abbrev-ref', 'HEAD']
+  const gitArgs = ['rev-parse', '--abbrev-ref', 'HEAD']
-  let branchDetails = await GitProcess.exec(gitArgs, gitDir)
+  const branchDetails = await GitProcess.exec(gitArgs, gitDir)
   if (branchDetails.exitCode === 0) {
-    let currentBranch = branchDetails.stdout.trim()
+    const currentBranch = branchDetails.stdout.trim()
     console.log(`${pass} Successfully determined current git branch is ` +
       `${currentBranch}`)
     return currentBranch
   } else {
-    let error = GitProcess.parseError(branchDetails.stderr)
+    const error = GitProcess.parseError(branchDetails.stderr)
     console.log(`${fail} Could not get details for the current branch,
       error was ${branchDetails.stderr}`, error)
     process.exit(1)
@@ -75,7 +75,7 @@ async function getReleaseNotes (currentBranch) {
     return 'Nightlies do not get release notes, please compare tags for info'
   }
   console.log(`Generating release notes for ${currentBranch}.`)
-  let githubOpts = {
+  const githubOpts = {
     owner: 'electron',
     repo: targetRepo,
     base: `v${pkg.version}`,
@@ -88,7 +88,7 @@ async function getReleaseNotes (currentBranch) {
     releaseNotes = '(placeholder)\n'
   }
   console.log(`Checking for commits from ${pkg.version} to ${currentBranch}`)
-  let commitComparison = await github.repos.compareCommits(githubOpts)
+  const commitComparison = await github.repos.compareCommits(githubOpts)
     .catch(err => {
       console.log(`${fail} Error checking for commits from ${pkg.version} to ` +
         `${currentBranch}`, err)
@@ -112,7 +112,7 @@ async function getReleaseNotes (currentBranch) {
       let prNumber
       if (prMatch) {
         commitMessage = commitMessage.replace(mergeRE, '').replace('\n', '')
-        let newlineMatch = commitMessage.match(newlineRE)
+        const newlineMatch = commitMessage.match(newlineRE)
         if (newlineMatch) {
           commitMessage = newlineMatch[1]
         }
@@ -138,19 +138,19 @@ async function getReleaseNotes (currentBranch) {
 }
 
 async function createRelease (branchToTarget, isBeta) {
-  let releaseNotes = await getReleaseNotes(branchToTarget)
+  const releaseNotes = await getReleaseNotes(branchToTarget)
-  let newVersion = await getNewVersion()
+  const newVersion = await getNewVersion()
   await tagRelease(newVersion)
   const githubOpts = {
     owner: 'electron',
     repo: targetRepo
   }
   console.log(`Checking for existing draft release.`)
-  let releases = await github.repos.getReleases(githubOpts)
+  const releases = await github.repos.getReleases(githubOpts)
     .catch(err => {
       console.log('$fail} Could not get releases.  Error was', err)
     })
-  let drafts = releases.data.filter(release => release.draft &&
+  const drafts = releases.data.filter(release => release.draft &&
     release.tag_name === newVersion)
   if (drafts.length > 0) {
     console.log(`${fail} Aborting because draft release for
@@ -188,7 +188,7 @@ async function createRelease (branchToTarget, isBeta) {
 }
 
 async function pushRelease (branch) {
-  let pushDetails = await GitProcess.exec(['push', 'origin', `HEAD:${branch}`, '--follow-tags'], gitDir)
+  const pushDetails = await GitProcess.exec(['push', 'origin', `HEAD:${branch}`, '--follow-tags'], gitDir)
   if (pushDetails.exitCode === 0) {
     console.log(`${pass} Successfully pushed the release.  Wait for ` +
       `release builds to finish before running "npm run release".`)
@@ -208,7 +208,7 @@ async function runReleaseBuilds (branch) {
 
 async function tagRelease (version) {
   console.log(`Tagging release ${version}.`)
-  let checkoutDetails = await GitProcess.exec([ 'tag', '-a', '-m', version, version ], gitDir)
+  const checkoutDetails = await GitProcess.exec([ 'tag', '-a', '-m', version, version ], gitDir)
   if (checkoutDetails.exitCode === 0) {
     console.log(`${pass} Successfully tagged ${version}.`)
   } else {
@@ -219,7 +219,7 @@ async function tagRelease (version) {
 }
 
 async function verifyNewVersion () {
-  let newVersion = await getNewVersion(true)
+  const newVersion = await getNewVersion(true)
   let response
   if (args.automaticRelease) {
     response = 'y'
@@ -249,19 +249,19 @@ async function promptForVersion (version) {
 
 // function to determine if there have been commits to master since the last release
 async function changesToRelease () {
-  let lastCommitWasRelease = new RegExp(`^Bump v[0-9.]*(-beta[0-9.]*)?(-nightly[0-9.]*)?$`, 'g')
+  const lastCommitWasRelease = new RegExp(`^Bump v[0-9.]*(-beta[0-9.]*)?(-nightly[0-9.]*)?$`, 'g')
-  let lastCommit = await GitProcess.exec(['log', '-n', '1', `--pretty=format:'%s'`], gitDir)
+  const lastCommit = await GitProcess.exec(['log', '-n', '1', `--pretty=format:'%s'`], gitDir)
   return !lastCommitWasRelease.test(lastCommit.stdout)
 }
 
 async function prepareRelease (isBeta, notesOnly) {
   if (args.dryRun) {
-    let newVersion = await getNewVersion(true)
+    const newVersion = await getNewVersion(true)
     console.log(newVersion)
   } else {
     const currentBranch = (args.branch) ? args.branch : await getCurrentBranch(gitDir)
     if (notesOnly) {
-      let releaseNotes = await getReleaseNotes(currentBranch)
+      const releaseNotes = await getReleaseNotes(currentBranch)
       console.log(`Draft release notes are: \n${releaseNotes}`)
     } else {
       const changes = await changesToRelease(currentBranch)

script/publish-to-npm.js

@@ -141,15 +141,15 @@ new Promise((resolve, reject) => {
 async function getCurrentBranch () {
   const gitDir = path.resolve(__dirname, '..')
   console.log(`Determining current git branch`)
-  let gitArgs = ['rev-parse', '--abbrev-ref', 'HEAD']
+  const gitArgs = ['rev-parse', '--abbrev-ref', 'HEAD']
-  let branchDetails = await GitProcess.exec(gitArgs, gitDir)
+  const branchDetails = await GitProcess.exec(gitArgs, gitDir)
   if (branchDetails.exitCode === 0) {
-    let currentBranch = branchDetails.stdout.trim()
+    const currentBranch = branchDetails.stdout.trim()
     console.log(`Successfully determined current git branch is ` +
       `${currentBranch}`)
     return currentBranch
   } else {
-    let error = GitProcess.parseError(branchDetails.stderr)
+    const error = GitProcess.parseError(branchDetails.stderr)
     console.log(`Could not get details for the current branch,
       error was ${branchDetails.stderr}`, error)
     process.exit(1)

script/release.js

@@ -24,15 +24,14 @@ const github = new GitHub({
 github.authenticate({ type: 'token', token: process.env.ELECTRON_GITHUB_TOKEN })
 
 async function getDraftRelease (version, skipValidation) {
-  let releaseInfo = await github.repos.getReleases({ owner: 'electron', repo: targetRepo })
+  const releaseInfo = await github.repos.getReleases({ owner: 'electron', repo: targetRepo })
-  let drafts
   let versionToCheck
   if (version) {
     versionToCheck = version
   } else {
     versionToCheck = pkgVersion
   }
-  drafts = releaseInfo.data
+  const drafts = releaseInfo.data
     .filter(release => release.tag_name === versionToCheck &&
       release.draft === true)
   const draft = drafts[0]
@@ -143,19 +142,19 @@ function checkVersion () {
   if (args.skipVersionCheck) return
 
   console.log(`Verifying that app version matches package version ${pkgVersion}.`)
-  let startScript = path.join(__dirname, 'start.py')
+  const startScript = path.join(__dirname, 'start.py')
-  let scriptArgs = ['--version']
+  const scriptArgs = ['--version']
   if (args.automaticRelease) {
     scriptArgs.unshift('-R')
   }
-  let appVersion = runScript(startScript, scriptArgs).trim()
+  const appVersion = runScript(startScript, scriptArgs).trim()
   check((pkgVersion.indexOf(appVersion) === 0), `App version ${appVersion} matches ` +
     `package version ${pkgVersion}.`, true)
 }
 
 function runScript (scriptName, scriptArgs, cwd) {
-  let scriptCommand = `${scriptName} ${scriptArgs.join(' ')}`
+  const scriptCommand = `${scriptName} ${scriptArgs.join(' ')}`
-  let scriptOptions = {
+  const scriptOptions = {
     encoding: 'UTF-8'
   }
   if (cwd) {
@@ -171,21 +170,21 @@ function runScript (scriptName, scriptArgs, cwd) {
 
 function uploadNodeShasums () {
   console.log('Uploading Node SHASUMS file to S3.')
-  let scriptPath = path.join(__dirname, 'upload-node-checksums.py')
+  const scriptPath = path.join(__dirname, 'upload-node-checksums.py')
   runScript(scriptPath, ['-v', pkgVersion])
   console.log(`${pass} Done uploading Node SHASUMS file to S3.`)
 }
 
 function uploadIndexJson () {
   console.log('Uploading index.json to S3.')
-  let scriptPath = path.join(__dirname, 'upload-index-json.py')
+  const scriptPath = path.join(__dirname, 'upload-index-json.py')
   runScript(scriptPath, [pkgVersion])
   console.log(`${pass} Done uploading index.json to S3.`)
 }
 
 async function createReleaseShasums (release) {
-  let fileName = 'SHASUMS256.txt'
+  const fileName = 'SHASUMS256.txt'
-  let existingAssets = release.assets.filter(asset => asset.name === fileName)
+  const existingAssets = release.assets.filter(asset => asset.name === fileName)
   if (existingAssets.length > 0) {
     console.log(`${fileName} already exists on GitHub; deleting before creating new file.`)
     await github.repos.deleteAsset({
@@ -197,17 +196,17 @@ async function createReleaseShasums (release) {
     })
   }
   console.log(`Creating and uploading the release ${fileName}.`)
-  let scriptPath = path.join(__dirname, 'merge-electron-checksums.py')
+  const scriptPath = path.join(__dirname, 'merge-electron-checksums.py')
-  let checksums = runScript(scriptPath, ['-v', pkgVersion])
+  const checksums = runScript(scriptPath, ['-v', pkgVersion])
   console.log(`${pass} Generated release SHASUMS.`)
-  let filePath = await saveShaSumFile(checksums, fileName)
+  const filePath = await saveShaSumFile(checksums, fileName)
   console.log(`${pass} Created ${fileName} file.`)
   await uploadShasumFile(filePath, fileName, release)
   console.log(`${pass} Successfully uploaded ${fileName} to GitHub.`)
 }
 
 async function uploadShasumFile (filePath, fileName, release) {
-  let githubOpts = {
+  const githubOpts = {
     owner: 'electron',
     repo: targetRepo,
     id: release.id,
@@ -242,7 +241,7 @@ function saveShaSumFile (checksums, fileName) {
 }
 
 async function publishRelease (release) {
-  let githubOpts = {
+  const githubOpts = {
     owner: 'electron',
     repo: targetRepo,
     id: release.id,
@@ -264,7 +263,7 @@ async function makeRelease (releaseToValidate) {
       console.log('Release to validate !=== true')
     }
     console.log(`Validating release ${releaseToValidate}`)
-    let release = await getDraftRelease(releaseToValidate)
+    const release = await getDraftRelease(releaseToValidate)
     await validateReleaseAssets(release, true)
   } else {
     checkVersion()
@@ -295,8 +294,8 @@ async function makeTempDir () {
 }
 
 async function verifyAssets (release) {
-  let downloadDir = await makeTempDir()
+  const downloadDir = await makeTempDir()
-  let githubOpts = {
+  const githubOpts = {
     owner: 'electron',
     repo: targetRepo,
     headers: {
@@ -304,10 +303,10 @@ async function verifyAssets (release) {
     }
   }
   console.log(`Downloading files from GitHub to verify shasums`)
-  let shaSumFile = 'SHASUMS256.txt'
+  const shaSumFile = 'SHASUMS256.txt'
   let filesToCheck = await Promise.all(release.assets.map(async (asset) => {
     githubOpts.id = asset.id
-    let assetDetails = await github.repos.getAsset(githubOpts)
+    const assetDetails = await github.repos.getAsset(githubOpts)
     await downloadFiles(assetDetails.meta.location, downloadDir, false, asset.name)
     return asset.name
   })).catch(err => {
@@ -328,7 +327,7 @@ async function verifyAssets (release) {
 
 function downloadFiles (urls, directory, quiet, targetName) {
   return new Promise((resolve, reject) => {
-    let nuggetOpts = {
+    const nuggetOpts = {
       dir: directory
     }
     if (quiet) {
@@ -348,32 +347,32 @@ function downloadFiles (urls, directory, quiet, targetName) {
 }
 
 async function verifyShasums (urls, isS3) {
-  let fileSource = isS3 ? 'S3' : 'GitHub'
+  const fileSource = isS3 ? 'S3' : 'GitHub'
   console.log(`Downloading files from ${fileSource} to verify shasums`)
-  let downloadDir = await makeTempDir()
+  const downloadDir = await makeTempDir()
   let filesToCheck = []
   try {
     if (!isS3) {
       await downloadFiles(urls, downloadDir)
       filesToCheck = urls.map(url => {
-        let currentUrl = new URL(url)
+        const currentUrl = new URL(url)
         return path.basename(currentUrl.pathname)
       }).filter(file => file.indexOf('SHASUMS') === -1)
     } else {
       const s3VersionPath = `/atom-shell/dist/${pkgVersion}/`
       await Promise.all(urls.map(async (url) => {
-        let currentUrl = new URL(url)
+        const currentUrl = new URL(url)
-        let dirname = path.dirname(currentUrl.pathname)
+        const dirname = path.dirname(currentUrl.pathname)
-        let filename = path.basename(currentUrl.pathname)
+        const filename = path.basename(currentUrl.pathname)
-        let s3VersionPathIdx = dirname.indexOf(s3VersionPath)
+        const s3VersionPathIdx = dirname.indexOf(s3VersionPath)
         if (s3VersionPathIdx === -1 || dirname === s3VersionPath) {
           if (s3VersionPathIdx !== -1 && filename.indexof('SHASUMS') === -1) {
             filesToCheck.push(filename)
           }
           await downloadFiles(url, downloadDir, true)
         } else {
-          let subDirectory = dirname.substr(s3VersionPathIdx + s3VersionPath.length)
+          const subDirectory = dirname.substr(s3VersionPathIdx + s3VersionPath.length)
-          let fileDirectory = path.join(downloadDir, subDirectory)
+          const fileDirectory = path.join(downloadDir, subDirectory)
           try {
             fs.statSync(fileDirectory)
           } catch (err) {
@@ -418,8 +417,8 @@ async function verifyShasums (urls, isS3) {
 async function validateChecksums (validationArgs) {
   console.log(`Validating checksums for files from ${validationArgs.fileSource} ` +
     `against ${validationArgs.shaSumFile}.`)
-  let shaSumFilePath = path.join(validationArgs.fileDirectory, validationArgs.shaSumFile)
+  const shaSumFilePath = path.join(validationArgs.fileDirectory, validationArgs.shaSumFile)
-  let checker = new sumchecker.ChecksumValidator(validationArgs.algorithm,
+  const checker = new sumchecker.ChecksumValidator(validationArgs.algorithm,
     shaSumFilePath, validationArgs.checkerOpts)
   await checker.validate(validationArgs.fileDirectory, validationArgs.filesToCheck)
     .catch(err => {

script/upload-to-github.js

@@ -8,14 +8,14 @@ if (process.argv.length < 6) {
   console.log('Usage: upload-to-github filePath fileName releaseId')
   process.exit(1)
 }
-let filePath = process.argv[2]
+const filePath = process.argv[2]
-let fileName = process.argv[3]
+const fileName = process.argv[3]
-let releaseId = process.argv[4]
+const releaseId = process.argv[4]
-let releaseVersion = process.argv[5]
+const releaseVersion = process.argv[5]
 
 const targetRepo = releaseVersion.indexOf('nightly') > 0 ? 'nightlies' : 'electron'
 
-let githubOpts = {
+const githubOpts = {
   owner: 'electron',
   repo: targetRepo,
   id: releaseId,
@@ -34,7 +34,7 @@ function uploadToGitHub () {
       console.log(`Error uploading ${fileName} to GitHub, will retry.  Error was:`, err)
       retry++
       github.repos.getRelease(githubOpts).then(release => {
-        let existingAssets = release.data.assets.filter(asset => asset.name === fileName)
+        const existingAssets = release.data.assets.filter(asset => asset.name === fileName)
         if (existingAssets.length > 0) {
           console.log(`${fileName} already exists; will delete before retrying upload.`)
           github.repos.deleteAsset({

spec/api-browser-view-spec.js

@@ -116,12 +116,12 @@ describe('BrowserView module', () => {
       w.setBrowserView(view)
       expect(view.id).to.not.be.null()
 
-      let view2 = w.getBrowserView()
+      const view2 = w.getBrowserView()
       expect(view2.webContents.id).to.equal(view.webContents.id)
     })
 
     it('returns null if none is set', () => {
-      let view = w.getBrowserView()
+      const view = w.getBrowserView()
       expect(view).to.be.null()
     })
   })
@@ -145,7 +145,7 @@ describe('BrowserView module', () => {
       w.setBrowserView(view)
       expect(view.id).to.not.be.null()
 
-      let view2 = BrowserView.fromId(view.id)
+      const view2 = BrowserView.fromId(view.id)
       expect(view2.webContents.id).to.equal(view.webContents.id)
     })
   })
@@ -156,7 +156,7 @@ describe('BrowserView module', () => {
       w.setBrowserView(view)
       expect(view.id).to.not.be.null()
 
-      let view2 = BrowserView.fromWebContents(view.webContents)
+      const view2 = BrowserView.fromWebContents(view.webContents)
       expect(view2.webContents.id).to.equal(view.webContents.id)
     })
   })

spec/api-browser-window-affinity-spec.js

@@ -129,7 +129,7 @@ describe('BrowserWindow with affinity module', () => {
           nodeIntegration: false
         })
       ]).then(args => {
-        let w1 = args[1]
+        const w1 = args[1]
         return Promise.all([
           testNodeIntegration(false),
           w1,
@@ -169,7 +169,7 @@ describe('BrowserWindow with affinity module', () => {
           nodeIntegration: true
         })
       ]).then(args => {
-        let w1 = args[1]
+        const w1 = args[1]
         return Promise.all([
           testNodeIntegration(true),
           w1,

spec/api-browser-window-spec.js

@@ -75,7 +75,7 @@ describe('BrowserWindow module', () => {
             if (data) body += data
           })
           req.on('end', () => {
-            let parsedData = qs.parse(body)
+            const parsedData = qs.parse(body)
             fs.readFile(filePath, (err, data) => {
               if (err) return
               if (parsedData.username === 'test' &&
@@ -187,7 +187,7 @@ describe('BrowserWindow module', () => {
       function * genNavigationEvent () {
         let eventOptions = null
         while ((eventOptions = events.shift()) && events.length) {
-          let w = new BrowserWindow({ show: false })
+          const w = new BrowserWindow({ show: false })
           eventOptions.id = w.id
           eventOptions.responseEvent = responseEvent
           ipcRenderer.send('test-webcontents-navigation-observer', eventOptions)
@@ -195,7 +195,7 @@ describe('BrowserWindow module', () => {
         }
       }
 
-      let gen = genNavigationEvent()
+      const gen = genNavigationEvent()
       ipcRenderer.on(responseEvent, () => {
         if (!gen.next().value) done()
       })
@@ -1399,7 +1399,7 @@ describe('BrowserWindow module', () => {
     describe('"sandbox" option', () => {
       function waitForEvents (emitter, events, callback) {
         let count = events.length
-        for (let event of events) {
+        for (const event of events) {
           emitter.once(event, () => {
             if (!--count) callback()
           })
@@ -1473,7 +1473,7 @@ describe('BrowserWindow module', () => {
             preload: preload
           }
         })
-        let htmlPath = path.join(fixtures, 'api', 'sandbox.html?exit-event')
+        const htmlPath = path.join(fixtures, 'api', 'sandbox.html?exit-event')
         const pageUrl = 'file://' + htmlPath
         w.loadURL(pageUrl)
         ipcMain.once('answer', function (event, url) {
@@ -1496,7 +1496,7 @@ describe('BrowserWindow module', () => {
           }
         })
         ipcRenderer.send('set-web-preferences-on-next-new-window', w.webContents.id, 'preload', preload)
-        let htmlPath = path.join(fixtures, 'api', 'sandbox.html?window-open')
+        const htmlPath = path.join(fixtures, 'api', 'sandbox.html?window-open')
         const pageUrl = 'file://' + htmlPath
         w.loadURL(pageUrl)
         w.webContents.once('new-window', (e, url, frameName, disposition, options) => {
@@ -2763,7 +2763,7 @@ describe('BrowserWindow module', () => {
       // dynamically.
       it('can be changed with hasShadow option', () => {
         w.destroy()
-        let hasShadow = process.platform !== 'darwin'
+        const hasShadow = process.platform !== 'darwin'
         w = new BrowserWindow({ show: false, hasShadow: hasShadow })
         assert.strictEqual(w.hasShadow(), hasShadow)
       })
@@ -2964,7 +2964,7 @@ describe('BrowserWindow module', () => {
         c.close()
       })
       it('disables parent window recursively', () => {
-        let c2 = new BrowserWindow({ show: false, parent: w, modal: true })
+        const c2 = new BrowserWindow({ show: false, parent: w, modal: true })
         c.show()
         assert.strictEqual(w.isEnabled(), false)
         c2.show()
@@ -3435,7 +3435,7 @@ describe('BrowserWindow module', () => {
     it('creates offscreen window with correct size', (done) => {
       w.webContents.once('paint', function (event, rect, data) {
         assert.notStrictEqual(data.length, 0)
-        let size = data.getSize()
+        const size = data.getSize()
         assertWithinDelta(size.width, 100, 2, 'width')
         assertWithinDelta(size.height, 100, 2, 'height')
         done()
@@ -3450,7 +3450,7 @@ describe('BrowserWindow module', () => {
       })
 
       it('is false for regular window', () => {
-        let c = new BrowserWindow({ show: false })
+        const c = new BrowserWindow({ show: false })
         assert.strictEqual(c.webContents.isOffscreen(), false)
         c.destroy()
       })

spec/api-crash-reporter-spec.js

@@ -412,7 +412,7 @@ const waitForCrashReport = () => {
 
 const startServer = ({ callback, processType, done }) => {
   let called = false
-  let server = http.createServer((req, res) => {
+  const server = http.createServer((req, res) => {
     const form = new multiparty.Form()
     form.parse(req, (error, fields) => {
       if (error) throw error

spec/api-deprecations-spec.js

@@ -71,7 +71,7 @@ describe('deprecations', () => {
     deprecations.setHandler(m => { msg = m })
 
     const prop = 'itMustGo'
-    let o = { [prop]: 0 }
+    const o = { [prop]: 0 }
 
     deprecate.removeProperty(o, prop)
 
@@ -88,7 +88,7 @@ describe('deprecations', () => {
 
     const key = 'foo'
     const val = 'bar'
-    let o = { [key]: val }
+    const o = { [key]: val }
     deprecate.removeProperty(o, key)
 
     for (let i = 0; i < 3; ++i) {
@@ -104,7 +104,7 @@ describe('deprecations', () => {
     const oldProp = 'dingyOldName'
     const newProp = 'shinyNewName'
 
-    let o = { [oldProp]: 0 }
+    const o = { [oldProp]: 0 }
     deprecate.renameProperty(o, oldProp, newProp)
 
     expect(msg).to.be.a('string')

spec/api-menu-item-spec.js

@@ -49,10 +49,10 @@ describe('MenuItems', () => {
     })
 
     describe('MenuItem group properties', () => {
-      let template = []
+      const template = []
 
       const findRadioGroups = (template) => {
-        let groups = []
+        const groups = []
         let cur = null
         for (let i = 0; i <= template.length; i++) {
           if (cur && ((i === template.length) || (template[i].type !== 'radio'))) {
@@ -68,7 +68,7 @@ describe('MenuItems', () => {
 
       // returns array of checked menuitems in [begin,end)
       const findChecked = (menuItems, begin, end) => {
-        let checked = []
+        const checked = []
         for (let i = begin; i < end; i++) {
           if (menuItems[i].checked) checked.push(i)
         }
@@ -107,7 +107,7 @@ describe('MenuItems', () => {
       it('should assign groupId automatically', () => {
         const menu = Menu.buildFromTemplate(template)
 
-        let usedGroupIds = new Set()
+        const usedGroupIds = new Set()
         const groups = findRadioGroups(template)
         groups.forEach(g => {
           const groupId = menu.items[g.begin].groupId
@@ -143,7 +143,7 @@ describe('MenuItems', () => {
   describe('MenuItem role execution', () => {
     it('does not try to execute roles without a valid role property', () => {
       let win = new BrowserWindow({ show: false, width: 200, height: 200 })
-      let item = new MenuItem({ role: 'asdfghjkl' })
+      const item = new MenuItem({ role: 'asdfghjkl' })
 
       const canExecute = roles.execute(item.role, win, win.webContents)
       expect(canExecute).to.be.false()
@@ -153,7 +153,7 @@ describe('MenuItems', () => {
 
     it('executes roles with native role functions', () => {
       let win = new BrowserWindow({ show: false, width: 200, height: 200 })
-      let item = new MenuItem({ role: 'reload' })
+      const item = new MenuItem({ role: 'reload' })
 
       const canExecute = roles.execute(item.role, win, win.webContents)
       expect(canExecute).to.be.true()
@@ -163,7 +163,7 @@ describe('MenuItems', () => {
 
     it('execute roles with non-native role functions', () => {
       let win = new BrowserWindow({ show: false, width: 200, height: 200 })
-      let item = new MenuItem({ role: 'resetzoom' })
+      const item = new MenuItem({ role: 'resetzoom' })
 
       const canExecute = roles.execute(item.role, win, win.webContents)
       expect(canExecute).to.be.true()
@@ -229,7 +229,7 @@ describe('MenuItems', () => {
         'zoomout'
       ]
 
-      for (let role in roleList) {
+      for (const role in roleList) {
         const item = new MenuItem({ role })
         expect(item.getDefaultRoleAccelerator()).to.be.undefined()
       }
@@ -258,7 +258,7 @@ describe('MenuItems', () => {
         'zoomout': 'Zoom Out'
       }
 
-      for (let role in roleList) {
+      for (const role in roleList) {
         const item = new MenuItem({ role })
         expect(item.label).to.equal(roleList[role])
       }
@@ -287,7 +287,7 @@ describe('MenuItems', () => {
         'zoomout': 'CommandOrControl+-'
       }
 
-      for (let role in roleList) {
+      for (const role in roleList) {
         const item = new MenuItem({ role })
         expect(item.getDefaultRoleAccelerator()).to.equal(roleList[role])
       }

spec/api-net-log-spec.js

@@ -97,7 +97,7 @@ describe('netLog module', () => {
       return
     }
 
-    let appProcess = ChildProcess.spawn(remote.process.execPath,
+    const appProcess = ChildProcess.spawn(remote.process.execPath,
       [appPath, `--log-net-log=${dumpFile}`], {
         env: {
           TEST_REQUEST_URL: server.url
@@ -116,7 +116,7 @@ describe('netLog module', () => {
       return
     }
 
-    let appProcess = ChildProcess.spawn(remote.process.execPath,
+    const appProcess = ChildProcess.spawn(remote.process.execPath,
       [appPath, `--log-net-log=${dumpFile}`], {
         env: {
           TEST_REQUEST_URL: server.url,
@@ -142,7 +142,7 @@ describe('netLog module', () => {
       return
     }
 
-    let appProcess = ChildProcess.spawn(remote.process.execPath,
+    const appProcess = ChildProcess.spawn(remote.process.execPath,
       [appPath], {
         env: {
           TEST_REQUEST_URL: server.url,

spec/api-net-spec.js

@@ -12,7 +12,7 @@ const { session } = remote
 function randomBuffer (size, start, end) {
   start = start || 0
   end = end || 255
-  let range = 1 + end - start
+  const range = 1 + end - start
   const buffer = Buffer.allocUnsafe(size)
   for (let i = 0; i < size; ++i) {
     buffer[i] = start + Math.floor(Math.random() * range)
@@ -21,7 +21,7 @@ function randomBuffer (size, start, end) {
 }
 
 function randomString (length) {
-  let buffer = randomBuffer(length, '0'.charCodeAt(0), 'z'.charCodeAt(0))
+  const buffer = randomBuffer(length, '0'.charCodeAt(0), 'z'.charCodeAt(0))
   return buffer.toString()
 }
 
@@ -209,8 +209,8 @@ describe('net module', () => {
 
       let chunkIndex = 0
       const chunkCount = 100
-      let sentChunks = []
+      const sentChunks = []
-      let receivedChunks = []
+      const receivedChunks = []
       urlRequest.on('response', (response) => {
         assert.strictEqual(response.statusCode, 200)
         response.pause()
@@ -218,8 +218,8 @@ describe('net module', () => {
           receivedChunks.push(chunk)
         })
         response.on('end', () => {
-          let sentData = Buffer.concat(sentChunks)
+          const sentData = Buffer.concat(sentChunks)
-          let receivedData = Buffer.concat(receivedChunks)
+          const receivedData = Buffer.concat(receivedChunks)
           assert.strictEqual(sentData.toString(), receivedData.toString())
           assert.strictEqual(chunkIndex, chunkCount)
           done()
@@ -285,14 +285,14 @@ describe('net module', () => {
         requestResponseEventEmitted = true
         const statusCode = response.statusCode
         assert.strictEqual(statusCode, 200)
-        let buffers = []
+        const buffers = []
         response.pause()
         response.on('data', (chunk) => {
           buffers.push(chunk)
           responseDataEventEmitted = true
         })
         response.on('end', () => {
-          let receivedBodyData = Buffer.concat(buffers)
+          const receivedBodyData = Buffer.concat(buffers)
           assert(receivedBodyData.toString() === bodyData)
           responseEndEventEmitted = true
           maybeDone(done)
@@ -907,7 +907,7 @@ describe('net module', () => {
         assert.fail('Request should not be intercepted by the default session')
       })
 
-      let customSession = session.fromPartition(customPartitionName, { cache: false })
+      const customSession = session.fromPartition(customPartitionName, { cache: false })
       let requestIsIntercepted = false
       customSession.webRequest.onBeforeRequest((details, callback) => {
         if (details.url === `${server.url}${requestUrl}`) {
@@ -1189,7 +1189,7 @@ describe('net module', () => {
         assert.fail('Request should not be intercepted by the default session')
       })
 
-      let customSession = session.fromPartition(customPartitionName, {
+      const customSession = session.fromPartition(customPartitionName, {
         cache: false
       })
       let requestIsIntercepted = false
@@ -1260,7 +1260,7 @@ describe('net module', () => {
       })
 
       const serverUrl = url.parse(server.url)
-      let options = {
+      const options = {
         port: serverUrl.port,
         hostname: '127.0.0.1',
         headers: {}
@@ -1312,7 +1312,7 @@ describe('net module', () => {
         }
       })
 
-      let nodeRequest = http.request(`${server.url}${nodeRequestUrl}`)
+      const nodeRequest = http.request(`${server.url}${nodeRequestUrl}`)
       nodeRequest.on('response', (nodeResponse) => {
         const netRequest = net.request(`${server.url}${netRequestUrl}`)
         netRequest.on('response', (netResponse) => {
@@ -1470,7 +1470,7 @@ describe('net module', () => {
 
     it('should not emit any event after close', (done) => {
       const requestUrl = '/requestUrl'
-      let bodyData = randomString(kOneKiloByte)
+      const bodyData = randomString(kOneKiloByte)
       server.on('request', (request, response) => {
         switch (request.url) {
           case requestUrl:

spec/api-notification-dbus-spec.js

@@ -62,10 +62,10 @@ const skip = process.platform !== 'linux' ||
     }
 
     function unmarshalDBusNotifyHints (dbusHints) {
-      let o = {}
+      const o = {}
-      for (let hint of dbusHints) {
+      for (const hint of dbusHints) {
-        let key = hint[0]
+        const key = hint[0]
-        let value = hint[1][1][0]
+        const value = hint[1][1][0]
         o[key] = value
       }
       return o
@@ -102,11 +102,11 @@ const skip = process.platform !== 'linux' ||
       const calls = await getCalls()
       expect(calls).to.be.an('array').of.lengthOf.at.least(1)
 
-      let lastCall = calls[calls.length - 1]
+      const lastCall = calls[calls.length - 1]
-      let methodName = lastCall[1]
+      const methodName = lastCall[1]
       expect(methodName).to.equal('Notify')
 
-      let args = unmarshalDBusNotifyArgs(lastCall[2])
+      const args = unmarshalDBusNotifyArgs(lastCall[2])
       expect(args).to.deep.equal({
         app_name: appName,
         replaces_id: 0,

spec/api-protocol-spec.js

@@ -1036,7 +1036,7 @@ describe('protocol module', () => {
     })
 
     it('can access files through the FileSystem API', (done) => {
-      let filePath = path.join(__dirname, 'fixtures', 'pages', 'filesystem.html')
+      const filePath = path.join(__dirname, 'fixtures', 'pages', 'filesystem.html')
       const handler = (request, callback) => callback({ path: filePath })
       protocol.registerFileProtocol(standardScheme, handler, (error) => {
         if (error) return done(error)
@@ -1047,7 +1047,7 @@ describe('protocol module', () => {
     })
 
     it('registers secure, when {secure: true}', (done) => {
-      let filePath = path.join(__dirname, 'fixtures', 'pages', 'cache-storage.html')
+      const filePath = path.join(__dirname, 'fixtures', 'pages', 'cache-storage.html')
       const handler = (request, callback) => callback({ path: filePath })
       ipcMain.once('success', () => done())
       ipcMain.once('failure', (event, err) => done(err))

spec/api-remote-spec.js

@@ -228,7 +228,7 @@ describe('remote module', () => {
     })
 
     it('is referenced by its members', () => {
-      let stringify = remote.getGlobal('JSON').stringify
+      const stringify = remote.getGlobal('JSON').stringify
       global.gc()
       stringify({})
     })
@@ -451,13 +451,13 @@ describe('remote module', () => {
       assert.strictEqual(derived.method(), 'method')
       assert.strictEqual(derived.readonly, 'readonly')
       assert(!derived.hasOwnProperty('method'))
-      let proto = Object.getPrototypeOf(derived)
+      const proto = Object.getPrototypeOf(derived)
       assert(!proto.hasOwnProperty('method'))
       assert(Object.getPrototypeOf(proto).hasOwnProperty('method'))
     })
 
     it('is referenced by methods in prototype chain', () => {
-      let method = derived.method
+      const method = derived.method
       derived = null
       global.gc()
       assert.strictEqual(method(), 'method')
@@ -474,7 +474,7 @@ describe('remote module', () => {
     })
 
     it('throws custom errors from the main process', () => {
-      let err = new Error('error')
+      const err = new Error('error')
       err.cause = new Error('cause')
       err.prop = 'error prop'
       try {

spec/api-session-spec.js

@@ -537,7 +537,7 @@ describe('session module', () => {
         if (request.method === 'GET') {
           callback({ data: content, mimeType: 'text/html' })
         } else if (request.method === 'POST') {
-          let uuid = request.uploadData[1].blobUUID
+          const uuid = request.uploadData[1].blobUUID
           assert(uuid)
           session.defaultSession.getBlobData(uuid, (result) => {
             assert.strictEqual(result.toString(), postData)
@@ -648,7 +648,7 @@ describe('session module', () => {
       const fixtures = path.join(__dirname, 'fixtures')
       const downloadFilePath = path.join(fixtures, 'logo.png')
       const rangeServer = http.createServer((req, res) => {
-        let options = { root: fixtures }
+        const options = { root: fixtures }
         send(req, req.url, options)
           .on('error', (error) => { done(error) }).pipe(res)
       })

spec/api-system-preferences-spec.js

@@ -11,7 +11,7 @@ describe('systemPreferences module', () => {
     })
 
     it('should return a non-empty string', () => {
-      let accentColor = systemPreferences.getAccentColor()
+      const accentColor = systemPreferences.getAccentColor()
       assert.notStrictEqual(accentColor, null)
       assert(accentColor.length > 0)
     })

spec/api-web-contents-spec.js

@@ -103,7 +103,7 @@ describe('webContents module', () => {
 
   describe('setDevToolsWebContents() API', () => {
     it('sets arbitry webContents as devtools', (done) => {
-      let devtools = new BrowserWindow({ show: false })
+      const devtools = new BrowserWindow({ show: false })
       devtools.webContents.once('dom-ready', () => {
         assert.ok(devtools.getURL().startsWith('chrome-devtools://devtools'))
         devtools.webContents.executeJavaScript('InspectorFrontendHost.constructor.name', (name) => {
@@ -756,7 +756,7 @@ describe('webContents module', () => {
         }
       }
 
-      let gen = genNavigationEvent()
+      const gen = genNavigationEvent()
       ipcRenderer.on(responseEvent, () => {
         if (!gen.next().value) done()
       })

spec/chromium-spec.js

@@ -34,7 +34,7 @@ describe('chromium feature', () => {
         const appPath = path.join(__dirname, 'fixtures', 'api', 'locale-check')
         const electronPath = remote.getGlobal('process').execPath
         let output = ''
-        let appProcess = ChildProcess.spawn(electronPath, [appPath, `--lang=${locale}`])
+        const appProcess = ChildProcess.spawn(electronPath, [appPath, `--lang=${locale}`])
 
         appProcess.stdout.on('data', (data) => { output += data })
         appProcess.stdout.on('end', () => {
@@ -175,7 +175,7 @@ describe('chromium feature', () => {
 
   describe('navigator.languages', (done) => {
     it('should return the system locale only', () => {
-      let appLocale = app.getLocale()
+      const appLocale = app.getLocale()
       assert.strictEqual(navigator.languages.length, 1)
       assert.strictEqual(navigator.languages[0], appLocale)
     })
@@ -294,7 +294,7 @@ describe('chromium feature', () => {
     })
 
     it('accepts "nodeIntegration" as feature', (done) => {
-      let b
+      let b = null
       listener = (event) => {
         assert.strictEqual(event.data.isProcessGlobalUndefined, true)
         b.close()
@@ -305,7 +305,7 @@ describe('chromium feature', () => {
     })
 
     it('inherit options of parent window', (done) => {
-      let b
+      let b = null
       listener = (event) => {
         const ref1 = remote.getCurrentWindow().getSize()
         const width = ref1[0]
@@ -339,7 +339,7 @@ describe('chromium feature', () => {
     }
 
     it('disables node integration when it is disabled on the parent window', (done) => {
-      let b
+      let b = null
       listener = (event) => {
         assert.strictEqual(event.data.isProcessGlobalUndefined, true)
         b.close()
@@ -359,7 +359,7 @@ describe('chromium feature', () => {
     })
 
     it('disables webviewTag when node integration is disabled on the parent window', (done) => {
-      let b
+      let b = null
       listener = (event) => {
         assert.strictEqual(event.data.isWebViewUndefined, true)
         b.close()
@@ -380,7 +380,7 @@ describe('chromium feature', () => {
 
     // TODO(codebytere): re-enable this test
     xit('disables node integration when it is disabled on the parent window for chrome devtools URLs', (done) => {
-      let b
+      let b = null
       app.once('web-contents-created', (event, contents) => {
         contents.once('did-finish-load', () => {
           contents.executeJavaScript('typeof process').then((typeofProcessGlobal) => {
@@ -394,7 +394,7 @@ describe('chromium feature', () => {
     })
 
     it('disables JavaScript when it is disabled on the parent window', (done) => {
-      let b
+      let b = null
       app.once('web-contents-created', (event, contents) => {
         contents.once('did-finish-load', () => {
           app.once('browser-window-created', (event, window) => {
@@ -419,7 +419,7 @@ describe('chromium feature', () => {
     })
 
     it('disables the <webview> tag when it is disabled on the parent window', (done) => {
-      let b
+      let b = null
       listener = (event) => {
         assert.strictEqual(event.data.isWebViewGlobalUndefined, true)
         b.close()
@@ -439,7 +439,7 @@ describe('chromium feature', () => {
     })
 
     it('does not override child options', (done) => {
-      let b
+      let b = null
       const size = {
         width: 350,
         height: 450
@@ -476,7 +476,7 @@ describe('chromium feature', () => {
     })
 
     it('defines a window.location getter', (done) => {
-      let b
+      let b = null
       let targetURL
       if (process.platform === 'win32') {
         targetURL = `file:///${fixtures.replace(/\\/g, '/')}/pages/base-page.html`
@@ -494,7 +494,7 @@ describe('chromium feature', () => {
     })
 
     it('defines a window.location setter', (done) => {
-      let b
+      let b = null
       app.once('browser-window-created', (event, { webContents }) => {
         webContents.once('did-finish-load', () => {
           // When it loads, redirect
@@ -510,14 +510,14 @@ describe('chromium feature', () => {
     })
 
     it('open a blank page when no URL is specified', (done) => {
-      let b
+      let b = null
       app.once('browser-window-created', (event, { webContents }) => {
         webContents.once('did-finish-load', () => {
           const { location } = b
           b.close()
           assert.strictEqual(location, 'about:blank')
 
-          let c
+          let c = null
           app.once('browser-window-created', (event, { webContents }) => {
             webContents.once('did-finish-load', () => {
               const { location } = c
@@ -543,7 +543,7 @@ describe('chromium feature', () => {
     })
 
     it('sets the window title to the specified frameName', (done) => {
-      let b
+      let b = null
       app.once('browser-window-created', (event, createdWindow) => {
         assert.strictEqual(createdWindow.getTitle(), 'hello')
         b.close()
@@ -553,7 +553,7 @@ describe('chromium feature', () => {
     })
 
     it('does not throw an exception when the frameName is a built-in object property', (done) => {
-      let b
+      let b = null
       app.once('browser-window-created', (event, createdWindow) => {
         assert.strictEqual(createdWindow.getTitle(), '__proto__')
         b.close()
@@ -563,7 +563,7 @@ describe('chromium feature', () => {
     })
 
     it('does not throw an exception when the features include webPreferences', () => {
-      let b
+      let b = null
       assert.doesNotThrow(() => {
         b = window.open('', '', 'webPreferences=')
       })
@@ -572,7 +572,7 @@ describe('chromium feature', () => {
   })
 
   describe('window.opener', () => {
-    let url = `file://${fixtures}/pages/window-opener.html`
+    const url = `file://${fixtures}/pages/window-opener.html`
     it('is null for main window', (done) => {
       w = new BrowserWindow({ show: false })
       w.webContents.once('ipc-message', (event, args) => {
@@ -583,7 +583,7 @@ describe('chromium feature', () => {
     })
 
     it('is not null for window opened by window.open', (done) => {
-      let b
+      let b = null
       listener = (event) => {
         assert.strictEqual(event.data, 'object')
         b.close()
@@ -596,7 +596,7 @@ describe('chromium feature', () => {
 
   describe('window.opener access from BrowserWindow', () => {
     const scheme = 'other'
-    let url = `${scheme}://${fixtures}/pages/window-opener-location.html`
+    const url = `${scheme}://${fixtures}/pages/window-opener-location.html`
     let w = null
 
     before((done) => {
@@ -720,7 +720,7 @@ describe('chromium feature', () => {
 
   describe('window.postMessage', () => {
     it('sets the source and origin correctly', (done) => {
-      let b
+      let b = null
       listener = (event) => {
         window.removeEventListener('message', listener)
         b.close()
@@ -751,7 +751,7 @@ describe('chromium feature', () => {
 
   describe('window.opener.postMessage', () => {
     it('sets source and origin correctly', (done) => {
-      let b
+      let b = null
       listener = (event) => {
         window.removeEventListener('message', listener)
         b.close()
@@ -803,7 +803,7 @@ describe('chromium feature', () => {
       })
 
       it('delivers messages that match the origin', (done) => {
-        let b
+        let b = null
         listener = (event) => {
           window.removeEventListener('message', listener)
           b.close()
@@ -856,7 +856,7 @@ describe('chromium feature', () => {
     })
 
     it('Worker has no node integration by default', (done) => {
-      let worker = new Worker('../fixtures/workers/worker_node.js')
+      const worker = new Worker('../fixtures/workers/worker_node.js')
       worker.onmessage = (event) => {
         assert.strictEqual(event.data, 'undefined undefined undefined undefined')
         worker.terminate()
@@ -865,7 +865,7 @@ describe('chromium feature', () => {
     })
 
     it('Worker has node integration with nodeIntegrationInWorker', (done) => {
-      let webview = new WebView()
+      const webview = new WebView()
       webview.addEventListener('ipc-message', (e) => {
         assert.strictEqual(e.channel, 'object function object function')
         webview.remove()
@@ -887,7 +887,7 @@ describe('chromium feature', () => {
     })
 
     it('SharedWorker has no node integration by default', (done) => {
-      let worker = new SharedWorker('../fixtures/workers/shared_worker_node.js')
+      const worker = new SharedWorker('../fixtures/workers/shared_worker_node.js')
       worker.port.onmessage = (event) => {
         assert.strictEqual(event.data, 'undefined undefined undefined undefined')
         done()
@@ -895,7 +895,7 @@ describe('chromium feature', () => {
     })
 
     it('SharedWorker has node integration with nodeIntegrationInWorker', (done) => {
-      let webview = new WebView()
+      const webview = new WebView()
       webview.addEventListener('console-message', (e) => {
         console.log(e)
       })
@@ -944,7 +944,7 @@ describe('chromium feature', () => {
       let contents = null
       before((done) => {
         const handler = (request, callback) => {
-          let parsedUrl = url.parse(request.url)
+          const parsedUrl = url.parse(request.url)
           let filename
           switch (parsedUrl.pathname) {
             case '/localStorage' : filename = 'local_storage.html'; break

spec/fixtures/api/mixed-sandbox-app/main.js

@@ -15,7 +15,7 @@ let currentWindowSandboxed = false
 app.once('ready', () => {
   function testWindow (isSandboxed, callback) {
     currentWindowSandboxed = isSandboxed
-    let currentWindow = new BrowserWindow({
+    const currentWindow = new BrowserWindow({
       show: false,
       webPreferences: {
         preload: path.join(__dirname, 'electron-app-mixed-sandbox-preload.js'),

spec/fixtures/api/relaunch/main.js

@@ -8,7 +8,7 @@ process.on('uncaughtException', () => {
 })
 
 app.once('ready', () => {
-  let lastArg = process.argv[process.argv.length - 1]
+  const lastArg = process.argv[process.argv.length - 1]
   const client = net.connect(socketPath)
   client.once('connect', () => {
     client.end(String(lastArg === '--second'))

spec/fixtures/workers/shared_worker_node.js

@@ -1,5 +1,5 @@
 self.onconnect = function (event) {
-  let port = event.ports[0]
+  const port = event.ports[0]
   port.start()
   port.postMessage([typeof process, typeof setImmediate, typeof global, typeof Buffer].join(' '))
 }

spec/modules-spec.js

@@ -131,7 +131,7 @@ describe('modules support', () => {
 
     describe('when the path is outside the resources path', () => {
       it('includes paths outside of the resources path', () => {
-        let modulePath = path.resolve('/foo')
+        const modulePath = path.resolve('/foo')
         assert.deepStrictEqual(Module._nodeModulePaths(modulePath), [
           path.join(modulePath, 'node_modules'),
           path.resolve('/node_modules')

spec/node-spec.js

@@ -331,10 +331,10 @@ describe('node feature', () => {
       const key = 'q90K9yBqhWZnAMCMTOJfPQ=='
       const cipherText = '{"error_code":114,"error_message":"Tham số không hợp lệ","data":null}'
       for (let i = 0; i < 10000; ++i) {
-        let iv = Buffer.from('0'.repeat(32), 'hex')
+        const iv = Buffer.from('0'.repeat(32), 'hex')
-        let input = Buffer.from(data, 'base64')
+        const input = Buffer.from(data, 'base64')
-        let decipher = crypto.createDecipheriv('aes-128-cbc', Buffer.from(key, 'base64'), iv)
+        const decipher = crypto.createDecipheriv('aes-128-cbc', Buffer.from(key, 'base64'), iv)
-        let result = Buffer.concat([decipher.update(input), decipher.final()]).toString('utf8')
+        const result = Buffer.concat([decipher.update(input), decipher.final()]).toString('utf8')
         assert.strictEqual(cipherText, result)
       }
     })

spec/static/main.js

@@ -56,7 +56,7 @@ if (process.platform !== 'darwin') {
 // Write output to file if OUTPUT_TO_FILE is defined.
 const outputToFile = process.env.OUTPUT_TO_FILE
 const print = function (_, args) {
-  let output = util.format.apply(null, args)
+  const output = util.format.apply(null, args)
   if (outputToFile) {
     fs.appendFileSync(outputToFile, output + '\n')
   } else {
@@ -398,7 +398,7 @@ ipcMain.on('test-webcontents-navigation-observer', (event, options) => {
 })
 
 ipcMain.on('test-browserwindow-destroy', (event, testOptions) => {
-  let focusListener = (event, win) => win.id
+  const focusListener = (event, win) => win.id
   app.on('browser-window-focus', focusListener)
   const windowCount = 3
   const windowOptions = {

spec/webview-spec.js

@@ -987,7 +987,7 @@ describe('<webview> tag', function () {
   describe('found-in-page event', () => {
     it('emits when a request is made', (done) => {
       let requestId = null
-      let activeMatchOrdinal = []
+      const activeMatchOrdinal = []
       const listener = (e) => {
         assert.strictEqual(e.result.requestId, requestId)
         assert.strictEqual(e.result.matches, 3)
@@ -1157,7 +1157,7 @@ describe('<webview> tag', function () {
     it('inherits the parent window visibility state and receives visibilitychange events', async () => {
       const w = await openTheWindow({ show: false })
       w.loadFile(path.join(fixtures, 'pages', 'webview-visibilitychange.html'))
-      let [, visibilityState, hidden] = await emittedOnce(ipcMain, 'pong')
+      const [, visibilityState, hidden] = await emittedOnce(ipcMain, 'pong')
       assert.strictEqual(visibilityState, 'hidden')
       assert.strictEqual(hidden, true)