相关疑难解决方法(0)

在Javascript中,何时抛出此错误？

index.js

/**
 * Created by tushar.mathur on 24/12/15.
 */
'use strict'

const _ = require('lodash')
const Rx = require('rx')
const createDataStore = require('./src/createDataStore')

const fetch = x => Rx.Observable.fromPromise(window.fetch(x)) 
const parseJSON = x => Rx.Observable.fromPromise(x.json()) // Line: 11 (Where the exception is thrown)
var create = _.partial(createDataStore, fetch, parseJSON)
module.exports = {
  create,
  // Alias for legacy purposes
  createDataStore: create,
  createFetchStore: create
}

这是本机承诺错误吗？这意味着什么？谷歌显示没有找到结果.