Example of using importScriptsViaChunks

custom-wb-code.js

import {registerRoute} from 'workbox-routing/registerRoute';

registerRoute('/path', yourHandlerCode);

webpack.config.js

const path = require('path');
const {GenerateSW} = require('workbox-webpack-plugin');

const config = {
  mode: 'production',
  entry: {
    main: path.resolve(__dirname, 'src', 'main.js'),
    customWBCode: path.resolve(__dirname, 'src', 'custom-wb-code.js'),
  },
  output: {
    path: path.resolve(__dirname, 'build'),
    filename: '[name].js',
  },
  plugins: [
    new GenerateSW({
      importScriptsViaChunks: ['customWBCode'],
      swDest: 'sw.js',
    }),
  ],
};

module.exports = config;