Typescript Autocompletion Not Working For Function Overloads

[MartinLoeper]

• VSCode Version: 1.25.1 1dfc5e5 x64
• OS Version: Linux version 4.15.0-32-generic Ubuntu

Steps to Reproduce:
I provided a small example of the issue (see screenshot below).

1. Create a function with two overloads
2. Try to invoke this function
3. Once you typed in the first parameter, the IDE recognizes that it matches the first overload's signature.
   However, the auto-completion suggest the literals for both overloads.

I expect the auto-completion to show "BW" and "BY" only!

Does this issue occur when all extensions are disabled?: Yes

The code:

export class MomentHolidayFactory {
    public a(input: Germany, second: GermanState): string;
    public a(input: Austria, second: AustrianState): string;

    public a(input: Country, second: State): string {
        return "test";
    }

    public holidays() {
        this.a("de", ""
    }
}

type Country = Germany & Austria;
type Germany = "de" | "De" | "DE" | "germany";
type Austria = "Au" | "au" | "AU" | "austria";

type State = GermanState & AustrianState;
type GermanState = "BW" | "BY";
type AustrianState = "Stmk" | "Vbg";

[mjbvz]

This issue was moved to microsoft/TypeScript#26892