1.创建 package.json 项目
npm init
2.安装 webpack, 并且设置为项目依赖：
npm install webpack --save-dev
当然你必须之前已经在 -g 下安装了 webpack
3.创建一个 webpack.config.js 文件，这个文件是 webpack 工作的参考。
我们对着 https://webpack.js.org/configuration/ 这个文档来创建 webpack.config.js 文件。
webpack.config.js 文件：
const path = require('path');
module.exports = {
entry: "./app/entry", // string | object | array
// Here the application starts executing
// and webpack starts bundling
output: {
// options related to how webpack emits results
path: path.resolve(__dirname, "dist"), // string
// the target directory for all output files
// must be an absolute path (use the Node.js path module)
filename: "bundle.js", // string
// the filename template for entry chunks
publicPath: "/assets/", // string
// the url to the output directory resolved relative to the HTML page
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: {
// configuration regarding modules
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 "only-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) */
}
实例：
const path = require('path');
module.exports = {
// 入口文件
entry: "./app/main.js",
// 出口文件
output: {
path: path.resolve(__dirname, "dist"), // string
filename: "all.js" // string
}
}
至此，我们的 webpack 就已经可以进行标准的 CMD 模块化开发了。
4.我们引入 babel-loader 翻译 ES6：
npm install --save-dev babel-loader npm install --save-dev babel-core npm install --save-dev babel-preset-es2015
我们参考 https://github.com/babel/babel-loader 改变 webpack.config.js 文件：
const path = require('path');
module.exports = {
// 入口文件
entry: "./app/main.js",
// 出口文件
output: {
path: path.resolve(__dirname, "dist"), // string
filename: "all.js" // string
},
module: {
rules: [
{
test: /.js$/,
exclude: /(node_modules|bower_components)/,
use: {
loader: 'babel-loader',
options: {
presets: ['es2015']
}
}
}
]
}
}
友情提醒：webpack1 和 2 在配置上差别最大的就是 loader 的书写方法。
module --> rules --> test / exclude / use 属性，这是标准的 webpack2 的写法。
5.此时运行
webpack
命令，将自动的使用 CMD 构建 app 文件夹中的 main.js 文件，并且使用 babel 翻译。
6.下面继续配置 react：
npm install --save-dev react npm install --save-dev react-dom
配置 解析 JSX 语法：
npm install --save-dev babel-preset-react
至此，我们已经配置完毕 react 起步的所有的依赖，我们目前的 package.json 文件：
{
"name": "01_helloworld",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo "Error: no test specified" && exit 1"
},
"author": "",
"license": "ISC",
"devDependencies": {
"babel-core": "^6.26.0",
"babel-loader": "^7.1.2",
"babel-preset-es2015": "^6.24.1",
"babel-preset-react": "^6.24.1",
"react": "^16.2.0",
"react-dom": "^16.2.0",
"webpack": "^2.4.1"
}
}
.