Mathias Panzenböck11h ago
The #JavaScript testing framework #jest somehow breaks built-in classes so that `x instanceof Error` always gives false. (Same for Array.) This completely breaks error handling when running tests! `Error.isError(x)` seems to work, but #TypeScript doesn't know about it (for NodeJS 24 LTS, even though it has that method)! I'm hack-fixing it with this TypeScript declaration:
Show threadnicofrand
@bloody_albatross that's probably just a realm thing (for the JS part) : https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Execution_model#realms
JavaScript execution model - JavaScript | MDN

This page introduces the basic infrastructure of the JavaScript runtime environment. The model is largely theoretical and abstract, without any platform-specific or implementation-specific details. Modern JavaScript engines heavily optimize the described semantics.

MDN Web Docs
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Show threadMathias Panzenböck10h ago
@nicofrand Of course it is. But doesn't matter. It totally destroys error handling and is just insane that I have to work around the testing framework!