rollup.config.js

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

import pkg from './package.json';

const root = process.platform === 'win32' ? path.resolve('/') : '/';

export default {
    input: './src/index.js',
    output: [
        {
            file: pkg.main,
            format: 'cjs',
            sourcemap: true
        },
        {
            file: pkg.module,
            format: 'es',
            sourcemap: true
        }
    ],
    external: id => !id.startsWith('.') && !id.startsWith(root),
    plugins: [
        babel({
            exclude: 'node_modules/**',
            runtimeHelpers: true
        }),
        resolve(),
        commonjs({
            include: 'node_modules/**'
        }),
        terser(),
        filesize()
    ]
};