Typescript 包括在网页包中获取Aurelia中的polyfill

所以我注意到我在PhantomJs中遇到了这个错误，我认为包含polyfill是因为有一个

@type/whatwg fetch

Error: HttpClient requires a Fetch API implementation, but the current environment doesn't support it. You may need to load a polyfill such as https://github.com/github/fetch. in spec-bundle.js (line 18057)

我不确定如何在这个网页包中加载推荐的polyfill，我需要安装什么npm模块？如何将其添加到网页包（基于typescript weback骨架的网页包）

试过这个

import { Aurelia } from 'aurelia-framework';
import '../styles/styles.css';
import 'font-awesome/css/font-awesome.css';
import 'bootstrap/dist/css/bootstrap.css';
import 'bootstrap';
import * as Bluebird from 'bluebird';
import 'whatwg-fetch';
// we want font-awesome to load as soon as possible to show the fa-spinner

// comment out if you don't want a Promise polyfill (remove also from webpack.config.js)
Bluebird.config({ warnings: false });

export async function configure(aurelia: Aurelia) {
  aurelia.use
    .standardConfiguration()
    .developmentLogging();

  // Uncomment the line below to enable animation.
  // aurelia.use.plugin('aurelia-animator-css');
  // if the css animator is enabled, add swap-order="after" to all router-view elements

  // Anyone wanting to use HTMLImports to load views, will need to install the following plugin.
  // aurelia.use.plugin('aurelia-html-import-template-loader')

  await aurelia.start();
  aurelia.setRoot('app');

    // if you would like your website to work offline (Service Worker),
  // install and enable the @easy-webpack/config-offline package in webpack.config.js and uncomment the following code:
  /*
  const offline = await System.import('offline-plugin/runtime');
  offline.install();
  */
}

这是我安装的

npm ls whatwg-fetch                                                slave-vi
aurelia-skeleton-navigation-webpack@1.0.0 /home/xenoterracide/IdeaProjects/rpf-ui
└── whatwg-fetch@1.0.0

---

我可以在我的app bundle.js中看到fetch代码，但我仍然看到PhantomJS抛出上述错误。最简单的方法是使用包

同构fetch

，它提供了一个fetch polyfill，可以在节点和浏览器中工作（使用webpack和Browserify）

如果您只需要一个浏览器polyfill，您也可以使用包

whatwgfetch

Error: HttpClient requires a Fetch API implementation, but the current environment doesn't support it. You may need to load a polyfill such as https://github.com/github/fetch. in spec-bundle.js (line 18057)

---

一旦安装了

同构提取

或

whatwg提取

，只需在入口点开始处导入它，然后再导入所有其他非多边形填充：

import "isomorphic-fetch"; // or whatwg-fetch
// Other imports go here

---

就这些！在该导入窗口之后，如有必要，将对fetch进行多填充

似乎需要在设置的同一类中执行导入

HttpClient

。对于

typescript网页包

框架，这可能在

app.ts

import 'isomorphic-fetch';
import { Router, RouterConfiguration } from 'aurelia-router';
import { Logger } from 'aurelia-logging';
import { Container, LogManager, autoinject } from 'aurelia-framework';
import { Route } from './main/Route';
import { HttpClient } from 'aurelia-fetch-client';

@autoinject
export class App {
    router: Router;
    private log: Logger = LogManager.getLogger( App );

    constructor( container: Container ) {
        let client: HttpClient = new HttpClient;
        client.configure( config => {
            config.useStandardConfiguration()
                .withBaseUrl( "http://localhost:8080/" )
                .withDefaults( {
                    credentials: 'include'
                } );
        } );
        container.registerSingleton( HttpClient, () => client );
    }

---

更新的问题，看来什么是TWG fetch使用同构fetch？我仍然在获取PhantomJS错误

isomorphic fetch

在浏览器上下文中使用

whatwg fetch

。您仍然会遇到的错误是因为您在polyfill之前导入了Aurelia。polyfill应该是第一位的，进口的顺序在这里很重要。我今晚会试试，我把它放在那里，因为那是骨骼作为polyfill进口蓝鸟的地方。我明白了。我认为现在它可能无法工作，因为Fetch polyfill需要一个全局安装的Promise polyfill。我只需要从您的项目中完全删除Bluebird，安装

core js

并添加

import“core js/es6/promise”在获取polyfill导入之前。它将在任何地方为您提供标准的ES6承诺（在全球范围内作为
Promise
提供），因此我怀疑Aurelia也会接受这些承诺。有很多方法可以使用Bluebird来提供这种polyfill，Bluebird可能会稍微快一点，但在这种情况下，我认为将经典的全局ES6 polyfill与Fetch结合使用可能会更容易。