@push-stream-std/push-paramap (0.0.5)

Published 2026-07-20 18:59:58 +00:00 by Dvorak

Set up this registry in your project .npmrc file:

@push-stream-std:registry=https://hub.kl1.tenere.ai/api/packages/push-stream-std/npm/

To install the package using npm, run the following command:

npm install @push-stream-std/push-paramap@0.0.5

or add it to the package.json file:

"@push-stream-std/push-paramap": "0.0.5"

For more information on the npm registry, see the documentation.

push-paramap

Parallel async map with configurable concurrency, maintaining output order.

Published as @push-stream-std/push-paramap.

Synopsis

import paraMap from '@push-stream-std/push-paramap';
import pushable from '@push-stream-std/push-pushable';
import concat from '@push-stream-std/push-concat';

const source = pushable();

source.pipe(paraMap((value, cb) => {
  setTimeout(() => cb(null, value * 2), 10);
}, 4)).pipe(concat((err, result) => {
  if (err) return console.error(err);
  console.log(result); // [2, 4, 6, 8]
}));

source.push(1);
source.push(2);
source.push(3);
source.push(4);
source.end();

Install

npm config set @push-stream-std:registry https://hub.kl1.tenere.ai/api/packages/push-stream-std/npm/
npm config set -- //hub.kl1.tenere.ai/api/packages/push-stream-std/npm/:_authToken "$PACKAGE_TOKEN"
npm install @push-stream-std/push-paramap

Description

A through stream that maps each value through an async callback, processing up to width items concurrently. Results are emitted in the original input order regardless of completion order. Each mapper receives (value, callback) and must call callback(err, result). Errors from any mapper terminate the stream immediately.

API

`paraMap(mapper, width?)`

Creates a parallel map through stream.

mapper (value, cb: (err, result) => void) => void – Async map function. Called with each value and a callback. If the callback receives an error, the stream ends with that error.
width number (default Infinity) – Maximum number of in-flight mapper invocations.
Returns A through stream with pipe(), resume(), abort(), write(), end(), paused, and ended.

Tests

npm test

Tests cover parallel execution with concurrency limit, output ordering preservation, error propagation from mapper callbacks, and end after all pending mappers complete.

Requirements

Node.js 18 or later. ESM only.

License

MIT

push-stream stream paramap parallel async

Details

npm

2026-07-20 18:59:58 +00:00

0

SEE LICENSE IN LICENSE

3.7 KiB

Assets (1)

push-paramap-0.0.5.tgz 3.7 KiB

Versions (5) View all

0.0.7

2026-07-21

0.0.6

2026-07-20

0.0.5

2026-07-20

0.0.4

2026-07-19

0.0.3