import { builtinModules } from 'module'
import { Plugin, build } from 'vite'
import resolve from 'vite-plugin-resolve'

export default function esm2cjs(modules: string[]): Plugin {
  return resolve({
    ...modules.reduce((memo, moduleId) => Object.assign(memo, {
      async [moduleId](args) {
        await build({
          plugins: [
            {
              name: 'vite-plugin[node:mod-to-mod]',
              enforce: 'pre',
              resolveId(source) {
                if (source.startsWith('node:')) {
                  return source.replace('node:', '')
                }
              },
            }
          ],
          build: {
            outDir: args.dir,
            minify: false,
            emptyOutDir: false,
            lib: {
              entry: require.resolve(moduleId),
              formats: ['cjs'],
              fileName: () => `${moduleId}.js`,
            },
            rollupOptions: {
              external: [
                ...builtinModules,
              ],
            },
          },
        })
      },
    } as Parameters<typeof resolve>[0]), {}),
  })
}