Autocomplete breaks in overloaded generic function

[colinhacks]

Bug Report

Autocomplete doesn't work in an overloaded generic function.

🔎 Search Terms

autocomplete vscode overload generic

🕗 Version & Regression Information

This is the behavior in every version I tried (4.1+ and nightly), and I reviewed the FAQ for entries about this.

⏯ Playground Link

Playground link with relevant code

💻 Code

type Shape = { foo: boolean };

function blarg<T>(shape: Shape): any;
function blarg<T>(shape: () => Shape): any;
function blarg(arg: any) {
  return arg;
}

blarg({ foo:true }); // autocomplete works here
blarg(() => ({ foo:true })); // but not here

Note that both functions are generic. This behavior occurs even though the generic parameter is unused. After removing the generic, autocomplete works fine for both overloads.

🙁 Actual behavior

In the first call to blarg (which uses the overload that expects an object), when you start typing f-o-o, the key name foo will be autosuggested.

In the second call to blarg (which uses the overload that expects an object-returning function), foo doesn't autocomplete when you start typing it.

If that found autocompletion only works on the first overload, in order of how the overloads are defined. In the playground, if you reverse the order of the two overloads, you will see the behavior switch.

🙂 Expected behavior

Autocompletion should work in all overloads.

[MartinJohns]

See: #46927 (comment)

[fatcerberus]

I’m not sure that’s the same issue, given that

After removing the generic, autocomplete works fine for both overloads.