# stream-via

> stream-via

Latest version **1.0.4** (published 2017-06-01) · MIT license · 0 weekly downloads

## Install

```sh
npm install stream-via
pnpm add stream-via
yarn add stream-via
bun add stream-via
```

## Health

**Score 25/100 (F)** — status: abandoned.

Positive: no vulnerabilities.

Warnings: low downloads; no types; no esm support.

Negative: abandoned.

## Facts

| | |
|---|---|
| Version | 1.0.4 |
| Published | 2017-06-01 |
| First published | 2015-07-03 |
| Weekly downloads | 0 |
| License | MIT |
| TypeScript types | none |
| Module format | CommonJS |
| Node | >=0.10.0 |
| Dependencies | 0 |
| Known vulnerabilities | 0 |
| Install scripts | no |
| GitHub stars | 0 |
| Author | Lloyd Brookes |
| Maintainers | 75lb |
| Keywords | through, stream, process, chunk, transform |

## Links

- npm: https://www.npmjs.com/package/stream-via
- Repository: https://github.com/75lb/stream-via
- Homepage: https://github.com/75lb/stream-via#readme
- Issues: https://github.com/75lb/stream-via/issues
- npm.io page: https://npm.io/package/stream-via

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## Recent versions

- 1.0.4 (latest) — 2017-06-01
- 1.0.3 — 2016-04-14
- 1.0.2 — 2016-04-14
- 1.0.1 — 2016-02-05
- 1.0.0 — 2016-02-05
- 0.1.1 — 2015-12-22
- 0.1.0 — 2015-07-03
- 0.0.0 — 2015-07-03

## README

[![view on npm](http://img.shields.io/npm/v/stream-via.svg)](https://www.npmjs.org/package/stream-via)
[![npm module downloads](http://img.shields.io/npm/dt/stream-via.svg)](https://www.npmjs.org/package/stream-via)
[![Build Status](https://travis-ci.org/75lb/stream-via.svg?branch=master)](https://travis-ci.org/75lb/stream-via)
[![Dependency Status](https://david-dm.org/75lb/stream-via.svg)](https://david-dm.org/75lb/stream-via)
[![js-standard-style](https://img.shields.io/badge/code%20style-standard-brightgreen.svg)](https://github.com/feross/standard)

# stream-via
Process each chunk of a stream via the supplied function. Useful for meddling inside a stream pipeline. Works in both string/Buffer and object modes.

## Synopsis

Replace all instances of the `a` character with `4`.

```js
const via = require('stream-via')
const fs = require('fs')

process.stdin
  .pipe(via(function (chunk) {
    return chunk.toString().replace(/a/g, '4')
  }))
  .pipe(process.stdout)
```

Output:
```
$ echo 'twat' | node example/simple.js
tw4t
```

# API

<a name="module_stream-via"></a>

## stream-via

* [stream-via](#module_stream-via)
    * [via(throughFunction, [options])](#exp_module_stream-via--via) ⇒ [<code>Duplex</code>](https://nodejs.org/api/stream.html#stream_class_stream_duplex) ⏏
        * [.async(throughFunction, [options])](#module_stream-via--via.async) ⇒ [<code>Duplex</code>](https://nodejs.org/api/stream.html#stream_class_stream_duplex)
        * [~throughFunction](#module_stream-via--via..throughFunction) : <code>function</code>

<a name="exp_module_stream-via--via"></a>

### via(throughFunction, [options]) ⇒ [<code>Duplex</code>](https://nodejs.org/api/stream.html#stream_class_stream_duplex) ⏏
**Kind**: Exported function  
**Params**

- throughFunction [<code>throughFunction</code>](#module_stream-via--via..throughFunction) - a function to process each chunk
- [options] <code>object</code> - passed to the returned stream constructor

<a name="module_stream-via--via.async"></a>

#### via.async(throughFunction, [options]) ⇒ [<code>Duplex</code>](https://nodejs.org/api/stream.html#stream_class_stream_duplex)
**Kind**: static method of [<code>via</code>](#exp_module_stream-via--via)  
**Params**

- throughFunction [<code>throughFunction</code>](#module_stream-via--via..throughFunction) - a function to process each chunk
- [options] <code>object</code> - passed to the returned stream constructor

<a name="module_stream-via--via..throughFunction"></a>

#### via~throughFunction : <code>function</code>
**Kind**: inner typedef of [<code>via</code>](#exp_module_stream-via--via)  
**Params**

- chunk <code>buffer</code> | <code>string</code>
- enc <code>string</code>
- done <code>function</code> - only used in `via.async`, call it like so: `done(err, returnValue)`.



* * *

&copy; 2015-17 Lloyd Brookes \<75pound@gmail.com\>. Documented by [jsdoc-to-markdown](https://github.com/jsdoc2md/jsdoc-to-markdown).

---
_Source: https://npm.io/package/stream-via · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._