waffle/frontend/rollup.config.mjs

import svelte from 'rollup-plugin-svelte';
import commonjs from '@rollup/plugin-commonjs';
import resolve from '@rollup/plugin-node-resolve';
import terser from '@rollup/plugin-terser';
import css from 'rollup-plugin-css-only';
import copy from 'rollup-plugin-copy';

const production = !process.env.ROLLUP_WATCH;

export default {
	input: 'src/main.js',
	output: {
		sourcemap: true,
		format: 'iife',
		name: 'app',
		file: 'public/build/bundle.js'
	},
	plugins: [
		svelte({
			compilerOptions: {
				// 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({ output: '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,
			dedupe: ['svelte']
		}),
		commonjs(),

		// Watch the `public` directory and refresh the
		// browser on changes when not in production
		//!production && livereload('public'),

		// Copy fonts
		copy({
			targets: [
				{ src: "node_modules/@fontsource/material-icons-outlined/files/material-icons-outlined-all-400-normal.woff2", dest: "public/build/files" },
				{ src: "node_modules/@fontsource-variable/open-sans/files/open-sans-latin-wght-*", dest: "public/build/files" },
			]
		}),

		// If we're building for production (npm run build
		// instead of npm run dev), minify
		production && terser()
	],
	watch: {
		clearScreen: false
	}
};