remove-el-from-type.ts

export type Letters = 'a' | 'b' | 'c';

type RemoveC<TType> = TType extends 'c' ? never : TType;

type WithoutC = RemoveC<Letters>;

// Without C is not of type 'a' | 'b'
// We can return different mebers of the type or manipulate them. Returning never removes the element
// You can replace never with anything e.g. 'd' which means typeWithoutC will now be equal to 'a' | 'b' | 'd'
// This can be applied to enums too