rollup.config.js

// @ts-check

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

import pkg from './package.json' with { type: 'json' }

const external = [...Object.keys(pkg.dependencies), ...builtinModules.flatMap(m => [m, `node:${m}`]), 'fsevents']

export default defineConfig([
  {
    input: ['src/index.ts', 'src/cli.ts'],
    output: {
      dir: 'dist',
      chunkFileNames: 'velite-[hash].js'
    },
    external,
    plugins: [json(), commonjs(), nodeResolve(), esbuild({ target: 'node18' })]
  },
  {
    input: 'src/index.ts',
    output: {
      file: 'dist/index.d.ts'
    },
    external,
    plugins: [
      dts({ respectExternal: true }),
      {
        name: 'flatten-declare-module',
        generateBundle: (_, bundle) => {
          for (const fileName in bundle) {
            const chunk = bundle[fileName]
            if (chunk.type === 'chunk') {
              chunk.code = chunk.code.replace(/\ndeclare module ['"].+['"] {([^]+?)\n}/g, '$1')
              // (_, inner) => inner.split('\n').map(line => line.replace(/^    /, '')).join('\n')
            }
          }
        }
      }
    ]
  }
])