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HTML Webpack Plugin

Plugin that simplifies creation of HTML files to serve your bundles

Install

  npm i --save-dev html-webpack-plugin

  yarn add --dev 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.

`Plugins`

The html-webpack-plugin provides hooks to extend it to your needs. There are already some really powerful plugins which can be integrated with zero configuration

webpack-subresource-integrity for enhanced asset security
appcache-webpack-plugin for iOS and Android offline usage
favicons-webpack-plugin which generates favicons and icons for iOS, Android and desktop browsers
html-webpack-harddisk-plugin can be used to always write to disk the html file, useful when webpack-dev-server / HMR are being used
html-webpack-inline-source-plugin to inline your assets in the resulting HTML file
html-webpack-inline-svg-plugin to inline SVGs in the resulting HTML file.
html-webpack-exclude-assets-plugin for excluding assets using regular expressions
html-webpack-include-assets-plugin for including lists of js or css file paths (such as those copied by the copy-webpack-plugin).
script-ext-html-webpack-plugin to add async, defer or module attributes to your <script> elements, or even inline them
style-ext-html-webpack-plugin to convert your <link>s to external stylesheets into <style> elements containing internal CSS
resource-hints-webpack-plugin to add resource hints for faster initial page loads using <link rel='preload'> and <link rel='prefetch'>
preload-webpack-plugin for automatically wiring up asynchronous (and other types) of JavaScript chunks using <link rel='preload'> helping with lazy-loading
link-media-html-webpack-plugin allows for injected stylesheet <link /> tags to have their media attribute set automatically; useful for providing specific desktop/mobile/print etc. stylesheets that the browser will conditionally download
inline-chunk-manifest-html-webpack-plugin for inlining webpack's chunk manifest. Default extracts manifest and inlines in <head>
html-webpack-inline-style-plugin for inlining styles to HTML elements using juice. Useful for email generation automatisation.
html-webpack-exclude-empty-assets-plugin removes empty assets from being added to the html. This fixes some problems with extract-text-plugin with webpack 4.
webpack-concat-plugin for concat and uglify files that needn't to be webpack bundles(for legacy files) and inject to html-webpack-plugin.

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:

webpack.config.js

const HtmlWebpackPlugin = require('html-webpack-plugin')

module.exports = {
  entry: 'index.js',
  output: {
    path: __dirname + '/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.

If you have plugins that make use of it, html-webpack-plugin should be ordered first before any of the integrated plugins.

Options

You can pass a hash of configuration options to html-webpack-plugin. Allowed values are as follows

Name	Type	Default	Description
`title`	`{String}`	``	The title to use for the generated HTML document
`filename`	`{String}`	`'index.html'`	The file to write the HTML to. Defaults to `index.html`. You can specify a subdirectory here too (eg: `assets/admin.html`)
`template`	`{String}`	``	`webpack` require path to the template. Please see the docs for details
`templateParameters`	`{Boolean\\|Object\\|Function}`	``	Allows to overwrite the parameters used in the template
`inject`	`{Boolean\\|String}`	`true`	`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`	`{String}`	``	Adds the given favicon path to the output HTML
`meta`	`{Object}`	`{}`	Allows to inject `meta`-tags. E.g. `meta: {viewport: 'width=device-width, initial-scale=1, shrink-to-fit=no'}`
`minify`	`{Boolean\\|Object}`	`true`	Pass html-minifier's options as object to minify the output
`hash`	`{Boolean}`	`false`	If `true` then append a unique `webpack` compilation hash to all included scripts and CSS files. This is useful for cache busting
`cache`	`{Boolean}`	`true`	Emit the file only if it was changed
`showErrors`	`{Boolean}`	`true`	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`	`{String\\|Function}`	`auto`	Allows to control how chunks should be sorted before they are included to the HTML. Allowed values are `'none' \\| 'auto' \\| 'dependency' \\| 'manual' \\| {Function}`
`excludeChunks`	`{Array.<string>}`	``	Allows you to skip some chunks (e.g don't add the unit-test chunk)
`xhtml`	`{Boolean}`	`false`	If `true` render the `link` tags as self-closing (XHTML compliant)

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

webpack.config.js

{
  entry: 'index.js',
  output: {
    path: __dirname + '/dist',
    filename: 'index_bundle.js'
  },
  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

webpack.config.js

{
  entry: 'index.js',
  output: {
    path: __dirname + '/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 template 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',
    // Load a custom template (lodash by default see the FAQ for details)
    template: 'index.html'
  })
]

index.html

<!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.

webpack.config.js

module: {
  loaders: [
    { test: /\.hbs$/, loader: "handlebars" }
  ]
},
plugins: [
  new HtmlWebpackPlugin({
    title: 'Custom template using Handlebars',
    template: '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 webpack 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).
compilation: the webpack compilation object. This can be used, for example, to get the contents of processed assets and inline them directly in the page, through compilation.assets[...].source() (see the inline template example).

`Filtering Chunks`

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

webpack.config.js

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

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

webpack.config.js

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

`Events`

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

`Sync`

html-webpack-plugin-alter-chunks

`Async`

html-webpack-plugin-before-html-generation
html-webpack-plugin-before-html-processing
html-webpack-plugin-alter-asset-tags
html-webpack-plugin-after-html-processing
html-webpack-plugin-after-emit

Example implementation: html-webpack-harddisk-plugin

plugin.js

function MyPlugin(options) {
  // Configure your plugin with options...
}

MyPlugin.prototype.apply = function (compiler) {
  compiler.plugin('compilation', (compilation) => {
    console.log('The compiler is starting a new compilation...');

    compilation.plugin(
      'html-webpack-plugin-before-html-processing',
      (data, cb) => {
        data.html += 'The Magic Footer'

        cb(null, data)
      }
    )
  })
}

module.exports = MyPlugin

webpack.config.js

plugins: [
  new MyPlugin({ options: '' })
]

Note that the callback must be passed the HtmlWebpackPluginData in order to pass this onto any other plugins listening on the same html-webpack-plugin-before-html-processing event

Maintainers

Jan Nicklas Thomas Sileghem

Contributors

This project exists thanks to all the people who contribute.

You're free to contribute to this project by submitting issues and/or pull requests. This project is test-driven, so keep in mind that every change and new feature should be covered by tests.

This project uses the semistandard code style.

Backers

Thank you to all our backers! 🙏 Become a backer

README.md

HTML Webpack Plugin

Install

Plugins

Usage

Options

Generating Multiple HTML Files

Writing Your Own Templates

Filtering Chunks

Events

Sync

Async

Maintainers

Contributors

Backers

Sponsors

`Plugins`

`Generating Multiple HTML Files`

`Writing Your Own Templates`

`Filtering Chunks`

`Events`

`Sync`

`Async`