Function flatMap

flatMap(
fn: (data: any, options?: Pick<Stream.ArrayOptions, "signal">) => any,
options?: Stream.ArrayOptions,
): Readable
This method returns a new stream by applying the given callback to each chunk of the stream and then flattening the result.

It is possible to return a stream or another iterable or async iterable from fn and the result streams will be merged (flattened) into the returned stream.
Parameters
- fn: (data: any, options?: Pick<Stream.ArrayOptions, "signal">) => any
  a function to map over every chunk in the stream. May be async. May be a stream or generator.
- Optionaloptions: Stream.ArrayOptions
Returns Readable
a stream flat-mapped with the function fn.

Since
v17.5.0
- Defined in node_modules/@types/node/stream.d.ts:559