web-stream-transform

web-stream-transform

Functional transform helpers for Web Streams — map, filter, take, batch, and tap

Install

npm install web-stream-transform

Usage

import {mapStream, filterStream, takeStream, batchStream, tapStream} from 'web-stream-transform';

const result = ReadableStream.from([1, 2, 3, 4, 5, 6])
	.pipeThrough(filterStream(x => x % 2 === 0))
	.pipeThrough(mapStream(x => x * 10))
	.pipeThrough(takeStream(2));
// Yields: 20, 40

API

mapStream(function_)

Returns a TransformStream that applies function_ to each chunk.

filterStream(function_)

Returns a TransformStream that only passes chunks where function_ returns true.

takeStream(count)

Returns a TransformStream that passes only the first count chunks then terminates.

batchStream(size)

Returns a TransformStream that collects chunks into arrays of size, flushing any remainder on close.

tapStream(function_)

Returns a TransformStream that calls function_ for side effects but passes chunks through unchanged.

Related

• node:stream/web - Node.js Web Streams API

License

MIT