Unable to pass an awaited ArrayBuffer to a TypedArray constructor

[jyang14]

Bug Report

🔎 Search Terms

TypedArray, ArrayBuffer, Promise.then, await

🕗 Version & Regression Information

• This changed between versions v3.3.3333 and v3.5.1

⏯ Playground Link

Playground link with relevant code

💻 Code

const array = new Uint8Array(await Promise.resolve().then(() => new ArrayBuffer(10)))

🙁 Actual behavior

The above code throws the following error when passing to a TypedArray an awaited ArrayBuffer from a Promise involving a then call

No overload matches this call.
 The last overload gave the following error.
 Argument of type 'Iterable<number> | ArrayBuffer' is not assignable to parameter of type 'ArrayBuffer'.
 Type 'Iterable<number>' is missing the following properties from type 'ArrayBuffer': byteLength, slice, [Symbol.toStringTag]

🙂 Expected behavior

The code should work because the following will not throw an error as the follow examples don't throw an error (also in playground link):

// refactoring the arrayBuffer definition to a separate variable doesn't throw an error
const arrayBuffer = await Promise.resolve().then(() => new ArrayBuffer(10))
const array = new Uint8Array(arrayBuffer)

// without the "then" it doesn't throw an error
const array = new Uint8Array(Promise.resolve(new ArrayBuffer(10)))

[RyanCavanaugh]

See #40466

[typescript-bot]

This issue has been marked as a 'Duplicate' and has seen no recent activity. It has been automatically closed for house-keeping purposes.