rollup.config.js

import svelte from 'rollup-plugin-svelte';
import resolve from '@rollup/plugin-node-resolve';
import commonjs from '@rollup/plugin-commonjs';
import replace from '@rollup/plugin-replace';
// import livereload from 'rollup-plugin-livereload';
import builtins from 'rollup-plugin-node-builtins';
import { terser } from 'rollup-plugin-terser';
const production = !process.env.ROLLUP_WATCH;
const onwarn = (warning, onwarn) => (warning.code === "PLUGIN_WARNING" && warning.message === "A11y: '#' is not a valid href attribute") || onwarn(warning);
function serve() {
	let server;
	function toExit() {
		if (server) server.kill(0);
	}
	return {
		writeBundle() {
			if (server) return;
			server = require('child_process').spawn('npm', ['run', 'start', '--', '--dev'], {
				stdio: ['ignore', 'inherit', 'inherit'],
				shell: true
			});
			process.on('SIGTERM', toExit);
			process.on('exit', toExit);
		}
	};
}
export default {	
	input: 'src/main.js',
	output: {
		sourcemap: true,
		format: 'iife',
		name: 'app',
		file: 'public/build/bundle.js'
	},
	plugins: [
		svelte({
			// enable run-time checks when not in production
			dev: !production,
			// we'll extract any component CSS out into
			// a separate file - better for performance
			css: css => {
				css.write('public/build/bundle.css');
			}
		}),

		// If you have external dependencies installed from
		// npm, you'll most likely need these plugins. In
		// some cases you'll need additional configuration -
		// consult the documentation for details:
		// https://github.com/rollup/plugins/tree/master/packages/commonjs
		resolve({
			browser: true,
			preferBuiltins: true,
			dedupe: importee => importee === 'svelte' || importee.startsWith('svelte/')
			// dedupe: ['svelte']
		}),
		commonjs(),
		builtins(),
		// In dev mode, call `npm run start` once
		// the bundle has been generated
		!production && serve(),
		// Watch the `public` directory and refresh the
		// browser on changes when not in production
		// !production && livereload('public'),
		// If we're building for production (npm run build
		// instead of npm run dev), minify
		production && terser()
	],
	onwarn,
	watch: {
		clearScreen: false
	},
	input: 'src/service-worker.js',
	output: {
			file: 'public/service-worker.js',
			format: 'esm'
	},
	plugins: [
		replace({
			TIMESTAMP: Date.now()
		})
	]
};