Implementing interface drops custom primitive types

[bpasero]

🔎 Search Terms

types, implement interface

🕗 Version & Regression Information

Version: 4.5.4

⏯ Playground Link

https://www.typescriptlang.org/play?#code/C4TwDgpgBA4gTgewK5gJIBMIDtgEsBmuEcUAvFFkgLYBGxA3AFCO47H4CGAxtAGIIIoAb0ZQxUGhzgAKXOgBcsRCgzY8hYgEpFANwRymAX2ZcANhwDOFqPwQBhc1ai4qYUxCprrt4aPGNDIA

💻 Code

type GroupIdentifier = number;

interface Foo {
    bar(id: GroupIdentifier): void;
}

class FooClass implements Foo {
    bar(id: number): void {
        throw new Error("Method not implemented.");
    }
}

🙁 Actual behavior

Implementing the interface via quick fix puts in bar(id: number): void

🙂 Expected behavior

I would have expected bar(id: GroupIdentifier): void

[MartinJohns]

Duplicate of #36761. Used search terms: implement interface alias in:title

[typescript-bot]

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