[Bug]: Nothing exports from esm barrel exports files (bundleless mode)

[xc2]

Version

  System:
    OS: macOS 15.1
    CPU: (12) arm64 Apple M2 Max
    Memory: 81.77 MB / 32.00 GB
    Shell: 3.7.1 - /opt/homebrew/bin/fish
  Browsers:
    Chrome: 130.0.6723.92
    Safari: 18.1
  npmPackages:
    @rslib/core: ^0.0.16 => 0.0.16

Details

There's no export statement found in the esm output of barrel exports files.

E.g.

source: https://github.com/xc2/barrel-mjs-repro/blob/558e556275e0a587ced4adf7cca0197eaf33fe22/src/barrel.js
output: https://github.com/xc2/barrel-mjs-repro/blob/558e556275e0a587ced4adf7cca0197eaf33fe22/dist/barrel.js
usage:

• node: https://github.com/xc2/barrel-mjs-repro/blob/558e556275e0a587ced4adf7cca0197eaf33fe22/node-test.js
• bun: https://github.com/xc2/barrel-mjs-repro/blob/558e556275e0a587ced4adf7cca0197eaf33fe22/package.test.js

Reproduce link

https://github.com/xc2/barrel-mjs-repro/tree/558e556275e0a587ced4adf7cca0197eaf33fe22

Reproduce Steps

bun run --bun build:rslib
bun test
node node-test.js

[fi3ework]

Adding this to package.json

  "pnpm": {
    "overrides": {
      "@rspack/core": "1.1.0"
    }
  }

will fix the bug. Export star from external files fixing PR are landed in 1.1.0. So an override is required (I don't know much about Bun, I tested it using pnpm :P )

The barrel file would be like:

import "./foo.js";
export * from "./foo.js";
 // CONCATENATED MODULE: ./src/barrel.js

The first line should be striped as a known issue, still under working.

But this reproduction recalls me that: Rslib relies on a minimal version of @rspack/core among ^1.0.0, but it's prone to not be fresh enough. We might need to check @rspack/core version inside Rslib preflight, and throw some warning/error to user.

[xc2]

Thank you @fi3ework , will try it today

[xc2]

It works as expected with rspack 1.1.0