Gruntfile.js

/*!
 * Bootstrap's Gruntfile
 * https://getbootstrap.com
 * Copyright 2013-2016 The Bootstrap Authors
 * Copyright 2013-2016 Twitter, Inc.
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
 */

module.exports = function (grunt) {
  'use strict';

  // Force use of Unix newlines
  grunt.util.linefeed = '\n';

  RegExp.quote = function (string) {
    return string.replace(/[-\\^$*+?.()|[\]{}]/g, '\\$&');
  };

  var fs = require('fs');
  var path = require('path');
  var isTravis = require('is-travis');

  var configBridge = grunt.file.readJSON('./grunt/configBridge.json', { encoding: 'utf8' });

  Object.keys(configBridge.paths).forEach(function (key) {
    configBridge.paths[key].forEach(function (val, i, arr) {
      arr[i] = path.join('./docs', val);
    });
  });

  // Project configuration.
  grunt.initConfig({

    // Metadata.
    pkg: grunt.file.readJSON('package.json'),
    banner: '/*!\n' +
            ' * Bootstrap v<%= pkg.version %> (<%= pkg.homepage %>)\n' +
            ' * Copyright 2011-<%= grunt.template.today("yyyy") %> <%= pkg.author %>\n' +
            ' * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)\n' +
            ' */\n',
    jqueryCheck: 'if (typeof jQuery === \'undefined\') {\n' +
                 '  throw new Error(\'Bootstrap\\\'s JavaScript requires jQuery\')\n' +
                 '}\n',
    jqueryVersionCheck: '+function ($) {\n' +
                        '  var version = $.fn.jquery.split(\' \')[0].split(\'.\')\n' +
                        '  if ((version[0] < 2 && version[1] < 9) || (version[0] == 1 && version[1] == 9 && version[2] < 1) || (version[0] >= 4)) {\n' +
                        '    throw new Error(\'Bootstrap\\\'s JavaScript requires at least jQuery v1.9.1 but less than v4.0.0\')\n' +
                        '  }\n' +
                        '}(jQuery);\n\n',

    // Task configuration.
    clean: {
      dist: 'dist',
      docs: 'docs/dist'
    },

    // JS build configuration
    babel: {
      dev: {
        options: {
          sourceMap: true
        },
        files: {
          'js/dist/util.js'      : 'js/src/util.js',
          'js/dist/alert.js'     : 'js/src/alert.js',
          'js/dist/button.js'    : 'js/src/button.js',
          'js/dist/carousel.js'  : 'js/src/carousel.js',
          'js/dist/collapse.js'  : 'js/src/collapse.js',
          'js/dist/dropdown.js'  : 'js/src/dropdown.js',
          'js/dist/modal.js'     : 'js/src/modal.js',