Include Assets extension for the HTML Webpack Plugin

Enhances html-webpack-plugin functionality by allowing you to specify js or css assets to be included.

When using a plugin such as copy-webpack-plugin you may have assets output to your build directory that are not detected/output by the html-webpack-plugin.

This plugin allows you to force some of these assets to be included in the output from html-webpack-plugin.

Installation

You must be running webpack on node 4.x or higher

Install the plugin with npm:

$ npm install --save-dev html-webpack-include-assets-plugin

Basic Usage

Require the plugin in your webpack config:

var HtmlWebpackIncludeAssetsPlugin = require('html-webpack-include-assets-plugin');

Add the plugin to your webpack config as follows:

plugins: [
  new HtmlWebpackPlugin(),
  new HtmlWebpackIncludeAssetsPlugin({ assets: [], append: true })
]

Note that some users have encountered issues with plugin ordering.

It is advisable to always place any HtmlWebpackPlugin plugins before any HtmlWebpackIncludeAssetsPlugin plugins in your webpack config.

Options

The available options are:

• jsExtensions: string or array

  Specifies the file extensions to use to determine if assets are script assets. Default is ['.js'].

• cssExtensions: string or array

  Specifies the file extensions to use to determine if assets are style assets. Default is ['.css'].

• assets: string or array or object

  Assets that will be output into your html-webpack-plugin template.

  To specify just one asset, simply pass a string or object. To specify multiple, pass an array of strings or objects.

  If the asset path is static and ends in one of the jsExtensions or cssExtensions values, simply use a string value.

  If the asset is not static or does not have a valid extension, you can instead pass an object with properties path (required) and type or glob or globPath or attributes (optional). In this case path is the asset href/src, type is one of js or css, and glob is a wildcard to use to match all files in the path (uses the glob package). The globPath can be used to specify the directory from which the glob should search for filename matches (the default is to use path within webpack's output directory).

  The attributes property may be used to add additional attributes to the link or script element that is injected. The keys of this object are attribute names and the values are the attribute values (string or boolean key values are allowed).

  The assetPath property may be used to specify the full path to the included asset. This can be useful as it will trigger a recompilation after the assets have changed when using webpack-dev-server or webpack-dev-middleware in development mode.

• append: boolean

  Specifying whether the assets should be prepended (false) before any existing assets, or appended (true) after them.

• resolvePaths: boolean

  Specifying whether the asset paths should be resolved with path.resolve (i.e. made absolute).

• publicPath: boolean or string

  Specifying whether the assets should be prepended with webpack's public path or a custom publicPath (string).

  A value of false may be used to disable prefixing with webpack's publicPath, or a value like myPublicPath/ may be used to prefix all assets with the given string. Default is true.

• hash: boolean or function(assetName, hash)

  Specifying whether the assets should be appended with webpack's compilation hash. This is useful for cache busting. Default is false.

• files: string or array

  Files that the assets will be added to.

  By default the assets will be included in all files. If files are defined, the assets will only be included in specified file globs (uses the minimatch package).

  • cssAssets: array

  Optional shortcut for adding css assets. An array of css asset objects.

  See the cssAssets example below for the syntax of css asset object.

Example

Using HtmlWebpackIncludeAssetsPlugin and CopyWebpackPlugin to include assets to html-webpack-plugin template :

plugins: [
  new CopyWebpackPlugin([
    { from: 'node_modules/bootstrap/dist/css', to: 'css/'},
    { from: 'node_modules/bootstrap/dist/fonts', to: 'fonts/'}
  ]),
  new HtmlWebpackPlugin(),
  new HtmlWebpackIncludeAssetsPlugin({
    assets: ['css/bootstrap.min.css', 'css/bootstrap-theme.min.css'],
    append: false
  })
]

Appending and prepending at the same time :

plugins: [
  new CopyWebpackPlugin([
    { from: 'node_modules/bootstrap/dist/css', to: 'css/'},
    { from: 'node_modules/bootstrap/dist/fonts', to: 'fonts/'}
  ]),
  new HtmlWebpackPlugin(),
  new HtmlWebpackIncludeAssetsPlugin({
    assets: ['css/bootstrap.min.css', 'css/bootstrap-theme.min.css'],
    append: false
  }),
  new HtmlWebpackIncludeAssetsPlugin({
    assets: ['css/custom.css'],
    append: true
  })
]

Using custom jsExtensions :

plugins: [
  new HtmlWebpackPlugin(),
  new HtmlWebpackIncludeAssetsPlugin({
    assets: ['dist/output.js', 'lib/content.jsx'],
    append: false,
    jsExtensions: ['.js', '.jsx']
  })
]

Using custom publicPath :

plugins: [
  new CopyWebpackPlugin([
    { from: 'node_modules/bootstrap/dist/css', to: 'css/'},
    { from: 'node_modules/bootstrap/dist/fonts', to: 'fonts/'}
  ]),
  new HtmlWebpackPlugin(),
  new HtmlWebpackIncludeAssetsPlugin({
    assets: ['css/bootstrap.min.css', 'css/bootstrap-theme.min.css'],
    append: false,
    publicPath: 'myPublicPath/'
  })
]

Or to include assets without prepending the publicPath:

plugins: [
  new HtmlWebpackPlugin(),
  new HtmlWebpackIncludeAssetsPlugin({
    assets: ['css/no-public-path.min.css', 'http://some.domain.com.js'],
    append: false,
    publicPath: false
  })
]

Manually specifying asset types :

plugins: [
  new CopyWebpackPlugin([
    { from: 'node_modules/bootstrap/dist/css', to: 'css/'},
    { from: 'node_modules/bootstrap/dist/fonts', to: 'fonts/'}
  ]),
  new HtmlWebpackPlugin(),
  new HtmlWebpackIncludeAssetsPlugin({
    assets: [
      '/css/bootstrap.min.css',
      '/css/bootstrap-theme.min.css',
      { path: 'https://fonts.googleapis.com/css?family=Material+Icons', type: 'css' }
    ],
    append: false,
    publicPath: ''
  })
]

Adding custom attributes to asset tags :

The bootstrap-theme link tag will be given an id="bootstrapTheme" attribute.

plugins: [
  new CopyWebpackPlugin([
    { from: 'node_modules/bootstrap/dist/css', to: 'css/'},
    { from: 'node_modules/bootstrap/dist/fonts', to: 'fonts/'}
  ]),
  new HtmlWebpackPlugin(),
  new HtmlWebpackIncludeAssetsPlugin({
    assets: [
      '/css/bootstrap.min.css',
      { path: '/css/bootstrap-theme.min.css', attributes: { id: 'bootstrapTheme' } }
    ],
    append: false,
    publicPath: ''
  })
]

Using hash option :

When the hash option is set to true, asset paths will be appended with a hash query parameter (?hash=<the_hash>)

plugins: [
  new CopyWebpackPlugin([
    { from: 'node_modules/bootstrap/dist/css', to: 'css/'},
    { from: 'node_modules/bootstrap/dist/fonts', to: 'fonts/'}
  ]),
  new HtmlWebpackPlugin(),
  new HtmlWebpackIncludeAssetsPlugin({
    assets: ['css/bootstrap.min.css', 'css/bootstrap-theme.min.css'],
    append: false,
    hash: true
  })
]

When the hash option is set to a function, asset paths will be replaced with the result of executing that function

plugins: [
  new CopyWebpackPlugin([
    { from: 'somepath/somejsfile.js', to: 'js/somejsfile.[hash].js' },
    { from: 'somepath/somecssfile.css', to: 'css/somecssfile.[hash].css' }
  ]),
  new HtmlWebpackPlugin(),
  new HtmlWebpackIncludeAssetsPlugin({
    assets: [{ path: 'js', glob: '*.js', globPath: 'somepath' }],
    assets: [{ path: 'css', glob: '*.css', globPath: 'somepath' }],
    append: false,
    hash: function(assetName, hash) {
      assetName = assetName.replace(/\.js$/, '.' + hash + '.js');
      assetName = assetName.replace(/\.css$/, '.' + hash + '.css');
      return assetName;
    }
  })
]

Specifying specific files

plugins: [
  new CopyWebpackPlugin([
    { from: 'node_modules/bootstrap/dist/css', to: 'css/'},
    { from: 'node_modules/bootstrap/dist/fonts', to: 'fonts/'}
  ]),
  new HtmlWebpackPlugin({
    filename: 'a/index.html'
  }),
  new HtmlWebpackPlugin({
    filename: 'b/index.html'
  }),
  new HtmlWebpackIncludeAssetsPlugin({
    files: ['a/**/*.html'],
    assets: ['css/a.css'],
    append: true
  }),
  new HtmlWebpackIncludeAssetsPlugin({
    files: ['b/**/*.html'],
    assets: ['css/b.css'],
    append: true
  })
]

Specifying assets usings a glob

Note that since copy-webpack-plugin does not actually copy the files to webpack's output directory until after html-webpack-plugin has completed, it is necessary to use the globPath to retrieve filename matches relative to the original location of any such files.

plugins: [
  new CopyWebpackPlugin([
    { from: 'node_modules/bootstrap/dist/css', to: 'css/'},
    { from: 'node_modules/bootstrap/dist/fonts', to: 'fonts/'}
  ]),
  new HtmlWebpackPlugin(),
  new HtmlWebpackIncludeAssetsPlugin({
    assets: [{ path: 'css', glob: '*.css', globPath: 'node_modules/bootstrap/dist/css/' }],
    append: true
  })
]

Specifying cssAssets (a shortcut for specifying assets of type css)

output: {
  publicPath: '/my-public-path/'
},
plugins: [
  new CopyWebpackPlugin([
    { from: 'node_modules/bootstrap/dist/css', to: 'css/'},
    { from: 'node_modules/bootstrap/dist/fonts', to: 'fonts/'}
  ]),
  new HtmlWebpackPlugin(),
  new HtmlWebpackIncludeAssetsPlugin({
    assets: [],
    append: true,
    cssAssets: [
      {
        href: 'asset/path',
        attributes: {
          rel: 'icon'
        }
      },
      {
        href: '/absolute/asset/path',
        asset: false,
        attributes: {
          rel: 'manifest'
        }
      }
    ]
  })
]

Will append the following link elements into the index template html

<head>
  <!-- previous header content -->
  <link rel="icon" href="/my-public-path/asset/path"/>
  <link rel="manifest" href="/absolute/asset/path"/>
</head>

Note that the second cssAsset's href was not prefixed with the webpack publicPath because csAsset.asset was set to false.