build/*.js: ES6-ify files. (#24112)

build/change-version.js

@@ -11,34 +11,30 @@
 
 /* global Set */
 
-var fs = require('fs')
+const fs = require('fs')
-var path = require('path')
+const path = require('path')
-var sh = require('shelljs')
+const sh = require('shelljs')
 sh.config.fatal = true
-var sed = sh.sed
+const sed = sh.sed
 
 // Blame TC39... https://github.com/benjamingr/RegExp.escape/issues/37
-RegExp.quote = function (string) {
+RegExp.quote = (string) => string.replace(/[-\\^$*+?.()|[\]{}]/g, '\\$&')
-  return string.replace(/[-\\^$*+?.()|[\]{}]/g, '\\$&')
+RegExp.quoteReplacement = (string) => string.replace(/[$]/g, '$$')
-}
-RegExp.quoteReplacement = function (string) {
-  return string.replace(/[$]/g, '$$')
-}
 
-var DRY_RUN = false
+const DRY_RUN = false
 
 function walkAsync(directory, excludedDirectories, fileCallback, errback) {
   if (excludedDirectories.has(path.parse(directory).base)) {
     return
   }
-  fs.readdir(directory, function (err, names) {
+  fs.readdir(directory, (err, names) => {
     if (err) {
       errback(err)
       return
     }
-    names.forEach(function (name) {
+    names.forEach((name) => {
-      var filepath = path.join(directory, name)
+      const filepath = path.join(directory, name)
-      fs.lstat(filepath, function (err, stats) {
+      fs.lstat(filepath, (err, stats) => {
         if (err) {
           process.nextTick(errback, err)
           return
@@ -60,19 +56,19 @@ function walkAsync(directory, excludedDirectories, fileCallback, errback) {
 function replaceRecursively(directory, excludedDirectories, allowedExtensions, original, replacement) {
   original = new RegExp(RegExp.quote(original), 'g')
   replacement = RegExp.quoteReplacement(replacement)
-  var updateFile = !DRY_RUN ? function (filepath) {
+  const updateFile = !DRY_RUN ? (filepath) => {
     if (allowedExtensions.has(path.parse(filepath).ext)) {
       sed('-i', original, replacement, filepath)
     }
-  } : function (filepath) {
+  } : (filepath) => {
     if (allowedExtensions.has(path.parse(filepath).ext)) {
-      console.log('FILE: ' + filepath)
+      console.log(`FILE: ${filepath}`)
     }
     else {
-      console.log('EXCLUDED:' + filepath)
+      console.log(`EXCLUDED:${filepath}`)
     }
   }
-  walkAsync(directory, excludedDirectories, updateFile, function (err) {
+  walkAsync(directory, excludedDirectories, updateFile, (err) => {
     console.error('ERROR while traversing directory!:')
     console.error(err)
     process.exit(1)
@@ -85,14 +81,14 @@ function main(args) {
     console.error('Got arguments:', args)
     process.exit(1)
   }
-  var oldVersion = args[0]
+  const oldVersion = args[0]
-  var newVersion = args[1]
+  const newVersion = args[1]
-  var EXCLUDED_DIRS = new Set([
+  const EXCLUDED_DIRS = new Set([
     '.git',
     'node_modules',
     'vendor'
   ])
-  var INCLUDED_EXTENSIONS = new Set([
+  const INCLUDED_EXTENSIONS = new Set([
     // This extension whitelist is how we avoid modifying binary files
     '',
     '.css',

build/rollup.config.js

@@ -5,8 +5,8 @@ const pkg     = require(path.resolve(__dirname, '../package.json'))
 const BUNDLE  = process.env.BUNDLE === 'true'
 const year    = new Date().getFullYear()
 
-var fileDest  = 'bootstrap.js'
+let fileDest  = 'bootstrap.js'
-var external  = ['jquery', 'popper.js']
+const external  = ['jquery', 'popper.js']
 const plugins = [
   babel({
     exclude: 'node_modules/**', // only transpile our source code