flatMap

Deprecation Notes

Renamed to mergeMap. Will be removed in v8.

const flatMap: { <T, O extends ObservableInput<any>>(project: (value: T, index: number) => O, concurrent?: number): OperatorFunction<T, ObservedValueOf<O>>; <T, O extends ObservableInput<...>>(project: (value: T, index: number) => O, resultSelector: undefined, concurrent?: number): OperatorFunction<...>; <T, R, O extends Observabl...;