Package Exports

run-callback

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (run-callback) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

run-callback

Run async or sync callbacks, such as gulp tasks.

The main ideas are borrowed from orchestrator.

Usage

var run = require('run-callback')
var thunkify = run.thunkify

promise = run(callback, ...args)

Run callback with args, and return a promise to fetch the results, which is always an Array.

callback

Type: Function

callback can be made asynchronous if it does one of the following:

Return a promise

run(function () {
  return new Promise(function (resolve) {
    process.nextTick(function () {
      resolve('done')
    })
  })
})
.then(function (res) {
  // 'done'
  console.log(res[0])
})

Return a stream

var Readable = require('stream').Readable

var src = ['beep', '\n', 'boop']
run(function () {
  var stream = createStream(src)
  stream.pipe(process.stdout)
  return stream
})
.then(function () {
  console.log('\n')
  // `[]`
  console.log(src)
})

function createStream(source) {
  var rs = Readable()
  rs._read = function () {
    if (source.length) {
      this.push(source.pop())
    } else {
      this.push(null)
    }
  }
  return rs
}

Accept one more argument than declared

run(function (a, b, next) {
  process.nextTick(function () {
    next(null, a + b, a - b)
  })
}, 2, 1)
.then(function (res) {
  // `[3, 1]`
  console.log(res)
})

run.thunkify(fn, context)

Return a new function to run fn later with a list of arguments.

var task = run.thunkify(function (a, b, next) {
  process.nextTick(function () {
    next(null, a + b, a - b)
  })
})

task(2, 1).then(function (res) {
  // `[3, 1]`
  console.log(res)
})