arktype•2mo ago

How to make an `Int32Array<SharedArrayBuffer>`?

Doing TypedArray.Int32 gives Int32Array<ArrayBufferLike> but I want Int32Array<SharedArrayBuffer> This probably applies to customizing any type of the int32 array but this is all I personally care about.

6 Replies

LukeAbbyOP•2mo ago

I'll probably just do

const sharedInt32Array = type("TypedArray.Int32").narrow((array, ctx): array is Int32Array<SharedArrayBuffer> =>
  array.buffer instanceof SharedArrayBuffer ? true : ctx.mustBe("an Int32Array with a SharedArrayBuffer buffer"),
);

const sharedInt32Array = type("TypedArray.Int32").narrow((array, ctx): array is Int32Array<SharedArrayBuffer> =>
  array.buffer instanceof SharedArrayBuffer ? true : ctx.mustBe("an Int32Array with a SharedArrayBuffer buffer"),
);

But I would've figured there'd be a built in way.

ssalbdivad•2mo ago

This isn't possible yet but @etius is working on default parameters for generics that would enable this. Same for just Array

LukeAbbyOP•2mo ago

Understandable limitation.

ssalbdivad•2mo ago

Actually kinda crazy that TS doesn't default Array to Array<unknown>

LukeAbbyOP•2mo ago

Agreed tbh kinda annoying they don't have a "first-use inference" for cases like Array they talk all about how unused generics in a function are an anti-pattern but then Array, Set, and all sorts of collections in the std-lib don't have guardrails against it

ssalbdivad•2mo ago

Yeah the never[] stuff feels pretty bad and is so easy to encounter as a new user

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How to make an `Int32Array<SharedArrayBuffer>`?

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