playwright-typescript-module-bug's Introduction

Playwright Typescript + Module bug

Minimal reproduction of issue 15862. Using @playwright/test version 1.42.0.

Working example

Branch main is the working branch. Run npm test to verify baseline behaviour.

❯ npm test

> [email protected] test
> playwright test tests


Running 1 test using 1 worker

  ✓  1 tests/test.spec.ts:3:5 › it works (7ms)

  1 passed (220ms)

Broken example (.mts extension)

Switch to the mts-extension branch to and run the same command (npm test) to experience one flavour of "Unknown file extension"

❯ git checkout mts-extension
Switched to branch 'mts-extension'
❯ npm test

> [email protected] test
> playwright test tests

TypeError: Unknown file extension ".mts" for /[REDACTED]/playwright-typescript-module-bug/tests/test.spec.mts
Error: No tests found.
Make sure that arguments are regular expressions matching test files.
You may need to escape symbols like "$" or "*" and quote the arguments.

Broken example (type "module")

Switch to the type-module branch to and run the tests again to experience the second flavour of "Unknown file extension"

❯ git checkout type-module
Switched to branch 'type-module'
❯ npm test

> [email protected] test
> playwright test tests

TypeError: Unknown file extension ".ts" for /[REDACTED]/playwright-typescript-module-bug/tests/test.spec.ts
Error: No tests found.
Make sure that arguments are regular expressions matching test files.
You may need to escape symbols like "$" or "*" and quote the arguments.

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