callback2stream

callback2stream

Transform sync, async or generator function to Stream. Correctly handle errors and optional arguments.

Install

npm i callback2stream --save

Usage

For more use-cases see the tests

const callback2stream = require('callback2stream')

callback2stream

Create a stream from sync, async or generator function.

Params

• fn {Function}: Any kind of function.
• opts {Object}: Directly passed to through2 from promise2stream.
• returns {Function}: That when executed, returns transform stream, coming from promise2stream, using through2.

Example

var fs = require('fs')
var cb2stream = require('callback2stream')

var readFileStream = cb2stream(fs.readFile)
var stream = readFileStream('package.json', 'utf8')
stream
  .on('data', function (val) {
    var json = JSON.parse(val)
    console.log(json.name) // => 'callback2stream'
  })
  .once('error', console.error)
  .once('end', function () {
    console.log('reading finished')
  })

// you also have access to the
// contents with promise
stream.promise
  .then(JSON.parse, console.error)
  .then(function (val) {
    console.log(val.name) // => 'callback2stream'
  }, console.error)
  .catch(console.error)

Related

• letta: Let's move to promises! Drop-in replacement for co@4 (passing 100% tests), but… more | homepage
• limon: The pluggable JavaScript lexer. Limon = Lemon. | homepage
• postjson: Transforming JSON with plugins. | homepage
• promise2stream: Transform ES2015 Promise to Stream - specifically, Transform Stream. homepage
• promise2thunk: Convert (transform) promise to thunk, just like was in co@3 | homepage
• relike: Simple promisify a callback-style function with sane defaults. Support promisify-ing sync functions. | homepage
• stream-from-promise: Create streams from promises | homepage
• stream-to-promise: Convert streams (readable or writable) to promises | homepage
• through2: A tiny wrapper around Node streams2 Transform to avoid explicit subclassing noise | homepage
• thunk2promise: Transform or convert thunk to Bluebird Promise. | homepage
• value2stream: Transform any value to stream. Create stream from any value - string,… more | homepage

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.
But before doing anything, please read the CONTRIBUTING.md guidelines.

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