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deno check != tsc w.r.t. Object.keys() #28433

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NfNitLoop opened this issue Mar 8, 2025 · 1 comment
Open

deno check != tsc w.r.t. Object.keys() #28433

NfNitLoop opened this issue Mar 8, 2025 · 1 comment

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@NfNitLoop
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Version:

deno 2.2.3+0ef3f6b (canary, release, x86_64-pc-windows-msvc)
v8 13.4.114.11-rusty
typescript 5.7.3

Originally reported on Discord

type Point = {
  [key: string]: number
};

function processPoints(points: Point[]): string[] {
  // Should error on Object.keys(number), TS2345: Argument of type 'number' is not assignable to parameter of type 'object'.
  return Object.keys(points[3].foo);
}

deno check reports no errors.

But TSC says:

> deno run -ER npm:typescript@5.7.3/tsc --noEmit foo.ts
foo.ts:10:24 - error TS2345: Argument of type 'number' is not assignable to parameter of type 'object'.

10     return Object.keys(points[3].foo);
                          ~~~~~~~~~~~~~


Found 1 error in foo.ts:10
@NfNitLoop
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Image

VSCode shows an overload that seems to be the culprit.

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@NfNitLoop