Vite plugin for Module Federation

Reason why 🤔

Microservices nowadays is a well-known concept and maybe you are using it in your current company. Do you know that now you can apply similar ideas on the Frontend? With Module Federation you can load separately compiled and deployed code into a unique application. This plugin makes Module Federation work together with Vite.

Working implementations

Vue

React

Svelte

SvelteKit

SolidJS

More examples here

Try this crazy example with all these bundlers together

pnpm install
pnpm run build
pnpm run multi-example

Getting started 🚀

https://module-federation.io/guide/basic/webpack.html

With @module-federation/vite, the process becomes delightfully simple, you will only find the differences from a normal Vite configuration.

This example is with Vue.js
The @module-federation/vite configuration remains the same for different frameworks.

The Remote Application configuration

file: remote/vite.config.ts

import { defineConfig } from 'vite';
import { federation } from '@module-federation/vite'; 👈

export default defineConfig({
  [...]
  plugins: [
    [...]
    federation({ 👈
      name: "remote",
      filename: "remoteEntry.js",
      exposes: {
        "./remote-app": "./src/App.vue",
      },
      shared: ["vue"],
    }),
  ],
  server: {
    origin: "http://localhost:{Your port}"
  },
  // Do you need to support build targets lower than chrome89?
  // You can use 'vite-plugin-top-level-await' plugin for that.
  build: {
    target: 'chrome89',
  },
  [...]
});

In this remote app configuration, we define a remoteEntry.js file that will expose the App component. The shared property ensures that both host and remote applications use the same vue library.

The Host Application configuration

file host/vite.config.ts

import { defineConfig } from 'vite';
import { federation } from '@module-federation/vite'; 👈

export default defineConfig({
  [...]
  plugins: [
    [...]
    federation({ 👈
      name: "host",
      remotes: {
        remote: {
          type: "module",
          name: "remote",
          entry: "https://[...]/remoteEntry.js",
          entryGlobalName: "remote",
          shareScope: "default",
        },
      },
      filename: "remoteEntry.js",
      shared: ["vue"],
    }),
  ],
  server: {
    origin: "http://localhost:{Your port}"
  },
  // Do you need to support build targets lower than chrome89?
  // You can use 'vite-plugin-top-level-await' plugin for that.
  build: {
    target: 'chrome89',
  },
  [...]
});

The host app configuration specifies its name, the filename of its exposed remote entry remoteEntry.js, and importantly, the configuration of the remote application to load.

Load the Remote App

In your host app, you can now import and use the remote app with defineAsyncComponent

file host/src/App.vue

<script setup lang="ts">
import { defineAsyncComponent } from "vue";
const RemoteMFE = defineAsyncComponent( 👈
  () => import("remote/remote-app")
);
</script>

<template>
  <RemoteMFE v-if="!!RemoteMFE" /> 👈
</template>

So far so good 🎉

Now you are ready to use Module Federation in Vite!