@module-federation/node

Module Federation Support for Node Environments

This package exposes three Webpack Plugins to bring the concept and power of Module Federation to NodeJS. This will allow your server to fetch chunks across the network allowing for distributed deployments of federated applications.

Installation

To install the plugin run one of the following commands in your terminal for your application.

# npm
npm install @module-federation/node

# yarn
yarn add @module-federation/node

Usage

There are two approaches to using the plugins exported from this package, dependent on your use case.

UniversalFederationPlugin

This plugin is an abstraction over both StreamingTargetPlugin and ModuleFederationPlugin. It will alternate between which it uses based on where the build is intended to be used.

If the build is intended to be used on the browser, it will use the standard ModuleFederationPlugin and bundle your code accordingly, however, if it is intended for server usage, it will use StreamingTargetPlugin to create the bundle.

This simplifies the code required in your webpack.config.js to enable SSR Module Federation. It determines which platform it needs to build for based on two things:

1. If the options passed to the plugin has specified isServer: true
2. If the name assigned to the config being used is server

It accepts the other standard options from ModuleFederationPlugin as well. You can see an example usage below:

const {UniversalFederationPlugin} = require("@module-federation/node");

const config = {
  target: isServer ? false : "web",
  plugins: [
    new UniversalFederationPlugin({
      name: 'website2',
      library: {type: 'commonjs-module'}, 
      isServer: true, // or false
      remotes: {},
      filename: 'remoteEntry.js',
      exposes: {
        './SharedComponent': './remoteServer/SharedComponent',
      },
    }),
  ]
}

StreamingTargetPlugin and NodeFederationPlugin

You can also use each of the underlying plugins individually if you need more control over when they are used.

At build time, you need to be aware if you're building for the server or for the browser. If it's building for server, we need to set target: false to allow the plugins to function correctly.

The StreamingTargetPlugin follows the same API as the Module Federation Plugin and therefore should be a drop-in replacement if you already have it set up in your webpack.config.js.

An example configuration is presented below:

const {StreamingTargetPlugin, NodeFederationPlugin} = require("@module-federation/node");

const config = {
  target: isServer ? false : "web",
  plugins: [
    new StreamingTargetPlugin({
      name: 'website2',
      library: {type: 'commonjs-module'},
      remotes: {},
      filename: 'remoteEntry.js',
      exposes: {
        './SharedComponent': './remoteServer/SharedComponent',
      },
    }),
    new NodeFederationPlugin({
      name: 'website2',
      library: {type: 'commonjs-module'},
      remotes: {},
    }),
  ]
}