Cannot assign Uint8Array type to Uint8Array variable created with constructor

🔎 Search Terms

uint8array

🕗 Version & Regression Information

• This changed between versions 5.7.3 and 5.6.3
• This changed in commit or PR #59417
• This is the behavior in every version I tried, and I reviewed the FAQ for entries about Uint8Arrays
• I was unable to test this on prior versions because Uint8Array was not generic before 5.7.3

⏯ Playground Link

https://www.typescriptlang.org/play/?target=11&ts=5.8.3#code/GYVwdgxgLglg9mABAcwKZQIICcuIBQCUAXIgKoxhQAc2WAhgJ6IDeAUIoluiFkmKgHcyFarUZ4ADAVYBfVqwA26RHRyIAvIn5DylGjnFTWq3JrSYcheUqgqcAJhK7RBppu3C9YhpOkn7GijotFZAA

💻 Code

function getArr (): Uint8Array {
  return new Uint8Array(0)
}

let arr = new Uint8Array(0)
arr = getArr() // fails compilation with TS2322

let arr2: Uint8Array = new Uint8Array(0)
arr2 = getArr() // this is fine

🙁 Actual behavior

TS2322 is thrown during compilation.

🙂 Expected behavior

I should be able to assign a value of type Uint8Array to a variable initialised with the Uint8Array constructor without specifying extra generics or types.

Additional information about the issue

The compilation error is:

Type 'Uint8Array<ArrayBufferLike>' is not assignable to type 'Uint8Array<ArrayBuffer>'.
  Type 'ArrayBufferLike' is not assignable to type 'ArrayBuffer'.
    Type 'SharedArrayBuffer' is missing the following properties from type 'ArrayBuffer': resizable, resize, detached, transfer, transferToFixedLength(2322)