text: /**
   * Copyright (c) 2015-present, Facebook, Inc.
   *
   * This source code is licensed under the MIT license found in the
   * LICENSE file in the root directory of this source tree.
   */
  
  // This Webpack plugin lets us interpolate custom variables into `index.html`.
  // Usage: `new InterpolateHtmlPlugin({ 'MY_VARIABLE': 42 })`
  // Then, you can use %MY_VARIABLE% in your `index.html`.
  
  // It works in tandem with HtmlWebpackPlugin.
  // Learn more about creating plugins like this:
  // https://github.com/ampedandwired/html-webpack-plugin#events
  
  'use strict'
  const escapeStringRegexp = require('escape-string-regexp')
  
  class InterpolateHtmlPlugin {
    constructor (replacements) {
      this.replacements = replacements
    }
  
    apply (compiler) {
      compiler.hooks.compilation.tap('InterpolateHtmlPlugin', compilation => {
        compilation.hooks.htmlWebpackPluginBeforeHtmlProcessing.tap(
          'InterpolateHtmlPlugin',
          data => {
            // Run HTML through a series of user-specified string replacements.
            Object.keys(this.replacements).forEach(key => {
              const value = this.replacements[key]
              data.html = data.html.replace(
                new RegExp('%' + escapeStringRegexp(key) + '%', 'g'),
                value
              )
            })
          }
        )
      })
    }
  }
  
  module.exports = InterpolateHtmlPlugin
  