This will extend the other plugin's prototype to your one and copy the callbacks that the other plugin appends to the compiler on a property named compilerCallbacks.

Install

$ npm install --save-dev extend-webpack-plugin

Usage

Ensure you have webpack installed, e.g. npm install -g webpack

Example extending static-site-generator-webpack-plugin

After installing our plugin and the plugin you want to extend (static-site-generator-webpack-plugin in the following example) you can start coding your extension

$ npm install --save-dev extend-webpack-plugin static-site-generator-webpack-plugin

my-custom-plugin.js

const StaticSiteGeneratorWebpackPlugin = require('static-site-generator-webpack-plugin');
const ExtendWebpackPlugin = require('extend-webpack-plugin');

function MyCustomStaticSiteGeneratorPlugin() {
  const compilerCallbacks = ExtendWebpackPlugin(this, arguments).compilerCallbacks;
  this.emitCallback = compilerCallbacks['emit'];
}

MyCustomStaticSiteGeneratorPlugin.inheritsFrom(StaticSiteGeneratorWebpackPlugin);

MyCustomStaticSiteGeneratorPlugin.prototype.apply = function(compiler) {
  var self = this;

  compiler.plugin('emit', function(compiler, done) {
    self.locals.greet = "Hello from custom"; // Extend param
    return self.emitCallback(compiler, done); // call static-site-generator-webpack-plugin's emit callback
  });
};

module.exports = MyCustomStaticSiteGeneratorPlugin;

webpack.config.js

const MyCustomStaticSiteGeneratorPlugin = require('./my-custom-plugin');

const paths = [
  '/hello/',
  '/world/'
];

const locals = {};

module.exports = {

  entry: {
    'main': './index.js'
  },

  output: {
    filename: 'index.js',
    path: 'build',
    libraryTarget: 'umd'
  },

  plugins: [
    new MyCustomStaticSiteGeneratorPlugin('main', paths, locals)
  ]

};

index.js

// Client render (optional):
if (typeof document !== 'undefined') {
  console.log('Client render code goes here...');
}

// Exported static site renderer:
module.exports = function render(locals, callback) {
  callback(null, '<html>' + locals.greet + ' on ' + locals.path + '</html>');
};

API

As you can see in the previous example (full code here), you can extend a plugin by:

Calling ExtendWebpackPlugin on constructor:

ExtendWebpackPlugin(plugin, args)
- plugin: your plugin's instance that you want to extend functionality from another one
- args: an array of arguments to the parent plugin (you will probably just pass javascript especial arguments variable)
- this function returns the plugin instance with a property named compilerCallbacks:
  - for each function that the original plugin appends to webpack's compiler.plugin(name, callback), compilerCallbacks will have a property: compilerCallbacks[name] = callback

  function MyCustomStaticSiteGeneratorPlugin() {
    const compilerCallbacks = ExtendWebpackPlugin(this, arguments).compilerCallbacks;
    this.emitCallback = compilerCallbacks['emit'];
  }

Then you will call inheritsFrom function of your plugin to the other.

This is a special function that ExtendWebpackPlugin create on Function.prototype, that extend the other plugin's prototype and create a property named parent on your plugin:

  MyCustomStaticSiteGeneratorPlugin.inheritsFrom(StaticSiteGeneratorWebpackPlugin);

Finally create your own apply function and create custom steps before or after calling the original plugin's callback

MyCustomStaticSiteGeneratorPlugin.prototype.apply = function(compiler) {
  var self = this;

  compiler.plugin('emit', function(compiler, done) {
    self.locals.greet = "Hello from custom"; // Extend param
    return self.emitCallback(compiler, done); // call static-site-generator-webpack-plugin's emit callback
  });
};

License

MIT License

FAQs

What is extend-webpack-plugin?

Is extend-webpack-plugin well maintained?

Package last updated on 08 Aug 2016

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Install

extend-webpack-plugin