post-build.js

import fs from 'node:fs';
import path from 'node:path';

const types = [
	{type: 'commonjs', name: 'cjs'},
	{type: 'module', name: 'mjs'},
];

for (const {type, name} of types) {
	const filePath = path.resolve(`./distribution/${name}/package.json`);
	fs.writeFileSync(filePath, JSON.stringify({type, types: './index.d.ts'}, null, 4));
}