rollup.config.js

import path from 'path';
import babel from 'rollup-plugin-babel';
import commonjs from '@rollup/plugin-commonjs';
import resolve from '@rollup/plugin-node-resolve';
import { terser } from 'rollup-plugin-terser';
import typescript from 'rollup-plugin-typescript2';
import url from '@rollup/plugin-url';

const PACKAGE_ROOT_PATH = process.cwd();
const INPUT_FILE = path.join(PACKAGE_ROOT_PATH, 'lib/index.ts');
// eslint-disable-next-line @typescript-eslint/no-var-requires
const pkg = require(path.join(PACKAGE_ROOT_PATH, 'package.json'));

function makeExternalPredicate(externalArr) {
	if (!externalArr.length) {
		return () => false;
	}
	const pattern = new RegExp(`^(${externalArr.join('|')})($|/)`);
	return (id) => pattern.test(id);
}

function getExternal() {
	const external = Object.keys(pkg.peerDependencies || {});
	const allExternal = [...external, ...Object.keys(pkg.dependencies || {})];

	return makeExternalPredicate(allExternal);
}

export default {
	input: INPUT_FILE,
	external: getExternal(),
	output: [
		{
			file: path.resolve(PACKAGE_ROOT_PATH, 'dist/index.js'),
			format: 'cjs',
			sourcemap: true,
		},
		{
			file: path.resolve(PACKAGE_ROOT_PATH, 'dist/index.es.js'),
			format: 'es',
			sourcemap: true,
		},
	],
	plugins: [
		url(),
		resolve(),
		babel({
			exclude: 'node_modules/**',
		}),
		typescript({
			tsconfigOverride: {
				compilerOptions: {
					declarationDir: path.resolve(PACKAGE_ROOT_PATH, './typings'),
					declarationMap: true,
				},
				include: [path.resolve(PACKAGE_ROOT_PATH, './lib')],
				project: path.resolve(__dirname, 'tsconfig.json'),
			},
			rollupCommonJSResolveHack: true,
			useTsconfigDeclarationDir: true,
			// objectHashIgnoreUnknownHack: true,
		}),
		commonjs(),
		terser(),
	],
};