Can a union type be transformed into an interface in Typescript?
My Desired Outcome
If we have a union type A:
type A = 'one' | 'two' | 'three';
I want to convert it to interface B:
interface B {
one: boolean;
two: boolean;
three: boolean;
}
Discover the Magic of Mapped Types with this simple example:
type X = 'red' | 'blue' | 'green';
type Y = {
[item in X]: boolean;
};
Y results in:
{
red: boolean;
blue: boolean;
green: boolean;
}
And don't forget, as Aleksey L. suggests, there's a handy utility type called Record:
type Y = Record<X, boolean>;
With mapped types, you can even vary the property types using conditional types:
type X = 'red' | 'blue' | 'green';
type Y = {
[item in X]: item extends 'red' ? number : boolean;
};
Y transforms into:
{
red: number;
blue: boolean;
green: boolean;
}
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