rollup.config.js

import { defineConfig } from 'rollup'
import nodeResolve from '@rollup/plugin-node-resolve'
import babel from '@rollup/plugin-babel'
import replace from '@rollup/plugin-replace'
import typescript from 'rollup-plugin-typescript2'
import terser from '@rollup/plugin-terser'

const extensions = ['.ts']
const noDeclarationFiles = { compilerOptions: { declaration: false } }

const external = []

export default defineConfig([
  // CommonJS
  {
    input: 'src/index.ts',
    output: { file: 'dist/cjs/index.cjs', format: 'cjs', indent: false },
    external,
    plugins: [
      nodeResolve({
        extensions
      }),
      typescript({ useTsconfigDeclarationDir: true }),
      babel({
        extensions,
        plugins: [['./scripts/mangleErrors.cjs', { minify: false }]],
        babelHelpers: 'bundled'
      })
    ]
  },

  // ES
  {
    input: 'src/index.ts',
    output: { file: 'dist/es/index.js', format: 'es', indent: false },
    external,
    plugins: [
      nodeResolve({
        extensions
      }),
      typescript({ tsconfigOverride: noDeclarationFiles }),
      babel({
        extensions,
        plugins: [['./scripts/mangleErrors.cjs', { minify: false }]],
        babelHelpers: 'bundled'
      })
    ]
  },

  // ES for Browsers
  {
    input: 'src/index.ts',
    output: { file: 'dist/es/redux.mjs', format: 'es', indent: false },
    plugins: [
      nodeResolve({
        extensions
      }),
      replace({
        preventAssignment: true,
        'process.env.NODE_ENV': JSON.stringify('production')
      }),
      typescript({ tsconfigOverride: noDeclarationFiles }),
      babel({
        extensions,
        exclude: 'node_modules/**',
        plugins: [['./scripts/mangleErrors.cjs', { minify: true }]],
        skipPreflightCheck: true,
        babelHelpers: 'bundled'
      }),
      terser({
        compress: {
          pure_getters: true,
          unsafe: true,
          unsafe_comps: true
        }
      })
    ]
  }
])