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vite-plugin-federation

A Vite/Rollup plugin which support Module Federation. Inspired by Webpack and compatible with Webpack Module Federation.

Running results

Install

npm install @originjs/vite-plugin-federation --save-dev

or

yarn add @originjs/vite-plugin-federation --dev

Usage

Using the Module Federation usually requires more than 2 projects, one as the host side and one as the remote side.

Step 1: Configure the remote side.

• for a vite project, modify vite.config.js:

// vite.config.js
import federation from "@originjs/vite-plugin-federation";
export default {
    plugins: [
        federation({
            name: 'remote-app',
            filename: 'remoteEntry.js',
            // Modules to expose
            exposes: {
                './Button': './src/Button.vue',
            },
            shared: ['vue']
        })
    ]
}

• for a rollup project, modify rollup.config.js:

// rollup.config.js
import federation from '@originjs/vite-plugin-federation'
export default {
    input: 'src/index.js',
    plugins: [
        federation({
            name: 'remote-app',
            filename: 'remoteEntry.js',
            // Modules to expose
            exposes: {
                './Button': './src/button'.
            },
            shared: ['vue']
        })
    ]
}

Step 2: Configure the host side

• for a vite project, modify vite.config.js:

// vite.config.js
import federation from "@originjs/vite-plugin-federation";
export default {
    plugins: [
        federation({
            name: 'host-app',
            remotes: {
                remote_app: "http://localhost:5001/assets/remoteEntry.js",
            },
            shared: ['vue']
        })
    ]
}

• for a rollup project, modify rollup.config.js:

// rollup.config.js
import federation from '@originjs/vite-plugin-federation'
export default {
    input: 'src/index.js',
    plugins: [
        federation({
            name: 'host-app',
            remotes: {
                remote_app: "http://localhost:5001/remoteEntry.js",
            },
            shared: ['vue']
        })
    ]
}

Step 3: Using remote modules on the host side

Using a Vue project as an example

import { createApp, defineAsyncComponent } from "vue";
const app = createApp(Layout);
...
const RemoteButton = defineAsyncComponent(() => import("remote_app/Button"));
app.component("RemoteButton", RemoteButton);
app.mount("#root");

Using remote components in templates

<template>
    <div>
        <RemoteButton />
    </div>
</template>

Example projects

Examples	Host	Remote
basic-host-remote	rollup+esm	rollup+esm
react-in-vue	vite+esm	vite+esm
simple-react-esm	rollup+esm	rollup+esm
simple-react-systemjs	rollup+systemjs	rollup+systemjs
simple-react-webpack	rollup+systemjs	webpack+systemjs
vue2-demo	vite+esm	vite+esm
vue3-advanced-demo	vite+esm  vue-router/pinia	vite+esm vue-router/pinia
vue3-demo-esm	vite+esm	vite+esm
vue3-demo-systemjs	vite+systemjs	vite+systemjs
vue3-demo-webpack-esm-esm	vite/webpack+esm	vite/webpack+esm
vue3-demo-webpack-esm-var	vite+esm	webpack+var
vue3-demo-webpack-systemjs	vite+systemjs	webpack+systemjs
react-vite	vite+react	vite + react

Features

Integration with Webpack

It is now possible to use Module Federation without the restrictions of Vite and Webpack! That is, you can choose to use the components exposed by vite-plugin-federation in Webpack or the components exposed by Webpack ModuleFederationPlugin in Vite. But you need to pay attention to the configuration in remotes, for different frameworks you need to specify remotes.from and remotes.format to make them work better. A couple of example projects can be found here.

• vue3-demo-webpack-esm-esm

• vue3-demo-webpack-esm-var

• vue3-demo-webpack-systemjs

⚠️ Note:

1. Vite is relatively easy to use with the Webpack component, but Webpack is best used with the vite-plugin-federation component using the esm format, as the other formats lack complete test cases for now.

2. It is not recommended to mix Vite and Webpack in React projects, as there is no guarantee that Vite/Rollup and Webpack will generate the same chunk when packaging commonjs, which may cause problems with shared.

Vite Dev mode

As Vite is built on esbuild in dev development mode, we provide separate support for dev mode to take advantage of Vite's high performance development server in the case of remote module deployment.

⚠️ Note:

• Only the Host side supports dev mode, the Remote side requires the RemoteEntry.js package to be generated using vite build. This is because Vite Dev mode is Bundleless and you can use vite build --watch to achieve a hot update effect.

Static import

Static import and dynamic import of components are supported, the following shows the difference between the two methods, you can see examples of dynamic import and static import in the project in examples, here is a simple example.

• Vue

// dynamic import
const myButton = defineAsyncComponent(() => import('remote/myButton'));
app.component('my-button' , myButton);
// or
export default {
  name: 'App',
  components: {
    myButton: () => import('remote/myButton'),
  }
}

// static import
import myButton from 'remote/myButton';
app.component('my-button' , myButton);
// or
export default {
  name: 'App',
  components: {
    myButton: myButton
  }
}

• React

// dynamic import
const myButton = React.lazy(() => import('remote/myButton'))

// static import
import myButton from 'remote/myButton'

⚠️ Note:

• Static imports may rely on the browser Top-level await feature, so you will need to set build.target in the configuration file to next or use the plugin vite-plugin-top-level-await. You can see the browser compatibility of top-level await here compatibility)

Configuration

name: string

Required as the module name of the remote module.

filename:string

As the entry file of the remote module, not required, default is remoteEntry.js

exposes

• As the remote module, the list of components exposed to the public, required for the remote module.

exposes: {
// 'externally exposed component name': 'externally exposed component address'
    './remote-simple-button': './src/components/Button.vue',
        './remote-simple-section': './src/components/Section.vue'
},

---

remotes

The remote module entry file referenced as a local module

external:string|Promise<string>

• remote module address, e.g. https://localhost:5011/remoteEntry.js
• You can simply configure it as follows

  remotes: {
    // 'remote module name': 'remote module entry file address'
    'remote-simple': 'http://localhost:5011/remoteEntry.js',
}

• Or do a slightly more complex configuration, if you need to use other fields

remotes: {
    remote-simple: {
        external: 'http://localhost:5011/remoteEntry.js',
        format: 'var',
    }
}

externalType: 'url'|'promise'

• default: 'url'
• Set the type of external. If you want to use a dynamic url address, you can set the external as promise, but please note that you need to set the externalType as 'promise' at the same time, and please ensure that the code of the promise part is correct, otherwise the package may fail,here is a simple example.

remotes: {
      home: {
          external: `Promise.resolve('your url')`,
          externalType: 'promise'
      },
},
    
// or from networke
remotes: {
    remote-simple: {
        external: `fetch('your url').then(response=>response.json()).then(data=>data.url)`,
        externalType: 'promise'
    }
}

format:'esm'|'systemjs'|'var'

• default:'esm'
• Specify the format of the remote component, this is more effective when the host and the remote use different packaging formats, for example the host uses vite + esm and the remote uses webpack + var, in which case you need to specify type : 'var'

from : 'vite'|'webpack'

• default : 'vite'
• Specify the source of the remote component, from vite-plugin-federation select vite, from webpack select webpack

---

shared

Dependencies shared by local and remote modules. Local modules need to configure the dependencies of all used remote modules; remote modules need to configure the dependencies of externally provided components.

import: boolean

• default: true
• The default is true, whether to add shared to the module, only for the remote side, remote will reduce some of the packaging time when this configuration is turned on, because there is no need to package some of the shared, but once there is no shared module available on the host side, it will report an error directly, because there is no fallback module available

shareScope: string

• default: 'default'
• Default is defualt, the shared domain name, just keep the remote and host sides the same

version: string

Only works on host side, the version of the shared module provided is version of the package.json file in the shared package by default, you need to configure it manually only if you can't get version by this method

requiredVersion: string

Only for the remote side, it specifies the required version of the host shared used, when the version of the host side does not meet the requiredVersion requirement, it will use its own shared module, provided that it is not configured with import=false, which is not enabled by default

packagePath: string

• supportMode: only serve
• Allow custom packages to be shared via packagePath (previously limited to those under node_modules), For Example You can only define similar shared

shared :{
    packageName:{
        ...
    }
}

• packageName must be a package under node_modules, such as vue, react, etc., but you cannot define your own package. But now you can share a custom package by specifying the package path, for example

shared: {
    packageName: {
        packagePath: './src/a/index.js'
    }
}

generate : boolean

• default: true
• generate a shared chunk file or not , if you make sure that the host side has a share that can be used, then you can set not to generate a shared file on the remote side to reduce the size of the remote's chunk file, which is only effective on the remote side, the host side will generate a shared chunk no matter what.

shared: {
    packageName: {
        generate: false
    }
}

FAQ

ERROR: Top-level await is not available in the configured target environment

The solution is to set build.target to esnext, which you can find at https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/await to see the support for this feature in each browser.

build: {
    target: "esnext"
  }

or

 build: {
    target: ["chrome89", "edge89", "firefox89", "safari15"]
 }

Or you can try using the plugin vite-plugin-top-level-await to eliminate top-level-await, as demonstrated in vue3-demo- esm demonstrates this usage

Is not generating chunk properly?

Please check if you have started the project in dev mode with vite, currently only the fully pure host side can use dev mode, the remote side must use build mode to make the plugin take effect.

React uses federation for some questions

It is recommended to check this Issue, which contains most of the React related issues

The remote module failed to load the share of the local module, for examplelocalhost/:1 Uncaught (in promise) TypeError: Failed to fetch dynamically imported module: http://your url

Reason: Vite has auto fetch logic for IP and Port when starting the service, no full fetch logic has been found in the Plugin, and in some cases a fetch failure may occur.

Solutions：

Explicitly declaring IP, Port, cacheDir in the local module ensures that our Plugin can correctly fetch and pass the dependent addresses.

Local module's vite.config.ts

export default defineConfig({
  server:{
    https: "http",
    host: "192.168.56.1",
    port: 5100,
  },
  cacheDir: "node_modules/.cacheDir",
}

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