webpack 总结（写了个开头 想想还是不写了留着官网和别人博客地址）

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   关于webpack的资料大体分3处 ，一处是官网（纯英文，资料比较多）,一处是中文网（不建议，就如不知道谁说的一句话，讲的是1+1，而实际用的却是微积分难度），还有各大博客，知识点零散，无系统知识架构，所以只好慢慢根据官网总结。

配置文件config：可以自己写也可以默认的webpack init生成

配合npm 使用 

  "scripts": {
    "build": "webpack"
  },
可以用“--”传自定义参数进去，请大胆使用es2015里面的import/export

var path = require(‘path‘);

module.exports = {
  entry: ‘./app/index.js‘,
  output: {
    filename: ‘bundle.js‘,
    path: path.resolve(__dirname, ‘dist‘)  第一个参数是模块绝对路径
  }
};

当运行build命令之后就会在当前路径的基础上,参照dist生成文件

安装:

npm install webpack –g 至于全局和局部安装问题，一个是在npm的安装目录下 一个是在项目node_modules下,但是全局安装后还是需要局部安装，因为需要用到require，require无法引入全局安装的模块

"scripts": {
    "start": "webpack --config mywebpack.config.js"
}

下面是官方给的配置例子

var path = require(‘path‘);

module.exports = {
   entry: "./app/entry", //入口 

   output: {
      path: path.resolve(__dirname, "dist"), // string输出的目录
       filename: "bundle.js", // string 输出的名字
    publicPath: "/assets/", // string 静态资源目录

    library: "MyLibrary", // string,
    // the name of the exported library

    libraryTarget: "umd", // universal module definition
    // the type of the exported library

    /* Advanced output configuration (click to show) */
  },

  module: {
      rules: [
      // rules for modules (configure loaders, parser options, etc.)

      {
        test: /\.jsx?$/,
        include: [
          path.resolve(__dirname, "app")
        ],
        exclude: [
          path.resolve(__dirname, "app/demo-files")
        ],
        // these are matching conditions, each accepting a regular expression or string
        // test and include have the same behavior, both must be matched
        // exclude must not be matched (takes preferrence over test and include)
        // Best practices:
        // - Use RegExp only in test and for filename matching
        // - Use arrays of absolute paths in include and exclude
        // - Try to avoid exclude and prefer include

        issuer: { test, include, exclude },
        // conditions for the issuer (the origin of the import)

        enforce: "pre",
        enforce: "post",
        // flags to apply these rules, even if they are overridden (advanced option)

        loader: "babel-loader",
        // the loader which should be applied, it‘ll be resolved relative to the context
        // -loader suffix is no longer optional in webpack2 for clarity reasons
        // see webpack 1 upgrade guide

        options: {
          presets: ["es2015"]
        },
        // options for the loader
      },

      {
        test: "\.html$",

        use: [
          // apply multiple loaders and options
          "htmllint-loader",
          {
            loader: "html-loader",
            options: {
              /* ... */
            }
          }
        ]
      },

      { oneOf: [ /* rules */ ] },
      // only use one of these nested rules

      { rules: [ /* rules */ ] },
      // use all of these nested rules (combine with conditions to be useful)

      { resource: { and: [ /* conditions */ ] } },
      // matches only if all conditions are matched

      { resource: { or: [ /* conditions */ ] } },
      { resource: [ /* conditions */ ] }
      // matches if any condition is matched (default for arrays)

      { resource: { not: /* condition */ } }
      // matches if the condition is not matched
    ],

    /* Advanced module configuration (click to show) */
  },

  resolve: {
    // options for resolving module requests
    // (does not apply to resolving to loaders)

    modules: [
      "node_modules",
      path.resolve(__dirname, "app")
    ],
    // directories where to look for modules

    extensions: [".js", ".json", ".jsx", ".css"],
    // extensions that are used

    alias: {
      // a list of module name aliases

      "module": "new-module",
      // alias "module" -> "new-module" and "module/path/file" -> "new-module/path/file"

      "only-module$": "new-module",
      // alias "only-module" -> "new-module", but not "module/path/file" -> "new-module/path/file"

      "module": path.resolve(__dirname, "app/third/module.js"),
      // alias "module" -> "./app/third/module.js" and "module/file" results in error
      // modules aliases are imported relative to the current context
    },
    /* alternative alias syntax (click to show) */

    /* Advanced resolve configuration (click to show) */
  },

  performance: {
    hints: "warning", // enum
    maxAssetSize: 200000, // int (in bytes),
    maxEntrypointSize: 400000, // int (in bytes)
    assetFilter: function(assetFilename) { 
      // Function predicate that provides asset filenames
      return assetFilename.endsWith(‘.css‘) || assetFilename.endsWith(‘.js‘);
    }
  },

  devtool: "source-map", // enum
  // enhance debugging by adding meta info for the browser devtools
  // source-map most detailed at the expense of build speed.

  context: __dirname, // string (absolute path!)
  // the home directory for webpack
  // the entry and module.rules.loader option
  //   is resolved relative to this directory

  target: "web", // enum
  // the environment in which the bundle should run
  // changes chunk loading behavior and available modules

  externals: ["react", /^@angular\//],
  // Don‘t follow/bundle these modules, but request them at runtime from the environment

  stats: "errors-only",
  // lets you precisely control what bundle information gets displayed

  devServer: {
    proxy: { // proxy URLs to backend development server
      ‘/api‘: ‘http://localhost:3000‘
    },
    contentBase: path.join(__dirname, ‘public‘), // boolean | string | array, static file location
    compress: true, // enable gzip compression
    historyApiFallback: true, // true for index.html upon 404, object for multiple paths
    hot: true, // hot module replacement. Depends on HotModuleReplacementPlugin
    https: false, // true for self-signed, object for cert authority
    noInfo: true, // only errors & warns on hot reload
    // ...
  },

  plugins: [
    // ...
  ],
  // list of additional plugins


  /* Advanced configuration (click to show) */
}

 基于vue官方脚手架教程：别人博客

http://donglegend.com/2016/08/25/webpack%E9%82%A3%E4%BA%9B%E4%BA%8B%E5%84%BF04/#

webpack 总结（写了个开头 想想还是不写了留着官网和别人博客地址）

标签：icp   env   iss   hint   long   resolved   reset   host   ges   

原文地址：http://www.cnblogs.com/godbutton/p/6508767.html