qiankun（乾坤）

In Chinese traditional culture qian means heaven and kun stands for earth, so qiankun is the universe.

An implementation of Micro Frontends, based on single-spa, but made it production-ready.

Motivation

As we know what micro-frontends aims for:

Techniques, strategies and recipes for building a modern web app with **multiple teams **using different JavaScript frameworks. — Micro Frontends

An independent development experience is very important for a large system, especially with an enterprise application. But if you've tried to implement a micro-frontends architecture in such a system, you'll usually hurt your brain with such problems:

How to compose your independet sub apps into your main system?
How to guarantee your sub apps to be isolated by each other?

So we built an library to help you solve these glitch problems you may met when building a micro-frontends system, and named it qiankun.

Maybe the most complete micro-frontends solution you ever met🧐.

Features

Usage

npm i qiankun -S

Examples

npm i
npm run install:examples
npm start

Visit http://localhost:7099

import { registerMicroApps, start } from 'qiankun';

function render({ appContent, loading }) {
  const container = document.getElementById('container');
  ReactDOM.render(<Framework loading={loading} content={appContent}/>, container);
}

function genActiveRule(routerPrefix) {
  return (location) => location.pathname.startsWith(routerPrefix);
}

registerMicroApps(
  [
    { name: 'react app', entry: '//localhost:7100', render, activeRule: genActiveRule('/react') },
    { name: 'vue app', entry: { scripts: [ '//localhost:7100/main.js' ] }, render, activeRule: genActiveRule('/vue') },
  ],
  {
    beforeLoad: [async app => {
      console.log('before load', app);
    }],
    beforeMount: [async app => {
      console.log('before mount', app);
    }],
    afterMount: [async app => {
      console.log('before mount', app);
    }],
    afterUnmount: [async app => {
      console.log('after unload', app);
    }],
  },
);

start({ prefetch: true, jsSandbox: true });

API

registerMicroApps

function registerMicroApps<T extends object = {}>(apps: Array<RegistrableApp<T>>, lifeCycles?: LifeCycles<T>): void;

type RegistrableApp = {
  name: string; // app name
  entry: string | { scripts?: string[]; styles?: string[]; html?: string };  // app entry
  render: (props?: { appContent: string, loading: boolean }) => any;
  activeRule: (location: Location) => boolean;
  props?: object; // props pass through to app
};

type Lifecycle<T extends object> = (app: RegistrableApp<T>) => Promise<any>;
type LifeCycles<T extends object> = {
    beforeLoad?: Lifecycle<T> | Array<Lifecycle<T>>;
    beforeMount?: Lifecycle<T> | Array<Lifecycle<T>>;
    afterMount?: Lifecycle<T> | Array<Lifecycle<T>>;
    afterUnmount?: Lifecycle<T> | Array<Lifecycle<T>>;
};

start

function start({ prefetch: boolean, jsSandbox: boolean }): void;

Integration

Main Framework

Use qiankun api to register the micro apps like what example shows above.

Sub App

Export those lifecycle hooks from your entry

export async function bootstrap() {
  console.log('react app bootstraped');
}

export async function mount(props) {
  ReactDOM.render(<App/>, document.getElementById('react15Root'));
}

export async function unmount() {
  ReactDOM.unmountComponentAtNode(document.getElementById('react15Root'));
}

For more lifecycle information, see single-spa lifecycles

Config your bundler

While you wanna build a sub app to integrate with qiankun, pls make sure your bundler have the required configuration below:

webpack:

output: {
  library: packageName,
  libraryTarget: 'umd',
  jsonpFunction: `webpackJsonp_${packageName}`,
}

see https://webpack.js.org/configuration/output/#outputlibrary

parcel:

parcel serve entry.js --global myvariable

see https://en.parceljs.org/cli.html#expose-modules-as-umd

Community

https://github.com/umijs/umi#community

Acknowledgement

single-spa What an awesome meta-framework for micro-fronteds!

David-GXK/qiankun