Array.prototype.at not type guarded

[qwelias]

Bug Report

🔎 Search Terms

array at type guard

🕗 Version & Regression Information

• This is the behavior in every version I tried, and I reviewed the FAQ for entries about type guards

⏯ Playground Link

Playground link with relevant code

💻 Code

const arr: Array<{}> = []
let obj: {}

if (arr[0]) {
    obj = arr[0]
    obj = arr.at(0) // error
}

🙁 Actual behavior

arr.at(0) returns {} | undefined

🙂 Expected behavior

arr.at(0) returns {} because arr[0] returns {}

[whzx5byb]

See #45551

[typescript-bot]

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