rollup.config.js

import json from '@rollup/plugin-json'
import babel from '@rollup/plugin-babel'
import { terser } from 'rollup-plugin-terser'
import resolve from '@rollup/plugin-node-resolve'
import commonjs from '@rollup/plugin-commonjs'
import typescript from '@rollup/plugin-typescript'

const extensions = ['.js', '.ts']

const pkg = {
    name: 'GeneratorJs',
    format: 'umd'
}

const excludeFiles = {
    exclude: 'node_modules/**' // only transpile our source code
}

export default {
    input: 'src/index.ts',
    output: [
        {
            ...pkg,
            file: 'dist/Generator.js'
        },
        {
            ...pkg,
            file: 'dist/Generator.min.js',
            plugins: [terser()] // minifies
        }
    ],
    plugins: [
        json(), // converts .json files to ES6 modules.
        resolve(),
        commonjs(),
        typescript(),
        babel({
            extensions,
            babelHelpers: 'bundled',
            include: ['src/**/*']
        })
    ],
    context: 'window'
}