I have library called lib.ts, it’s made from multiple files, like lib/part1.ts, lib/part2.ts.

And the lib.ts just re exports everything, content of lib.ts:

export * from './lib/part1.js'
export * from './lib/part2.js'

I would like to produce single file lib.mjs as ES module, with all parts merged, but the exports kept.

How can I do that, vite removes the exports.

The vite config:

import { defineConfig } from 'vite'
import { resolve } from 'path'

export default defineConfig({
  build: {
    rollupOptions: {
      input: {
        lib: resolve(__dirname, 'lib')
        app: resolve(__dirname, 'app')
      },
      output: {
        entryFileNames: '[name].mjs',
        dir: 'releases'
      },
      external: [
        'lib'
      ],
    }
  }
})

I also have the app.ts bundle. I don’t want the lib to be included in app, so it’s marked as external.