iconify/packages/svelte/rollup.config.js

import fs from 'fs';
import svelte from 'rollup-plugin-svelte';
import resolve from '@rollup/plugin-node-resolve';
import commonjs from '@rollup/plugin-commonjs';
import pkg from './package.json';

// Copy Icon.svelte
try {
	fs.mkdirSync(__dirname + '/dist');
} catch (err) {}
['Icon.svelte'].forEach((file) => {
	fs.writeFileSync(
		__dirname + '/dist/' + file,
		fs.readFileSync(__dirname + '/src/' + file)
	);
});

// Create bundle
const name = pkg.name
	.replace(/^(@\S+\/)?(svelte-)?(\S+)/, '$3')
	.replace(/^\w/, (m) => m.toUpperCase())
	.replace(/-\w/g, (m) => m[1].toUpperCase());

export default [
	// Bundle everything
	{
		input: 'src/index.js',
		output: [
			{ file: pkg.module, format: 'es' },
			{ file: pkg.main, format: 'umd', name },
		],
		plugins: [svelte(), resolve(), commonjs()],
	},
	// Files included in Icon.svelte as bundles without dependencies
	{
		input: 'src/generate-icon.js',
		output: [
			{
				file: 'dist/generate-icon.js',
				format: 'es',
			},
		],
		plugins: [resolve(), commonjs()],
	},
];