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ESM – TypeError [ERR_UNKNOWN_FILE_EXTENSION]

See original GitHub issue

I get this error when trying the typescript example with updated dependencies:

TypeError [ERR_UNKNOWN_FILE_EXTENSION]:
    Unknown file extension ".ts" for /home/tolu/github/uvu/examples/typescript/tests/math.ts

An image for context 😄

Single tests files can be run via:

node --loader ts-node/esm test/math.ts

Issue Analytics

State:
Created 3 years ago
Reactions:2
Comments:9 (5 by maintainers)

Top GitHub Comments

2reactions

lukeedcommented, Nov 30, 2020

Hey, thanks!

What if the fix was to always use require/CommonJS mode if any -r/--require flag was defined?

As touched on here, ESM Node has --loader instead, and AFAIK cannot be hooked in outside of invoking node directly. And all require hooks need access to require.extensions (internal) in order to trigger X on loaded files.

1reaction

lukeedcommented, Dec 1, 2020

OK. The first “half” of the fix is now available in 0.5.1

If you still experience this issue after upgrading, please leave some information here so that it can reproduced! Hopefully it’s been resolved fully, but my suspicion that we’ve not seen the end of it… yet