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ReadableBase.prototype.map - stream - Node documentation
method ReadableBase.prototype.map

Usage in Deno

import { ReadableBase } from "node:stream";
ReadableBase.prototype.map(
fn: (
data: any,
options?: Pick<ArrayOptions, "signal">,
) => any
,
options?: ArrayOptions,
): Readable

This method allows mapping over the stream. The fn function will be called for every chunk in the stream. If the fn function returns a promise - that promise will be awaited before being passed to the result stream.

Parameters

fn: (
data: any,
options?: Pick<ArrayOptions, "signal">,
) => any

a function to map over every chunk in the stream. Async or not.

optional
options: ArrayOptions

Return Type

Readable

a stream mapped with the function fn.