ERR_UNKNOWN_FILE_EXTENSION on typescript files (broken TS support on node 22.14)

[fregante]

Version

v22.14.0

Platform

Darwin 192.168.88.98 24.3.0 Darwin Kernel Version 24.3.0: Thu Jan  2 20:24:16 PST 2025; root:xnu-11215.81.4~3/RELEASE_ARM64_T6000 arm64

Subsystem

No response

What steps will reproduce the bug?

echo "import 'node:console'" > file.ts
node file.ts

How often does it reproduce? Is there a required condition?

100%

What is the expected behavior? Why is that the expected behavior?

Support is documented here https://nodejs.org/api/typescript.html#type-stripping

What do you see instead?

node:internal/modules/esm/get_format:219
  throw new ERR_UNKNOWN_FILE_EXTENSION(ext, filepath);
        ^

TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts" for ~/file.ts
    at Object.getFileProtocolModuleFormat [as file:] (node:internal/modules/esm/get_format:219:9)
    at defaultGetFormat (node:internal/modules/esm/get_format:245:36)
    at defaultLoad (node:internal/modules/esm/load:120:22)
    at async ModuleLoader.loadAndTranslate (node:internal/modules/esm/loader:514:32)
    at async ModuleJob._link (node:internal/modules/esm/module_job:115:19) {
  code: 'ERR_UNKNOWN_FILE_EXTENSION'
}

Node.js v22.14.0

Additional information

Feels like I'm missing something. Why does this not work? This also fails

$ echo "console.log(1 as number)" > file.ts
$ node file.ts --experimental-strip-types

SyntaxError: missing ) after argument list

This fails regardless of tsconfig presence

[ljharb]

Both of these examples run fine for me on node 23; i can reproduce the issue on 22.14 - so it might be a fixed bug that just hasn't been backported to 22 yet?

[aduh95]

Feels like I'm missing something. Why does this not work? This also fails

$ echo "console.log(1 as number)" > file.ts
$ node file.ts --experimental-strip-types

The order of args matter, you should get better results with node --experimental-strip-types file.ts

[aduh95]

Unflagging has not been backported to v22.14.0 (doc can be found at https://nodejs.org/docs/latest-v22.x/api/typescript.html#type-stripping), and AFAICT using the flag works well, so I'm going to go ahead and close this. Feel free to reopen/comment if I missed something.