import { IParallelEnumerable , TypedData } from "../../types" ; import { BasicParallelEnumerable } from "../BasicParallelEnumerable" ; import { nextIterationAsync } from "./_nextIterationAsync" ; import { nextIterationWithIndexAsync } from "./_nextIterationWithIndexAsync" ; type SelectAsyncFunc = { param source param selector returns < TSource , OUT > ( source , selector ) : IParallelEnumerable < OUT > ; param source param key returns < TSource extends { [ key ] : Promise < TResult > ; } , TKey extends keyof TSource , TResult > ( source , selector ) : IParallelEnumerable < TResult > ; } ; export const selectAsync = < TSource extends { [ key ] : Promise < TResult > ; } , TResult > ( source , keyOrSelector ) : IParallelEnumerable < TResult > => { let generator ; if ( typeof keyOrSelector === "function" ) { if ( keyOrSelector . length === 1 ) { generator = nextIterationAsync ( source , keyOrSelector as ( x : TSource ) => Promise < TResult > ) ; } else { generator = nextIterationWithIndexAsync ( source , keyOrSelector ) ; } } else { generator = nextIterationAsync ( source , ( x ) => ( x [ keyOrSelector ] ) ) ; } return new BasicParallelEnumerable ( generator ) ; } ;