Angular + Amazon-Cognito-identity-js，我为什么会出错：全局未定义 [英] Angular + amazon-cognito-identity-js, why am I getting error: global is not defined

问题描述

从命令行：

ng new sandbox
cd .\sandbox\
ng serve

打开 http：// localhost：4200 / 。

npm install --save amazon-cognito-identity-js

内部 \src\app\sign-up\sign-up.component.ts 添加以下代码行：

import * as AmazonCognitoIdentity from 'amazon-cognito-identity-js';

添加构造函数：

  constructor() {
    new AmazonCognitoIdentity.CognitoUserPool({});
  }

刷新 http：// localhost：4200 / 。

页面为空白。出现控制台错误：

Page is blank. There is a console error:

Uncaught ReferenceError: global is not defined
    at Object../node_modules/buffer/index.js (index.js:43)
    at __webpack_require__ (bootstrap:76)
    at Object../node_modules/amazon-cognito-identity-js/es/AuthenticationHelper.js (AuthenticationHelper.js:1)
    at __webpack_require__ (bootstrap:76)
    at Object../node_modules/amazon-cognito-identity-js/es/index.js (index.js:1)
    at __webpack_require__ (bootstrap:76)
    at Object../src/app/app.component.ts (main.js:94)
    at __webpack_require__ (bootstrap:76)
    at Object../src/app/app.module.ts (app.component.ts:9)
    at __webpack_require__ (bootstrap:76)

解决此错误的最佳方法是什么？

What is the best way to resolve this error?

推荐答案

将此作为最后一行 /src/polyfills.ts

(window as any).global = window

这篇关于Angular + Amazon-Cognito-identity-js，我为什么会出错：全局未定义的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！