Seemingly false alerm in monorepo: This syntax requires an imported helper but module 'tslib' cannot be found.

[vilicvane]

Bug Report

The project uses yarn workspaces and has many packages with structures like:

- node_modules/
- package.json
- packages/
   - app/
     - node_modules/ 
     - package.json
   - server
     - node_modules/
     - package.json

In my case "tslib" is added to every relevent nested package.json but obviously it's only present under root node_modules/.

🔎 Search Terms

🕗 Version & Regression Information

This changed between versions 4.4.3 and 4.5.0-beta

💻 Code

import * as ReactDOM from 'react-dom';

🙁 Actual behavior

packages/app/src/program/main.tsx:3:1 - error TS2354: This syntax requires an imported helper but module 'tslib' cannot be found.

3 import * as ReactDOM from 'react-dom';
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

🙂 Expected behavior

No error.

---

Let me know if a repro is needed.

[andrewbranch]

Yes, a repro is needed. Thanks!

[vilicvane]

https://github.com/vilic/bug-repros/tree/typescript-46288

Seems that "nodenext" just doesn't play along with "importHelpers".

[andrewbranch]

Oh, that’s probably fixed in #46156. Can you try again with the nightly?

[vilicvane]

That seems to have fixed the problem, thanks!