Typescript behaving strangely when inferring function return type
Today I stumbled across a thing in typescript, where it was inferring the return type of a function with an if statement very strangely
Playgroundlink: https://www.typescriptlang.org/play?#code/GYVwdgxgLglg9mABMOcBGBDATgCkwLwC5EwQBbNAUywEpiBvRA40i6xAX0QB9F6v6AKESIA9KJGSRAPQD8wxDGCI8GfDT4KRWSlBBYk9AhwUntu-YZMnBoSLARNsBHCjgtyVWppHipiOQUlFTcNISkdPQM+NzNOBUjLPmsgA
Why is ts inferring the return type as
Playgroundlink: https://www.typescriptlang.org/play?#code/GYVwdgxgLglg9mABMOcBGBDATgCkwLwC5EwQBbNAUywEpiBvRA40i6xAX0QB9F6v6AKESIA9KJGSRAPQD8wxDGCI8GfDT4KRWSlBBYk9AhwUntu-YZMnBoSLARNsBHCjgtyVWppHipiOQUlFTcNISkdPQM+NzNOBUjLPmsgA
Why is ts inferring the return type as
{foo?: undefined}{}
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