4.5.0-dev.20211029: Does not throw error `TS5056: Cannot write file '/to/file/path' because it would be overwritten by multiple input files.`

[sosukesuzuki]

Bug Report

🔎 Search Terms

TS5056, because it would be overwritten by multiple input files

🕗 Version & Regression Information

• This changed between versions 4.4.4 and 4.5.0-dev.20211029

⏯ Playground Link

This bug cannot be reproduced in Playground.

💻 Code

Sorry this bug cannot be reproduced as as simple code. Instead of I've created the repository to reproduce this.

https://github.com/sosukesuzuki-sandbox/ts-4.5-bug-reproduce

🙁 Actual behavior

Does not throw error TS5056: Cannot write file '/to/file/path' because it would be overwritten by multiple input files.

🙂 Expected behavior

Throw error TS5056: Cannot write file '/to/file/path' because it would be overwritten by multiple input files.

[DanielRosenwasser]

Isn't this correctly catching an error now? The two files would have been written to the same output .js file.

If you're using a bundler or similar build tool that does its own compilation, you can turn --noEmit on and this should work.

[andrewbranch]

The error is correct and it’s gone from 4.5.

It seems that matchFiles is broken in 4.5; it’s not picking up the TSX file at all. Investigating.