import svelte from 'rollup-plugin-svelte';
import replace from '@rollup/plugin-replace';
import resolve from '@rollup/plugin-node-resolve';
import commonjs from '@rollup/plugin-commonjs';
import { terser } from 'rollup-plugin-terser';

const production = !process.env.ROLLUP_WATCH;

export default {
	input: 'src/index.js',
	output: {
		name: 'app',
		format: 'esm',
		sourcemap: true,
		dir: 'public',
	},
	preserveEntrySignatures: false,
	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('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/rollup-plugin-commonjs
		resolve(),
		commonjs(),

		replace({
			'process.env.NODE_ENV': JSON.stringify(production ? 'production' : 'development')
		}),

		// If we're building for production (npm run build
		// instead of npm run dev), minify
		production && terser()
	],

	watch: {
		clearScreen: false
	}
};