flatMap

Signature - source.ts#L2247

function flatMap<T, U>(
    transform: (value: T, index: number) => Source<U>,
): Operator<T, U>1 function flatMap<T, U>(
2     transform: (value: T, index: number) => Source<U>,
3 ): Operator<T, U>

1	function flatMap<T, U>(
2	transform: (value: T, index: number) => Source<U>,
3	): Operator<T, U>