1 | /**
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2 | * Copyright (c) 2015-present, Facebook, Inc.
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3 | *
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4 | * This source code is licensed under the MIT license found in the
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5 | * LICENSE file in the root directory of this source tree.
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6 | */
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7 |
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8 | // This webpack plugin lets us interpolate custom variables into `index.html`.
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9 | // Usage: `new InterpolateHtmlPlugin(HtmlWebpackPlugin, { 'MY_VARIABLE': 42 })`
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10 | // Then, you can use %MY_VARIABLE% in your `index.html`.
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11 |
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12 | // It works in tandem with HtmlWebpackPlugin.
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13 | // Learn more about creating plugins like this:
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14 | // https://github.com/ampedandwired/html-webpack-plugin#events
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15 |
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16 | ;
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17 | const escapeStringRegexp = require('escape-string-regexp');
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18 |
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19 | class InterpolateHtmlPlugin {
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20 | constructor(htmlWebpackPlugin, replacements) {
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21 | this.htmlWebpackPlugin = htmlWebpackPlugin;
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22 | this.replacements = replacements;
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23 | }
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24 |
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25 | apply(compiler) {
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26 | compiler.hooks.compilation.tap('InterpolateHtmlPlugin', compilation => {
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27 | this.htmlWebpackPlugin
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28 | .getHooks(compilation)
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29 | .afterTemplateExecution.tap('InterpolateHtmlPlugin', data => {
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30 | // Run HTML through a series of user-specified string replacements.
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31 | Object.keys(this.replacements).forEach(key => {
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32 | const value = this.replacements[key];
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33 | data.html = data.html.replace(
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34 | new RegExp('%' + escapeStringRegexp(key) + '%', 'g'),
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35 | value
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36 | );
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37 | });
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38 | });
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39 | });
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40 | }
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41 | }
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42 |
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43 | module.exports = InterpolateHtmlPlugin;
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