The message This condition will always return true since the function is always defined is not shown

[a-tarasyuk]

TypeScript Version: 3.8.3

Code

const foo = {
    test() {
        return true;
    }
}

if (foo.test) {
    console.log(true);
}

Expected behavior:
The message This condition will always return true since the function is always defined should be shown for the code if (foo.test)

Actual behavior:
no message

Playground Link: Example

It seems that happens when childSymbol.id and testedFunctionSymbol.id equal to undefined.

if (childSymbol && childSymbol.id === testedFunctionSymbol.id) 

[j-oliveras]

Using the playground link, after any change (for example add a space at start) the error appears.

[j-oliveras]

Probably you already knows, but its a duplicate of #33792.

[sandersn]

Yep, thanks @j-oliveras!

[a-tarasyuk]

@sandersn I think it is similar to this issue #35557, however, it is not related to QF.

[sandersn]

Maybe, but this issue is fixed in master, whereas #35557 is not. I assumed incorrectly that it was a result of #33792, but I guess not.