Node22 under ESM, tsx running error? SyntaxError: The requested module '../a.js' does not provide an export named 'TestService'?

[zurmokeeper]

Acknowledgements

• I read the documentation and searched existing issues to avoid duplicates
• I understand this is a bug tracker and anything other than a proven bug will be closed
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Minimal reproduction URL

https://github.com/zurmokeeper/20250228-tsx-node22-bug

Problem & expected behavior (under 200 words)

Node v22.12.0 Executing npm run test in the root directory, reports an error.

SyntaxError: The requested module '../a.js' does not provide an export named 'TestService'

Not so under node 20.18.1, tsx version v4.19.3.

[mtmacdonald]

In a project with .js files that import ESM functions from .ts files (an old codebase) I'm also hitting SyntaxError: The requested module ... does not provide an export named ... errors.

My codebase doesn't use "type": "module" in package.json yet. I am able to build and run the entrypoint with esbuild directly. I can also confirm the above error only happens in Node 22 or Node 23. But for Node 20, tsx handles this fine:

Following.

[mtmacdonald]

There is an active PR672 for Node 22 support from October - but the tests don't pass (so probably TSX doesn't support Node 22 yet).

[Antelope-IT]

Looking at that PR 672, Only some of the tests are failing; tests for node v22.14.0 are already included some of which are passing and some of which are failing. Tests with node version 22.6.0 are passing. So there is some support for Node v22 just not the current LTS version.

Through experimentation I think it can be seen that this bug was caused by a change in Node v22.10.0: that is; my code works with Node 22.9.0 but fails with the above error when run with Node 22.10.0

This is when trying to import from *.cjs in to an ESM module (*.ts with type: module)

The code compiles/builds with tsc, its only when it runs under mocha with tsx for unit tests that this bug occurs.

[aantia]

This is the same issue as #614, or at least closely related, based on it only occurring on Node versions >=22.10.
I assume it's due to this item in the changelog: https://nodejs.org/en/blog/release/v22.10.0#new-module-sync-exports-condition

[michaelfaith]

Are there any known workarounds that anybody's found for this?

[ashphy]

vite-node can be used as an alternative workaround.

[privatenumber]

Fixed in https://github.com/privatenumber/tsx/releases/tag/v4.20.0