rollup.config.mjs

import nodeResolve from '@rollup/plugin-node-resolve';
import replace from '@rollup/plugin-replace';
import fs from 'node:fs';
import path from 'node:path';

const plugins = [nodeResolve(), replace({ DEBUG: false, preventAssignment: true })];

export default [
	/* esm */
	{
		input: 'src/index.js',
		external: ['@jridgewell/sourcemap-codec'],
		plugins: [
			...plugins,
			{
				name: 'copy-typescript-files',
				closeBundle() {
					const base = path.resolve('./src/index.d.ts');
					fs.copyFileSync(base, path.resolve('./dist/magic-string.es.d.mts'));
					fs.copyFileSync(base, path.resolve('./dist/magic-string.cjs.d.ts'));
				},
			},
		],
		output: {
			file: 'dist/magic-string.es.mjs',
			format: 'es',
			exports: 'named',
			sourcemap: true,
		},
	},

	/* cjs */
	{
		input: 'src/index-legacy.js',
		external: ['@jridgewell/sourcemap-codec'],
		plugins,
		output: {
			file: 'dist/magic-string.cjs.js',
			format: 'cjs',
			exports: 'default',
			sourcemap: true,
		},
	},

	/* umd */
	{
		input: 'src/index-legacy.js',
		plugins,
		output: {
			file: 'dist/magic-string.umd.js',
			format: 'umd',
			exports: 'default',
			name: 'MagicString',
			sourcemap: true,
		},
	},
];