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Suggestion: use numeric literals for BYTES_PER_ELEMENT #59557

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#59567
Open
Suggestion: use numeric literals for BYTES_PER_ELEMENT#59557
#59567
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Domain: lib.d.tsThe issue relates to the different libraries shipped with TypeScriptThe issue relates to the different libraries shipped with TypeScriptExperience EnhancementNoncontroversial enhancementsNoncontroversial enhancementsHelp WantedYou can do thisYou can do thisSuggestionAn idea for TypeScriptAn idea for TypeScript
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@lionel-rowe

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@lionel-rowe
lionel-rowe
opened on Aug 8, 2024
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⚙ Compilation target

ES5+

⚙ Library

lib.es5.d.ts, lib.es2022.bigint.d.ts

Missing / Incorrect Definition

Suggesting to change the BYTES_PER_ELEMENT static and instance properties as follows:

interface Uint8Array {
    // ...
-   readonly BYTES_PER_ELEMENT: number;
+   readonly BYTES_PER_ELEMENT: 1;
    // ...
}
interface BigInt64ArrayConstructor {
    // ...
-   readonly BYTES_PER_ELEMENT: number;
+   readonly BYTES_PER_ELEMENT: 8;
    // ...
}

Etc.

Sample Code

declare function fn(bytesPerElement: 1 | 2 | 4 | 8): void
// currently reports "Argument of type 'number' is not assignable to parameter of type '1 | 2 | 4 | 8'".
fn(Uint32Array.BYTES_PER_ELEMENT)

Documentation Link

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/BYTES_PER_ELEMENT#examples

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    Domain: lib.d.tsThe issue relates to the different libraries shipped with TypeScriptThe issue relates to the different libraries shipped with TypeScriptExperience EnhancementNoncontroversial enhancementsNoncontroversial enhancementsHelp WantedYou can do thisYou can do thisSuggestionAn idea for TypeScriptAn idea for TypeScript

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