What does T do in TypeSript

Question

export declare function createEntityAdapter<T>(options?: {
    selectId?: IdSelector<T>;
    sortComparer?: false | Comparer<T>;
}): EntityAdapter<T>;

Can you please tell me what <T> does over here?

Answer 1

This is a TS Generics declaration.

T will be declared in runtime instead of compile time. So it can be any non declared variable