async-iterator-pipe

Pipe between async iterators and streams.

Install

npm install async-iterator-pipe

API

pipe(source, ...stages)

The source should be an async iterable. Node.js readable streams have experimental support for async iterators, so those work too. The stages should be a sequence of streams or functions that accept an async iterator and return a new async iterator to transform or receive the values from the source or previous stage in the sequence.

The final stage in the sequence will be returned, much like stream.pipe(target) returns the target on Node.js streams.

const pipe = require('async-iterator-pipe')
const http = require('http')

async function* upper (iterator) {
  for await (let chunk of iterator) {
    yield chunk.toString().toUpperCase()
  }
}

const server = http.createServer(async (req, res) => {
  try {
    req.setEncoding('utf8')
    await pipe(req, upper, res)
  } catch (err) {
    res.writeHead(500, {
      'content-type': 'text/plain'
    })
    res.end(err.message)
  }
})

server.listen(3000)

Copyright (c) 2019 Stephen Belanger

Licensed under MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.