Ready-mixin NPM

ready-mixin

You have class with async constructor and you don't want use callback in constructor or make inheritance from some event emitter? Try ready-mixin!

Installation

npm install ready-mixin

API

_ready(err, ...)

Resolve or reject ready promise.

ready()

Return ready promise.

return: Promise

onReady(callback, opts)

function callback is node-style callback function
Object opts
- boolean spread

isReady()

Return current ready status.

return: boolean

Examples

import { mixin } from 'core-decorators'
import ReadyMixin from 'ready-mixin'

@mixin(ReadyMixin)
class User {
  constructor (userId) {
    db.load(userId, (err, data) => {
      if (err === null) {
        this._data = data
      }

      this._ready(err)
    })
  }
}

let user = new User(0)
user.ready
  .then(() => {
    console.log('user was loaded!')
  }, (err) => {
    console.log('error on loading user!', err)
  })

spread in onReady

import { mixin } from 'core-decorators'
import ReadyMixin from 'ready-mixin'

@mixin(ReadyMixin)
class A {
  constructor () {
    setTimeout(() => { this._ready(null, 1, 2, 3) }, 1000)
  }
}

let a = new A()
a.onReady((err, v1, v2, v3) => {
  console.log(`Sum: ${v1 + v2 + v3}`) // Sum: 6
}, {spread: true})