[Feature]: Barrel files optimization in bundle: false mode

[SoonIter]

What problem does this feature solve?

Barrel files is a development model commonly used in development.

Stop using Barrel files

how-we-optimized-package-imports-in-next-js

maybe we can automatically optimize this behavior in the output of lib

import { foo } from './index' -> import { foo } from './components/foo/index.mjs'

What does the proposed API look like?

1