rollup.config.js

import { builtinModules } from 'node:module'
import esbuild from 'rollup-plugin-esbuild'
import dts from 'rollup-plugin-dts'
import resolve from '@rollup/plugin-node-resolve'
import commonjs from '@rollup/plugin-commonjs'
import json from '@rollup/plugin-json'
import alias from '@rollup/plugin-alias'
import { defineConfig } from 'rollup'
import pkg from './package.json'

const entries = {
  'index': 'src/index.ts',
  'server': 'src/server.ts',
  'types': 'src/types.ts',
  'client': 'src/client.ts',
  'utils': 'src/utils.ts',
  'cli': 'src/cli.ts',
  'constants': 'src/constants.ts',
  'hmr': 'src/hmr/index.ts',
  'source-map': 'src/source-map.ts',
}

const external = [
  ...builtinModules,
  ...Object.keys(pkg.dependencies || {}),
  ...Object.keys(pkg.peerDependencies || {}),
  'pathe',
  'birpc',
  'vite',
  'vite/types/hot',
  'node:url',
  'node:events',
  'node:vm',
]

const plugins = [
  resolve({
    preferBuiltins: true,
  }),
  json(),
  commonjs(),
  esbuild({
    target: 'node14',
  }),
]

export default defineConfig([
  {
    input: entries,
    output: {
      dir: 'dist',
      format: 'esm',
      entryFileNames: '[name].mjs',
      chunkFileNames: 'chunk-[name].mjs',
    },
    external,
    plugins,
    onwarn,
  },
  {
    input: entries,
    output: {
      dir: 'dist',
      format: 'cjs',
      entryFileNames: '[name].cjs',
      chunkFileNames: 'chunk-[name].cjs',
    },
    external,
    plugins: [
      alias({
        entries: [
          // cjs in Node 14 doesn't support node: prefix
          // can be dropped, when we drop support for Node 14
          { find: /^node:(.+)$/, replacement: '$1' },
        ],
      }),
      ...plugins,
    ],
    onwarn,
  },
  {
    input: entries,
    output: {
      dir: 'dist',
      entryFileNames: '[name].d.ts',
      format: 'esm',
    },
    external,
    plugins: [
      dts({ respectExternal: true }),
    ],
    onwarn,
  },
])

function onwarn(message) {
  if (['EMPTY_BUNDLE', 'CIRCULAR_DEPENDENCY'].includes(message.code))
    return
  console.error(message)
}