全新的项目正在抛出以下错误
PASS client/src/App.test.js
node:internal/process/promises:246
triggerUncaughtException(err, true /* fromPromise */);
^
[UnhandledPromiseRejection: This error originated either by throwing inside of an async function without a catch block, or by rejecting a promis
我正在使用jest和testing-library/react编写单元测试。在此之前,我从未编写过任何单元测试。在写完测试之后,我得到了一个类似这样的错误。
FAIL src/__test__/components/Barchart.test.tsx
● Test suite failed to run
Call retries were exceeded
at ChildProcessWorker.initialize (node_modules/jest-worker/build/workers/ChildProcessWorker.js:193:21)
当执行下面的代码时,它将打开chrome,搜索栏中已经填充了这个data;,。我还没有在代码中提到过,但这种情况还是会发生的。而且,每次我试图运行代码时,都会出现很少的错误。
var webdriver = require('selenium-webdriver'),
By = webdriver.By,
until = webdriver.until;
var driver =new webdriver.Builder()
.forBrowser('chrome')
.build();
driver.get('htt
这段代码给出了这个错误
Warning: a promise was created in a handler but none were returned from it
var Observable = Rx.Observable;
var source = Observable.range(0, 3);
source
.flatMap(item => {
console.log('getting first promise');
return Observable.fromPromise(
new Promise((resolve
我的单元测试代码如下:
// function for my unit test to test exception
const mockServiceThrow = async () => { throw new Error('unit test error message'); };
const createContextAndDoc = () => new Promise((resolve, reject) => {
(async () => {
const res = await mockServiceThrow();
我的问题是:将处理从Promise对象中分离出来是否安全?
如果我这么做..。
var promise1 = new Promise(function(resolve, reject) {
var json = { "counter":0 }
console.log('execute now, worry later ...')
json.counter++;
console.log(json.counter)
resolve(json);
});
var then = function() {
promise1
我试图使用异步函数实现Promise.all函数。但是当其中一个承诺被拒绝的时候,我会犯一个错误。这就是我所做的实现:
async function Promise_All_II(promises){
let results = []
for(let p of promises)
results.push(await p)
return results
}
const takeTime = (value, time=1000) => new Promise(resolve => set
我有一个应用程序,在这个应用程序中,我必须在后台继续运行一些异步代码。我为我的应用程序创建了一个最小的模拟。
let promise_chain = Promise.resolve();
let rejected_promise_count = 0;
const interval_id = setInterval(
// Do some important polling. I will just always reject to demonstrate the problem.
() => {
promise_chain = promise_chain
在Angular 2中,使用rxjs,我试图将Promise转换为Observable。正如许多在线指南显示的那样,我在Observable上使用了fromPromise。这会抛出错误:
Property 'fromPromise' does not exist on type 'typeof Observable'.
Observable的导入方式如下:
import { Observable } from "rxjs/Observable";
尝试像其他运算符一样导入fromPromise会导致错误:
import 'rxjs/add
我想用Jest和酵素测试我的应用程序。我搞错了:
node:internal/process/promises:246
triggerUncaughtException(err, true /* fromPromise */);
^
[UnhandledPromiseRejection: This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not ha
Jest给了我一条错误信息--
node:internal/process/promises:245
triggerUncaughtException(err, true /* fromPromise */);
^
[UnhandledPromiseRejection: This error originated either by throwing inside of an
async function without a catch block, or by rejecting a promise which was not handled wit
我用摩卡和茶做测试。
我有一个函数,它接受另一个函数并对其进行包装,并在调用.call()方法时调用它,同时执行其他一些事情。
就像这样:
let tracker = trackerFactory({
watchFunction: somefunction
})
tracker.call() //does some things, calls somefunction, does more things...
现在,我正在尝试测试它是否处理一个函数,当调用返回一个拒绝的承诺时。
it("handles a rejection by the watched function"
好的,基本上我在我的机器人上的所有命令中添加了message.delete();,因为我想删除作者对命令的请求。 一切都很顺利,但当我DM机器人说一个命令,因为他不能删除消息,一条错误消息将会出现。 at RequestHandler.execute (c:\Users\Pascale\Desktop\DungeonBot\node_modules\discord.js\src\rest\RequestHandler.js:170:25)
at processTicksAndRejections (internal/process/task_queues.js:97:5)
&
我在guildMemberAdd事件上发送私人消息时遇到了问题。 代码如下: bot.on('guildMemberAdd', member => {
member.send('Welcome to the server.');
}); 这会导致以下错误: (node:11760) UnhandledPromiseRejectionWarning: DiscordAPIError: Cannot send messages to this user
at RequestHandler.execute (C:\Users\AckeeXZ\D
我正在用在玻璃钢土地上迈出一小步。我有以下代码:
# This will eventually get resolved with some value
dfd = Promise.defer()
promised = Bacon.fromPromise dfd.promise
# Values are occasionally being pushed in here
bus = new Bacon.Bus
# 1. attempt
bus.combine promised, (fromBus, fromPromise) ->
# This is never invoked
在javascript中,我如何拒绝承诺?简单地返回new Error('blah')不工作,错误控制台抛出".then不是一个函数“之类的东西。
因此,我包括了Promise.jsm,然后return Promise.reject(new Error('blah')),所以我的问题是:如果我在一个承诺:那么我不需要返回Promise.rject,可以返回新的错误,对吗?
//mainPromise chains to promise0 and chains to promise1
function doPromise(rejectRightAway)
我遵循了基本的示例,并且使用异步文件读取,我不能测试文件读取的失败。使用Mock-FS进行测试,成功的案例都通过了,但是失败生成了一个未处理的异常错误。 ReadFileContents.ts import * as NodeJSFS from 'fs';
export async function ReadFileContents(Directory:string, FileName:string):Promise<string> {
return new Promise<string>((resolve, reject) => {