我在Visual Studio 2017中创建了一个.NET Core Angular 5 SPA。我对WebPack在上述过程中的工作方式感到非常困惑。例如， package.json 中的WebPack没有脚本：
{
"private": true,
"version": "0.0.0",
"scripts": {
"test": "karma start ClientApp/test/karma.conf.js"
},
"dependencies": {
"@angular/animations": "^5.0.2",
"@angular/cdk": "^5.0.0-rc.1",
"@angular/common": "^5.0.2",
"@angular/compiler": "^5.0.2",
"@angular/compiler-cli": "^5.0.2",
"@angular/core": "^5.0.2",
"@angular/forms": "^5.0.2",
"@angular/http": "^5.0.2",
"@angular/material": "^5.0.0-rc.1",
"@angular/platform-browser": "^5.0.2",
"@angular/platform-browser-dynamic": "^5.0.2",
"@angular/platform-server": "^5.0.2",
"@angular/router": "^5.0.2",
"@ngtools/webpack": "1.8.3",
"@types/webpack-env": "1.13.2",
"angular2-template-loader": "0.6.2",
"aspnet-prerendering": "^3.0.1",
"aspnet-webpack": "^2.0.1",
"awesome-typescript-loader": "3.4.0",
"bootstrap": "3.3.7",
"css": "2.2.1",
"css-loader": "0.28.7",
"es6-shim": "0.35.3",
"event-source-polyfill": "0.0.12",
"expose-loader": "0.7.4",
"extract-text-webpack-plugin": "3.0.2",
"file-loader": "1.1.5",
"html-loader": "0.5.1",
"isomorphic-fetch": "2.2.1",
"jquery": "3.2.1",
"json-loader": "0.5.7",
"preboot": "5.1.7",
"raw-loader": "0.5.1",
"reflect-metadata": "0.1.10",
"rxjs": "^5.5.2",
"style-loader": "0.19.0",
"to-string-loader": "1.1.5",
"typescript": "2.6.1",
"url-loader": "0.6.2",
"webpack": "3.8.1",
"webpack-hot-middleware": "2.20.0",
"webpack-merge": "4.1.1",
"zone.js": "0.8.18"
},
"devDependencies": {
"@types/chai": "4.0.5",
"@types/jasmine": "2.8.2",
"chai": "4.1.2",
"jasmine-core": "2.8.0",
"karma": "1.7.1",
"karma-chai": "0.1.0",
"karma-chrome-launcher": "2.2.0",
"karma-cli": "1.0.1",
"karma-jasmine": "1.1.0",
"karma-webpack": "2.0.6"
}
}
您能向我解释一下WebPack是如何发挥作用的吗？这是 webpack.config.js 文件：
const path = require('path');
const webpack = require('webpack');
const merge = require('webpack-merge');
const AotPlugin = require('@ngtools/webpack').AotPlugin;
const CheckerPlugin = require('awesome-typescript-loader').CheckerPlugin;
module.exports = (env) => {
// Configuration in common to both client-side and server-side bundles
const isDevBuild = !(env && env.prod);
const sharedConfig = {
stats: { modules: false },
context: __dirname,
resolve: { extensions: [ '.js', '.ts' ] },
output: {
filename: '[name].js',
publicPath: 'dist/' // Webpack dev middleware, if enabled, handles requests for this URL prefix
},
module: {
rules: [
{ test: /.ts$/, include: /ClientApp/, use: isDevBuild ? ['awesome-typescript-loader?silent=true', 'angular2-template-loader'] : '@ngtools/webpack' },
{ test: /.html$/, use: 'html-loader?minimize=false' },
{ test: /.css$/, use: [ 'to-string-loader', isDevBuild ? 'css-loader' : 'css-loader?minimize' ] },
{ test: /.(png|jpg|jpeg|gif|svg)$/, use: 'url-loader?limit=25000' }
]
},
plugins: [new CheckerPlugin()]
};
// Configuration for client-side bundle suitable for running in browsers
const clientBundleOutputDir = './wwwroot/dist';
const clientBundleConfig = merge(sharedConfig, {
entry: { 'main-client': './ClientApp/boot.browser.ts' },
output: { path: path.join(__dirname, clientBundleOutputDir) },
plugins: [
new webpack.DllReferencePlugin({
context: __dirname,
manifest: require('./wwwroot/dist/vendor-manifest.json')
})
].concat(isDevBuild ? [
// Plugins that apply in development builds only
new webpack.SourceMapDevToolPlugin({
filename: '[file].map', // Remove this line if you prefer inline source maps
moduleFilenameTemplate: path.relative(clientBundleOutputDir, '[resourcePath]') // Point sourcemap entries to the original file locations on disk
})
] : [
// Plugins that apply in production builds only
new webpack.optimize.UglifyJsPlugin(),
new AotPlugin({
tsConfigPath: './tsconfig.json',
entryModule: path.join(__dirname, 'ClientApp/app/app.module.browser#AppModule'),
exclude: ['./**/*.server.ts']
})
])
});
// Configuration for server-side (prerendering) bundle suitable for running in Node
const serverBundleConfig = merge(sharedConfig, {
resolve: { mainFields: ['main'] },
entry: { 'main-server': './ClientApp/boot.server.ts' },
plugins: [
new webpack.DllReferencePlugin({
context: __dirname,
manifest: require('./ClientApp/dist/vendor-manifest.json'),
sourceType: 'commonjs2',
name: './vendor'
})
].concat(isDevBuild ? [] : [
// Plugins that apply in production builds only
new AotPlugin({
tsConfigPath: './tsconfig.json',
entryModule: path.join(__dirname, 'ClientApp/app/app.module.server#AppModule'),
exclude: ['./**/*.browser.ts']
})
]),
output: {
libraryTarget: 'commonjs',
path: path.join(__dirname, './ClientApp/dist')
},
target: 'node',
devtool: 'inline-source-map'
});
return [clientBundleConfig, serverBundleConfig];
};
此外，还有另一个名为 webpack.config.vendor.js 的文件。那到底是什么？
所有webpack的东西都是通过MSBUILD过程（以及相应的中间件）来照顾的。为了找到您要寻找的参考，请查看项目的.csproj文件。这是我生成的一个示例：
<Target Name="DebugRunWebpack" BeforeTargets="Build" ... ">
...
<Message Importance="high" Text="Performing first-run Webpack build..." />
<Exec Command="node node_modules/webpack/bin/webpack.js --config webpack.config.vendor.js" />
<Exec Command="node node_modules/webpack/bin/webpack.js" />
</Target>
两个配置文件的原因很简单：一个是您的代码，资产等，另一个用于 vendor 代码，资产等，包括Angular，bootstrap和jQuery。