rollup.config.js

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 sveltePreprocess from 'svelte-preprocess';
import typescript from '@rollup/plugin-typescript';
import fs from 'fs';
import path from 'path';
import replace from '@rollup/plugin-replace';

const production = !process.env.ROLLUP_WATCH;
const network = process.env.NETWORK || "dev";
const targetWeblets = process.env.TARGET_WEBLETS;

/**
 * 
 * @param { {
 * 	src: string,
 * 	outdir: string,
 * 	element?: boolean,
 * 	keepCss?: boolean
 * } } options 
 */
function build(options) {
	options = {
		element: false,
		keepCss: false,
		...options
	};

	const configs = {
		input: options.src, // 'src/main.ts',
		output: {
			sourcemap: false,
			format: 'iife',
			name: 'app',
			file: options.outdir // 'public/build/bundle.js'
		},
		plugins: [
			svelte({
				preprocess: sveltePreprocess({ sourceMap: !production }),
				compilerOptions: {
					dev: !production,
					customElement: options.element,
				}
			}),
			resolve({
				browser: true,
				dedupe: ['svelte']
			}),
			commonjs(),
			typescript({
				sourceMap: !production,
				inlineSources: !production
			}),
			production && terser(),
			replace({
				preventAssignment: true,
				values: {
					'process.env.NETWORK': `"${network}"`,
					'process.env.VERSION': `"${process.env.VERSION || "No version to show"}"`
				}
			})
		],
		watch: {
			clearScreen: false
		}
	};

	return configs;
}

function buildElements() {
	const dir = path.join(__dirname, 'src', 'elements');
	const outDir = `.build/build/elements/`;
	let files = fs.readdirSync(dir);
	if (targetWeblets) {
		files = targetWeblets.split(" ");
	}
	return files.map((f) => {
		const name = f.replace(".wc.svelte", "").toLocaleLowerCase();
		return build({
			src: `src/elements/${f}/index.ts`,
			outdir: outDir + `${name}.wc.js`,
			element: true,
			keepCss: true
		});
	});
}



export default buildElements();