Why can't I omit <someUnion, oneInterface> in TypeScript?

Kindly review this simple example:

interface A {
  a: number;
}
interface B {
  b: number;
}
interface C {
  c: number;
}

type ABC = A | B | C;

type omitA = Omit<ABC, A>;

https://i.sstatic.net/5Mun4.png

Unfortunately, I am unable to exclude an interface, but omitting a string property works flawlessly.

Is there a way to omit the interface?

Answer №1

The Omit type is used to exclude specific attributes from a given type (by specifying their name as a string, number, or symbol).

If you are trying to achieve this functionality, you should use the Exclude type, which was introduced in Typescript version 2.8.

type XYZ = X | Y | Z;

type excludeX = Exclude<XYZ, X>;

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