HTML Webpack Plugin

This is a webpack plugin that simplifies creation of HTML files to serve your webpack bundles. This is especially useful for webpack bundles that include a hash in the filename which changes every compilation. You can either let the plugin generate an HTML file for you, supply your own template using lodash templates or use your own loader.

Installation

Install the plugin with npm:

$ npm install html-webpack-plugin@2 --save-dev

Migration guide from 1.x

If you used the 1.x version please take a look at the migration guide In case I missed something please open a pull request for it. See also issue #186

Basic Usage

The plugin will generate an HTML5 file for you that includes all your webpack bundles in the body using script tags. Just add the plugin to your webpack config as follows:

var HtmlWebpackPlugin = require('html-webpack-plugin')
var webpackConfig = {
  entry: 'index.js',
  output: {
    path: 'dist',
    filename: 'index_bundle.js'
  },
  plugins: [new HtmlWebpackPlugin()]
}

This will generate a file dist/index.html containing the following:

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title>Webpack App</title>
  </head>
  <body>
    <script src="index_bundle.js"></script>
  </body>
</html>

If you have multiple webpack entry points, they will all be included with script tags in the generated HTML.

If you have any css assets in webpack's output (for example, css extracted with the ExtractTextPlugin) then these will be included with <link> tags in the HTML head.

Configuration

You can pass a hash of configuration options to HtmlWebpackPlugin. Allowed values are as follows:

title: The title to use for the generated HTML document.
filename: The file to write the HTML to. Defaults to index.html. You can specify a subdirectory here too (eg: assets/admin.html).
template: Path to the template. Supports loaders e.g. html!./index.html.
inject: true | 'head' | 'body' | false Inject all assets into the given template or templateContent - When passing true or 'body' all javascript resources will be placed at the bottom of the body element. 'head' will place the scripts in the head element.
favicon: Adds the given favicon path to the output html.
minify: {...} | false Pass a html-minifier options object to minify the output.
hash: true | false if true then append a unique webpack compilation hash to all included scripts and css files. This is useful for cache busting.
cache: true | false if true (default) try to emit the file only if it was changed.
showErrors: true | false if true (default) errors details will be written into the html page.
chunks: Allows you to add only some chunks (e.g. only the unit-test chunk)
chunksSortMode: Allows to control how chunks should be sorted before they are included to the html. Allowed values: 'none' | 'auto' | 'dependency' | {function} - default: 'auto'
excludeChunks: Allows you to skip some chunks (e.g. don't add the unit-test chunk)

Here's an example webpack config illustrating how to use these options:

{
  entry: 'index.js',
  output: {
    path: 'dist',
    filename: 'index_bundle.js',
    hash: true
  },
  plugins: [
    new HtmlWebpackPlugin({
      title: 'My App',
      filename: 'assets/admin.html'
    })
  ]
}

Generating Multiple HTML Files

To generate more than one HTML file, declare the plugin more than once in your plugins array:

{
  entry: 'index.js',
  output: {
    path: 'dist',
    filename: 'index_bundle.js'
  },
  plugins: [
    new HtmlWebpackPlugin(), // Generates default index.html
    new HtmlWebpackPlugin({  // Also generate a test.html
      filename: 'test.html',
      template: 'src/assets/test.html'
    })
  ]
}

Writing Your Own Templates

If the default generated HTML doesn't meet your needs you can supply your own template. The easiest way is to use the inject option and pass a custom html file. The html-webpack-plugin will automatically inject all necessary css, js, manifest and favicon files into the markup.

plugins: [
  new HtmlWebpackPlugin({
    title: 'Custom template',
    template: 'my-index.ejs', // Load a custom template
    inject: 'body' // Inject all scripts into the body
  })
]

my-index.ejs:

<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-type" content="text/html; charset=utf-8"/>
    <title><%= htmlWebpackPlugin.options.title %></title>
  </head>
  <body>
  </body>
</html>

If you already have a template loader, you can use it to parse the template. Please note that this will also happen if you specifiy the html-loader and use .html file as template.

module: {
  loaders: [
    { test: /\.hbs$/, loader: "handlebars" }
  ]
},
plugins: [
  new HtmlWebpackPlugin({
    title: 'Custom template using Handlebars',
    template: 'my-index.hbs'
  })
]

You can use the lodash syntax out of the box. If the inject feature doesn't fit your needs and you want full control over the asset placement use the default template of the html-webpack-template project as a starting point for writing your own.

The following variables are available in the template:

htmlWebpackPlugin: data specific to this plugin
- htmlWebpackPlugin.files: a massaged representation of the assetsByChunkName attribute of webpack's stats object. It contains a mapping from entry point name to the bundle filename, eg:
```
"htmlWebpackPlugin": {
  "files": {
    "css": [ "main.css" ],
    "js": [ "assets/head_bundle.js", "assets/main_bundle.js"],
    "chunks": {
      "head": {
        "entry": "assets/head_bundle.js",
        "css": [ "main.css" ]
      },
      "main": {
        "entry": "assets/main_bundle.js",
        "css": []
      },
    }
  }
}
```
  If you've set a publicPath in your webpack config this will be reflected correctly in this assets hash.
- htmlWebpackPlugin.options: the options hash that was passed to the plugin. In addition to the options actually used by this plugin, you can use this hash to pass arbitrary data through to your template.
webpack: the webpack stats object. Note that this is the stats object as it was at the time the HTML template was emitted and as such may not have the full set of stats that are available after the wepback run is complete.
webpackConfig: the webpack configuration that was used for this compilation. This can be used, for example, to get the publicPath (webpackConfig.output.publicPath).

Filtering chunks

To include only certain chunks you can limit the chunks being used:

plugins: [
  new HtmlWebpackPlugin({
    chunks: ['app']
  })
]

It is also possible to exclude certain chunks by setting the excludeChunks option:

plugins: [
  new HtmlWebpackPlugin({
    excludeChunks: ['dev-helper']
  })
]

Events

To allow other plugins to alter the html this plugin executes the following events:

html-webpack-plugin-before-html-processing
html-webpack-plugin-after-html-processing
html-webpack-plugin-after-emit

Usage:

compilation.plugin('html-webpack-plugin-before-html-processing', function(htmlPluginData, callback) {
  htmlPluginData.html += 'The magic footer';
  callback();
});

License

pirelenito/html-webpack-plugin

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