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TS does not recompile correctly when using a combination of project references, wildcard re-exports and watch mode #35468

wereHamster opened this issue Dec 3, 2019 · 0 comments


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@wereHamster wereHamster commented Dec 3, 2019

The simplest example I could come up with is this (full example available as github repo):

Setup: Two projects, main and pure. The index file of pure uses a wildcard re-export from another file which defines an interface type. The main project uses the interface type.

I start tsc in watch mode. Then I add a field to the interface type, which should cause a type error in the main project, but tsc remains quiet, reporting no errors. Restarting tsc does not help.


  • TypeScript reports the error when not started in watch mode (ie. when I start it manually once before making the change, and then again after making the change).
  • TypeScript reports the error when I import the session.ts file directly instead of going through the pure/index.ts file.
  • VS Code (TS 3.7.2) reports type error correctly.

Search Terms: project references, reexports


Clone the repo, install tsc (I tried with 3.8.0-dev.20191203), start tsc in watch mode (./node_modules/.bin/tsc --build src), and then add a new field to the Session type (file: src/pure/session.ts), and save the file.

Expected behavior: tsc should report a type error in the src/main/index.ts file, where the Session type is used.

Actual behavior: tsc remains quiet and does not report any errors.

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