[nodejs] code cleanup first iteration

javascript/node/selenium-webdriver/io/exec.js

@@ -121,9 +121,9 @@ class Command {
  * @return {!Command} The launched command.
  */
 module.exports = function exec(command, opt_options) {
-  var options = opt_options || {}
+  const options = opt_options || {}
 
-  var proc = childProcess.spawn(command, options.args || [], {
+  let proc = childProcess.spawn(command, options.args || [], {
     env: options.env || process.env,
     stdio: options.stdio || 'ignore',
   })
@@ -133,7 +133,7 @@ module.exports = function exec(command, opt_options) {
   proc.unref()
   process.once('exit', onProcessExit)
 
-  let result = new Promise((resolve) => {
+  const result = new Promise((resolve) => {
     proc.once('exit', (code, signal) => {
       proc = null
       process.removeListener('exit', onProcessExit)

javascript/node/selenium-webdriver/io/index.js

@@ -204,13 +204,12 @@ exports.tmpDir = function () {
  */
 exports.tmpFile = function (opt_options) {
   return checkedCall((callback) => {
-    // |tmp.file| checks arguments length to detect options rather than doing a
-    // truthy check, so we must only pass options if there are some to pass.
-    if (opt_options) {
-      tmp.file(opt_options, callback)
-    } else {
-      tmp.file(callback)
-    }
+    /**  check fixed in v > 0.2.1 if
+     * (typeof options === 'function') {
+     *     return [{}, options];
+     * }
+     */
+    tmp.file(opt_options, callback)
   })
 }
 
@@ -224,7 +223,7 @@ exports.tmpFile = function (opt_options) {
  *     not be found.
  */
 exports.findInPath = function (file, opt_checkCwd) {
-  let dirs = []
+  const dirs = []
   if (opt_checkCwd) {
     dirs.push(process.cwd())
   }
@@ -329,7 +328,7 @@ exports.mkdirp = function mkdirp(dir) {
  *     will be relative to `rootPath`.
  */
 exports.walkDir = function (rootPath) {
-  let seen = []
+  const seen = []
   return (function walk(dir) {
     return checkedCall((callback) => fs.readdir(dir, callback)).then((files) =>
       Promise.all(

javascript/node/selenium-webdriver/io/zip.js

@@ -180,8 +180,8 @@ function load(path) {
  */
 function unzip(src, dst) {
   return load(src).then((zip) => {
-    let promisedDirs = new Map()
-    let promises = []
+    const promisedDirs = new Map()
+    const promises = []
 
     zip.z_.forEach((relPath, file) => {
       let p
@@ -218,7 +218,6 @@ function unzip(src, dst) {
 }
 
 // PUBLIC API
-
-exports.Zip = Zip
-exports.load = load
-exports.unzip = unzip
+module.exports.Zip = Zip
+module.exports.load = load
+module.exports.unzip = unzip

javascript/node/selenium-webdriver/lib/actions.js

@@ -342,7 +342,7 @@ class LegacyActionSequence {
    * @private
    */
   scheduleKeyboardAction_(description, keys) {
-    let cmd = new command.Command(
+    const cmd = new command.Command(
       command.Name.LEGACY_ACTION_SEND_KEYS
     ).setParameter('value', keys)
     this.schedule_(description, cmd)

javascript/node/selenium-webdriver/lib/promise.js

@@ -30,17 +30,7 @@
  * @return {boolean} Whether the value is a promise.
  */
 function isPromise(value) {
-  try {
-    // Use array notation so the Closure compiler does not obfuscate away our
-    // contract.
-    return (
-      value &&
-      (typeof value === 'object' || typeof value === 'function') &&
-      typeof value['then'] === 'function'
-    )
-  } catch (ex) {
-    return false
-  }
+  return Object.prototype.toString.call(value) === '[object Promise]'
 }
 
 /**
@@ -50,9 +40,7 @@ function isPromise(value) {
  * @return {!Promise<void>} The promise.
  */
 function delayed(ms) {
-  return new Promise((resolve) => {
-    setTimeout(resolve, ms)
-  })
+  return new Promise((resolve) => setTimeout(resolve, ms))
 }
 
 /**
@@ -199,8 +187,8 @@ async function filter(array, fn, self = undefined) {
 
   for (let i = 0; i < n; i++) {
     if (i in arr) {
-      let value = arr[i]
-      let include = await fn.call(self, value, i, arr)
+      const value = arr[i]
+      const include = await fn.call(self, value, i, arr)
       if (include) {
         values[valuesLength++] = value
       }

javascript/node/selenium-webdriver/remote/index.js

@@ -210,16 +210,16 @@ class DriverService {
           }
 
           return resolveCommandLineFlags(this.args_).then((args) => {
-            var command = exec(self.executable_, {
+            const command = exec(self.executable_, {
               args: args,
               env: self.env_,
               stdio: self.stdio_,
             })
 
             resolveCommand(command)
 
-            var earlyTermination = command.result().then(function (result) {
-              var error =
+            const earlyTermination = command.result().then(function (result) {
+              const error =
                 result.code == null
                   ? Error('Server was killed with ' + result.signal)
                   : Error('Server terminated early with status ' + result.code)
@@ -229,7 +229,7 @@ class DriverService {
               throw error
             })
 
-            var hostname = self.hostname_
+            let hostname = self.hostname_
             if (!hostname) {
               hostname =
                 (!self.loopbackOnly_ && net.getAddress()) ||
@@ -338,9 +338,8 @@ DriverService.Builder = class {
    * @this {THIS}
    * @template THIS
    */
-  addArguments(var_args) { // eslint-disable-line
-    let args = Array.prototype.slice.call(arguments, 0)
-    this.options_.args = this.options_.args.concat(args)
+  addArguments(...arguments_) {
+    this.options_.args = this.options_.args.concat(arguments_)
     return this
   }
 

javascript/node/selenium-webdriver/test/actions_test.js

@@ -54,31 +54,31 @@ test.suite(function (env) {
       await driver.get(fileServer.whereIs('/data/actions/click.html'))
 
       let box = await driver.findElement(By.id('box'))
-      assert.equal(await box.getAttribute('class'), '')
+      assert.strictEqual(await box.getAttribute('class'), '')
 
       await driver.actions().click(box).perform()
-      assert.equal(await box.getAttribute('class'), 'green')
+      assert.strictEqual(await box.getAttribute('class'), 'green')
     })
 
     it('click(element) clicks in center of element', async function () {
       await driver.get(fileServer.whereIs('/data/actions/record_click.html'))
 
       const div = await driver.findElement(By.css('div'))
       const rect = await div.getRect()
-      assert.deepEqual(rect, { width: 500, height: 500, x: 0, y: 0 })
+      assert.deepStrictEqual(rect, { width: 500, height: 500, x: 0, y: 0 })
 
       await driver.actions().click(div).perform()
 
       const clicks = await driver.executeScript('return clicks')
-      assert.deepEqual(clicks, [[250, 250]])
+      assert.deepStrictEqual(clicks, [[250, 250]])
     })
 
     it('can move relative to element center', async function () {
       await driver.get(fileServer.whereIs('/data/actions/record_click.html'))
 
       const div = await driver.findElement(By.css('div'))
       const rect = await div.getRect()
-      assert.deepEqual(rect, { width: 500, height: 500, x: 0, y: 0 })
+      assert.deepStrictEqual(rect, { width: 500, height: 500, x: 0, y: 0 })
 
       await driver
         .actions()
@@ -87,7 +87,7 @@ test.suite(function (env) {
         .perform()
 
       const clicks = await driver.executeScript('return clicks')
-      assert.deepEqual(clicks, [[260, 260]])
+      assert.deepStrictEqual(clicks, [[260, 260]])
     })
 
     test
@@ -96,10 +96,10 @@ test.suite(function (env) {
         await driver.get(fileServer.whereIs('/data/actions/click.html'))
 
         let box = await driver.findElement(By.id('box'))
-        assert.equal(await box.getAttribute('class'), '')
+        assert.strictEqual(await box.getAttribute('class'), '')
 
         await driver.actions().doubleClick(box).perform()
-        assert.equal(await box.getAttribute('class'), 'blue')
+        assert.strictEqual(await box.getAttribute('class'), 'blue')
       })
 
     // For some reason for Chrome 75 we need to wrap this test in an extra
@@ -112,27 +112,27 @@ test.suite(function (env) {
         await driver.get(fileServer.whereIs('/data/actions/drag.html'))
 
         let slide = await driver.findElement(By.id('slide'))
-        assert.equal(await slide.getCssValue('left'), '0px')
-        assert.equal(await slide.getCssValue('top'), '0px')
+        assert.strictEqual(await slide.getCssValue('left'), '0px')
+        assert.strictEqual(await slide.getCssValue('top'), '0px')
 
         let br = await driver.findElement(By.id('BR'))
         await driver.actions().dragAndDrop(slide, br).perform()
-        assert.equal(await slide.getCssValue('left'), '206px')
-        assert.equal(await slide.getCssValue('top'), '206px')
+        assert.strictEqual(await slide.getCssValue('left'), '206px')
+        assert.strictEqual(await slide.getCssValue('top'), '206px')
 
         let tr = await driver.findElement(By.id('TR'))
         await driver.actions().dragAndDrop(slide, tr).perform()
-        assert.equal(await slide.getCssValue('left'), '206px')
-        assert.equal(await slide.getCssValue('top'), '1px')
+        assert.strictEqual(await slide.getCssValue('left'), '206px')
+        assert.strictEqual(await slide.getCssValue('top'), '1px')
       })
     })
 
     it('move()', async function () {
       await driver.get(fileServer.whereIs('/data/actions/drag.html'))
 
       let slide = await driver.findElement(By.id('slide'))
-      assert.equal(await slide.getCssValue('left'), '0px')
-      assert.equal(await slide.getCssValue('top'), '0px')
+      assert.strictEqual(await slide.getCssValue('left'), '0px')
+      assert.strictEqual(await slide.getCssValue('top'), '0px')
 
       await driver
         .actions()
@@ -141,8 +141,8 @@ test.suite(function (env) {
         .move({ x: 100, y: 100, origin: Origin.POINTER })
         .release()
         .perform()
-      assert.equal(await slide.getCssValue('left'), '101px')
-      assert.equal(await slide.getCssValue('top'), '101px')
+      assert.strictEqual(await slide.getCssValue('left'), '101px')
+      assert.strictEqual(await slide.getCssValue('top'), '101px')
     })
 
     it('can move to and click element in an iframe', async function () {
@@ -163,33 +163,33 @@ test.suite(function (env) {
       await driver.get(test.Pages.formPage)
 
       let el = await driver.findElement(By.id('email'))
-      assert.equal(await el.getAttribute('value'), '')
+      assert.strictEqual(await el.getAttribute('value'), '')
 
       await driver.executeScript('arguments[0].focus()', el)
 
       await driver.actions().sendKeys('foobar').perform()
 
-      assert.equal(await el.getAttribute('value'), 'foobar')
+      assert.strictEqual(await el.getAttribute('value'), 'foobar')
     })
 
     it('can get the property of element', async function () {
       await driver.get(test.Pages.formPage)
 
       let el = await driver.findElement(By.id('email'))
-      assert.equal(await el.getProperty('value'), '')
+      assert.strictEqual(await el.getProperty('value'), '')
 
       await driver.executeScript('arguments[0].focus()', el)
 
       await driver.actions().sendKeys('foobar').perform()
 
-      assert.equal(await el.getProperty('value'), 'foobar')
+      assert.strictEqual(await el.getProperty('value'), 'foobar')
     })
 
     it('can send keys to focused element (with modifiers)', async function () {
       await driver.get(test.Pages.formPage)
 
       let el = await driver.findElement(By.id('email'))
-      assert.equal(await el.getAttribute('value'), '')
+      assert.strictEqual(await el.getAttribute('value'), '')
 
       await driver.executeScript('arguments[0].focus()', el)
 
@@ -202,18 +202,18 @@ test.suite(function (env) {
         .sendKeys('ar')
         .perform()
 
-      assert.equal(await el.getAttribute('value'), 'foOBar')
+      assert.strictEqual(await el.getAttribute('value'), 'foOBar')
     })
 
     it('can interact with simple form elements', async function () {
       await driver.get(test.Pages.formPage)
 
       let el = await driver.findElement(By.id('email'))
-      assert.equal(await el.getAttribute('value'), '')
+      assert.strictEqual(await el.getAttribute('value'), '')
 
       await driver.actions().click(el).sendKeys('foobar').perform()
 
-      assert.equal(await el.getAttribute('value'), 'foobar')
+      assert.strictEqual(await el.getAttribute('value'), 'foobar')
     })
   })
 })

javascript/node/selenium-webdriver/test/builder_test.js

@@ -53,7 +53,7 @@ test.suite(function (env) {
           driver instanceof want,
           `want ${want.name}, but got ${driver.name}`
         )
-        assert.equal(typeof driver.then, 'function')
+        assert.strictEqual(typeof driver.then, 'function')
 
         return (
           driver