Inject-assets-webpack-plugin NPM

Inject Assets Webpack Plugin

This is a simple but powerful webpack plugin which allows you to inject any webpack-related data to any project files.

Installation

npm install --save-dev inject-assets-webpack-plugin

Basic usage

Imagine you have bundle with hashed js files and you would like to cache them with service worker. To activate new service worker on rebuild you can also inject webpack build hash into service worker.

public/serviceWorker.js example:

// {hash}

var myHostname = '{hostname}';
var filesToCache = ['{bundleFiles}'];
...

var config = require('you-app-config.json');
var InjectAssetsWebpackPlugin = require('inject-assets-webpack-plugin');

var webpackConfig = {
  entry: {
    app: ['./src/app.js'],
    vendor: [
      'react',
      'react-dom',
      'redux',
      'react-redux'
    ],
  },
  output: {
    path: path.join(__dirname, '/public/'),
    filename: 'js/[name].[chunkhash].js',
    publicPath: '/'
  },
  plugins: [
    new InjectAssetsWebpackPlugin({
      filename: 'public/serviceWorker.js'
    },[
      {
        pattern: '{hash}',
        type: 'hash'
      },
      {
        pattern: '{hostname}',
        type: 'value',
        value: config.hostname
      },
      {
        pattern: '{bundleFiles}',
        type: 'chunks',
        chunks: ['app', 'vendor'],
        files: ['.js', '.css'],
        excludeFiles: ['.map'],
        decorator: function(fileNames) {
          return fileNames.join('\', \'');
        } 
      }
    ]),
    ...
  ]
};

You can also inject js and css files into html. It is better to use another plugin like html-webpack-plugin, but if you prefer full control of a process you can use inject-assets-webpack-plugin

public/index.html example:

<head>
  %styles%
</head>
<body>
...

  %scripts%
</body>

  plugins: [
    new InjectAssetsWebpackPlugin({
      filename: 'public/index.html'
    },[
      {
        pattern: '%styles%',
        type: 'chunks',
        chunks: ['app'],
        files: ['.css'],
        excludeFiles: ['.map'],
        decorator: function(fileNames) {
          return fileNames.reduce(function(output, fileName) {
            return output + '<link href="' + fileName + '" rel="stylesheet">';
          }, '');
        }
      },
      {
        pattern: '%scripts%',
        type: 'chunks',
        chunks: ['app', 'vendor'],
        files: ['.js'],
        excludeFiles: ['.map'],
        decorator: function(fileNames) {
          return fileNames.reduce(function(output, fileName) {
            return output + '<script type="text/javascript" src="' + fileName + '"></script>';
          }, '');
        }
      }
    ]),
    ...
  ]

Plugin specification

new InjectAssetsWebpackPlugin(options, [replacements])

options object has the following properties:

Property	Type	Default	Description
`filename`	`string`	`index.html` in output webpack dir	Path to a file which content should be replaced. Can be related to project root or absolute.
`event`	`string`	`done`	Webpack plugin event hook name which handles replacement. Can be one of `done`, `compile`, `emit`.

each replacement object has the following properties:

Property	Type	Default	Description
`pattern`	`string` or `RegExp`	none	Search pattern. All found entries will be replaced by replacement.
`type`	`string`	`chunks`	Define the replacement type. Can be one of`hash` - found entries will be replaced by webpack build hash,`value` - found entries will be replaced by the following value,`chunks` - found entries will be replaced by matched asset chunks file names.
`value`	`string` or `number`	none	Used only for `value` type. Defines replacement value.
`chunks`	`array`	all chunks	Used only for `chunks` type. Defines a list of webpack chunks names processed by plugin. Use all chunks if not specified.
`excludeChunks`	`array`	none	Used only for `chunks` type. Defines a list of webpack chunks names excluded from processing by plugin.
`files`	`string` or `RegExp`	none	Used only for `chunks` type. Only files matched by that puttern will be used as replacement.
`excludeFiles`	`string` or `RegExp`	none	Used only for `chunks` type. All files matched by that puttern will be excluded from replacement.
`decorator`	`function(array)`	none	Used only for `chunks` type. Used to decorate replacement file names

Licence

MIT

webpack plugin assets inject hash inject-assets-webpack-plugin

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