While reviewing a project code recently, I came across some declarations in TypeScript that were unfamiliar to me:
export interface SomeInterface<T> {
<R>(paths: string[]): Observable<R>;
<R>(Fn: (state: T) => R): Observable<R>;
}
I am curious about the syntax in TS using <R> before a function typing like:
(paths: string[]) : Observable<R>Explaining that the requirement of having a generic method with <R> is essential for implementations of this interface. If we take the example:
<R>(paths: string[]): Observable<R>One suitable method that adheres to this template would be:
function bar<R>(paths: string[]): Observable<R> {
// implement function here
}
It's very much basic.
When placed within the function, it pertains solely to that specific function and does not impact the entire interface.
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