Microsoft/TypeScript

Update `TypedArray` constructors to disallow invalid `(typedArray, byteOffset, byteLength)`

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#44.191 aberto em 20 de mai. de 2021

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BugDomain: lib.d.tsFix AvailableHelp Wanted

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Description

lib Update Request

Configuration Check

My compilation target is ES2020 and my lib is the default.

Missing / Incorrect Definition

TypedArray constructors allows passing (TypedArray, byteOffset, byteLength), when only byteOffset and byteLength are only used when passing in an ArrayBuffer

Sample Code

const buf = new ArrayBuffer(1024);
const uint8 = new Uint8Array(buf, 16, 128)
// No TS error, even though the `16` and `32` are completely ignored
const subUint8 = new Uint8Array(uint8, 16, 32)
subUint8.byteLength // Oops, this is 128, not 32.

Documentation Link

MDN on Uint8Array constructor

new Uint8Array(); // new in ES2017
new Uint8Array(length);
new Uint8Array(typedArray);
new Uint8Array(object);

new Uint8Array(buffer);
new Uint8Array(buffer, byteOffset);
new Uint8Array(buffer, byteOffset, length);

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