kittycad.ts/rollup.config.js

import { babel } from '@rollup/plugin-babel'
import commonjs from '@rollup/plugin-commonjs'
import json from '@rollup/plugin-json'
import { nodeResolve } from '@rollup/plugin-node-resolve'
import { terser } from 'rollup-plugin-terser'
import pkg from './package.json'

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

const plugins = [
  json(),
  nodeResolve({ extensions }),
  commonjs(),
  babel({
    extensions,
  }),
  terser(),
]

export default [
  {
    input: 'src/index.ts',
    external: [
      Object.keys(pkg.dependencies || {}),
      Object.keys(pkg.peerDependencies || {}),
    ].flat(),
    output: [
      {
        file: pkg.module,
        format: 'esm',
      },
      {
        file: pkg.main,
        format: 'cjs',
      },
    ],
    plugins,
  },
  {
    input: 'src/index.ts',
    output: [
      {
        name: pkg.name,
        file: pkg.browser,
        format: 'umd',
      },
    ],
    plugins,
  },
]