rollup.config.mjs

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

const defaultNodeResolveConfig = {};
const nodeResolvePlugin = nodeResolve(defaultNodeResolveConfig);

const commonPlugins = [
  nodeResolvePlugin,
  babel.default({
    presets: ['@babel/preset-env'],
    babelHelpers: 'bundled',
  }),
  commonjs(),
];

const developmentPlugins = [
  ...commonPlugins,
  replace({
    'process.env.NODE_ENV': JSON.stringify('development'),
  }),
];

const productionPlugins = [
  ...commonPlugins,
  replace({
    'process.env.NODE_ENV': JSON.stringify('production'),
  }),
  terser({ mangle: false }),
];

const external = ['state-local'];

export default [
  {
    input: 'src/index.js',
    external,
    output: {
      dir: 'lib/cjs/',
      format: 'cjs',
      exports: 'named',
      preserveModules: true,
    },
    plugins: commonPlugins,
  },
  {
    input: 'src/index.js',
    external,
    output: {
      dir: 'lib/es/',
      format: 'es',
      preserveModules: true,
    },
    plugins: commonPlugins,
  },
  {
    input: 'src/index.js',
    output: {
      file: 'lib/umd/monaco-loader.js',
      format: 'umd',
      name: 'monaco_loader',
    },
    plugins: developmentPlugins,
  },
  {
    input: 'src/index.js',
    output: {
      file: 'lib/umd/monaco-loader.min.js',
      format: 'umd',
      name: 'monaco_loader',
    },
    plugins: productionPlugins,
  },
];