Suppose I have this :
const sub = new Subject<{ id: string; value: string; }>();
How can I get the generic type given to the Subject ?
const item: ??? = { id: '1', value: 'value' };
I am aware that I can declare an interface, or simply give the exact same type to my item. What I would like to know is if there is a way to get the generic type of another type in a more global way.
>Solution :
You can infer the generic type:
const sub = new Subject<{ id: string; value: string; }>();
type Unwrap<T extends Subject<unknown>> = T extends Subject<infer K> ? K : never;
type Item = Unwrap<typeof sub>;
var item: Item = {
id: '1',
value: '2'
}