Angular2 ReferenceError：使用 webpack 時未定義系統

Question

我收到類似於以下內容的錯誤： Angular2 + webpack Uncaught ReferenceError: System is not defined

...或者

帶有 webpack 的 Angular 2 - 未捕獲的 ReferenceError：系統未定義

我正在使用最新的 npm package.json 設置：

http://angular.io/docs/ts/latest/guide/npm-packages.html

我沒有找到針對此問題的任何解決方案。 我正在使用 ASP.NET 本地 IIS 服務器。 項目從 Visual Studio 社區 2015 開始。

webpack.common.js ：

var webpack = require('webpack');
var HtmlWebpackPlugin = require('html-webpack-plugin');
var ExtractTextPlugin = require('extract-text-webpack-plugin');
var path = require('path');
var ProvidePlugin = require('webpack/lib/ProvidePlugin'); 

module.exports = {
    devtool: 'cheap-module-source-map',
    cache: true,
    debug: true,

    entry: {
        'polyfills': './polyfills.ts',
        'vendor': './vendor.ts',
        'main': './main.ts',
    },

    plugins: [
        new webpack.optimize.OccurenceOrderPlugin(true),
        new webpack.optimize.CommonsChunkPlugin({
            name: ['main', 'vendor', 'polyfills'],
            minChunks: Infinity
        }),
        new ProvidePlugin({
            jQuery: 'jquery',
            $: 'jquery',
            jquery: 'jquery'
        })
    ],

    module: {
        loaders: [
            { test: /\.ts$/, loaders: ['awesome-typescript-loader', 'angular2-template-loader'] },
            { test: /\.css$/, loaders: ['to-string-loader', 'css-loader'] },
            { test: /\.less$/, loader: 'raw-loader!less-loader' },
            { test: /\.html$/, loader: 'raw-loader' },
            { test: /\.(png|jpe?g|gif|svg|woff|woff2|ttf|eot|ico)$/, loader: 'file?name=assets/[name].[hash].[ext]' }
        ]
    },

    output: {
        publicPath: '/',
        filename: '[name].js',
        sourceMapFilename: '[name].map',
        chunkFilename: '[id].js'
    },

    htmlLoader: {
        minimize: false
    },

    devServer: {
        contentBase: '.',
        host: 'localhost',
        potr: 44305
    },

    resolve: {
        extensions: ['', '.ts', '.js', '.css', '.less']
    },

    node: {
        global: 1,
        crypto: 'empty',
        module: 0,
        Buffer: 0,
        clearImmediate: 0,
        setImmediate: 0
    }
};

webpack.config.js :

var webpack = require('webpack');
var path = require('path');
var webpackMerge = require('webpack-merge');
var commonConfig = require('./webpack.common.js');

// Webpack Config
var webpackConfig = {

    output: {
        filename: '[name].js'
    }

};

module.exports = webpackMerge(commonConfig, webpackConfig);
tsconfig.json:

{
  "compilerOptions": {
    "target": "es5",
    "module": "commonjs",
    "moduleResolution": "node",
    "rootDir": ".",
    "sourceMap": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "removeComments": false,
    "noImplicitAny": true,
    "suppressImplicitAnyIndexErrors": true
  },
  "exclude": [
    "node_modules"
  ],
  "awesomeTypescriptLoaderOptions": {
    "useWebpackText": true
  },
  "compileOnSave": true,
  "buildOnSave": false,
  "atom": {
    "rewriteTsconfig": false 
  }
}

vendors.ts ：

import '@angular/platform-browser';
import '@angular/platform-browser-dynamic';
import '@angular/core';
import '@angular/common';
import '@angular/http';
import '@angular/router';

import 'rxjs/Rx';

import 'jquery/dist/jquery';
import 'bootstrap/dist/js/bootstrap';
import 'angular2-notifications/components.js';
import 'moment';
import 'eonasdan-bootstrap-datetimepicker/src/js/bootstrap-datetimepicker.js';

polyfills.ts ：

import 'core-js/es6';
import 'core-js/es7/reflect';

require('zone.js/dist/zone');
require('zone.js/dist/long-stack-trace-zone');

Chrome console ：

core.umd.js:3468Error: Uncaught (in promise): ReferenceError: System is not defined
    at resolvePromise (https://localhost:44305/polyfills.js:7687:32)
    at https://localhost:44305/polyfills.js:7664:14
    at ZoneDelegate.invoke (https://localhost:44305/polyfills.js:7461:29)
    at Object.onInvoke (https://localhost:44305/vendor.js:6786:42)
    at ZoneDelegate.invoke (https://localhost:44305/polyfills.js:7460:35)
    at Zone.run (https://localhost:44305/polyfills.js:7354:44)
    at https://localhost:44305/polyfills.js:7720:58
    at ZoneDelegate.invokeTask (https://localhost:44305/polyfills.js:7494:38)
    at Object.onInvokeTask (https://localhost:44305/vendor.js:6777:42)
    at ZoneDelegate.invokeTask (https://localhost:44305/polyfills.js:7493:43)

Answer 1

和你一樣，我遵循了 Angular 2 指南，我希望我的應用程序能夠使用 Webpack 而不是 SystemJS 成功構建和運行。 對，沒錯！ 對我來說，原來是由延遲加載模塊引起的。

如果您在任何路由定義中指定“loadChildren”，Angular 2 默認使用 SystemJS 模塊加載器來檢索模塊。 除非您提供另一個加載程序（請參閱https://angular.io/docs/ts/latest/guide/router.html#!#asynchronous-routing ）

解決方案：為Webpack安裝一個lazy loader

• 安裝 npm 包 'angular2-router-loader' 作為開發人員。 依賴
• 將 'angular2-router-loader' 添加到 webpack 配置中的 TypeScript 加載器
• 您可能必須在“loadChildren”中指定帶有前導“./”的路徑（與絕對或“隱式相對”相反）
• 當它最終工作時，開心地建造、奔跑和跳躍

來源： https : //medium.com/@daviddentoom/angular-2-lazy-loading-with-webpack-d25fe71c29c1#.lmd8lnkos