Live Reload for Rollup Plugin

Supports web page reloading and Chrome extension reloading.

Install

npm i rollup-plugin-browser-sync-extension -D

Usage

rollup.config.js

import browserSync from 'rollup-plugin-browser-sync-extension';

export default {
  ...
  plugins: [
    browserSync({
      options: {
        open: false,
        server: 'build',
        single: true,
        ui: false,
        ghostMode: false,
        notify: false,
      },
    }),
  ],
};

Browsersync options

single: true is very suitable for single-page applications, resolving the error of not finding the page on refresh.

Browsersync sometimes interrupts reloading due to script injection failures. It's recommended to manually add the script in the HTML file for more reliability.

browserSync({
    options: {
        ...
        snippet: false,
    },
}),

<script async src="/browser-sync/browser-sync-client.js?v=2.29.3"></script>

Learn more about Browsersync configuration. https://browsersync.io/docs/options

Chrome Extension Reload

browserSync({
  options: {
    open: false,
    server: 'build',
    single: true,
    ui: false,
    ghostMode: false,
    notify: false,
  },
  extReload: true,
  extReloadOptions: { port: 5000 },
}),

• When extReload is set to false, use browserSync for webpage reloading with the configuration items as options.
• When extReload is set to true, use ws for extension reloading with the configuration items as extReloadOptions.

WebSocketServer Options

https://github.com/websockets/ws/blob/master/doc/ws.md#new-websocketserveroptions-callback

Chrome Extension Code

extReload.js

const ws = new WebSocket('ws://localhost:5000');
// Connection succeeded
ws.addEventListener('open', event => {
    console.log('OPEN');
});
// Receive server messages
ws.addEventListener('message', event => {
    console.log(`Message: ${event.data}`);
    // Reload background
    chrome.runtime.reload();
});
ws.addEventListener('error', error => {
    console.error(`WebSocket error: ${error}`);
});
// Reload tab
chrome.runtime.onInstalled.addListener(() => {
    chrome.tabs.query({ active: true, currentWindow: true, url: 'http://127.0.0.1/*' }, tabs => {
        tabs.forEach(tab => chrome.tabs.reload(tab.id));
    });
});

Code injection limited to development environment.

output: {
  ...
  banner: chunk => {
    // In development environment, inject reload script into specified files.
    // "watch" can be any custom name.
    if (process.env.NODE_ENV === 'watch' && chunk.fileName === 'service_worker.js') {
      const conent = fs.readFileSync('src/extReload.ts', 'utf-8');
      console.log('inject ok');
      return conent;
    }
    return '';
  },
},

Add environment variables

"scripts": {
  "watch": "rollup -c -w --environment NODE_ENV:watch",
},

Service Workers get terminated after being idle for a while.

Open the Service Worker view to keep it active.

https://developer.chrome.com/docs/extensions/mv3/service_workers/