React系列---Webpack环境搭建（二）不同环境不同配置

摘要：系列环境搭建一手动搭建系列环境搭建二不同环境不同配置系列环境搭建三打包性能优化实际项目中，往往不同环境有不同的构建需求。

React系列---Webpack环境搭建（一）手动搭建
React系列---Webpack环境搭建（二）不同环境不同配置
React系列---Webpack环境搭建（三）打包性能优化

实际项目中，往往不同环境有不同的构建需求。比如开发、测试和生产环境对应的后端接口地址不同，生产环境需要进行代码混淆、压缩等。

因此，往往还需要将webpack配置分成多个：

安装webpack-merge，用于合并配置：

npm install webpack-merge --save-dev

安装uglifyjs-webpack-plugin，用于js代码压缩：

npm install uglifyjs-webpack-plugin --save-dev

webpack -p也可以用于代码压缩。相对而言，使用uglifyjs-webpack-plugin，可以对压缩进行更灵活的控制。

拆分webpack.config.js为以下几个配置：

基础配置 webpack.base.config.js：

const path = require("path");
const webpack = require("webpack");

const ROOT_PATH = path.resolve(__dirname);
const SRC_PATH = path.resolve(ROOT_PATH, "src");
const BUILD_PATH = path.resolve(ROOT_PATH, "dist");

module.exports = {
    entry: {
        index: path.resolve(SRC_PATH, "index.jsx")
    },
    output: {
        path: BUILD_PATH,
        filename: "js/[name].[hash:5].js"
    },
    resolve: {
        extensions: [".js", ".jsx"]
    },
    module: {
        loaders: [
            {
                test: /.jsx?$/,
                loaders: ["eslint-loader"],
                include: SRC_PATH,
                enforce: "pre"
            }, {
                test: /.jsx?$/,
                loaders: ["babel-loader"],
                include: SRC_PATH,
                exclude: path.resolve(ROOT_PATH, "node_modules")
            }
        ]
    }
};

开发环境配置,webpack.dev.config.js：

const path = require("path");
const webpack = require("webpack");
const HtmlwebpackPlugin = require("html-webpack-plugin");
const merge = require("webpack-merge");
const baseConfig = require("./webpack.base.config.js");

const ROOT_PATH = path.resolve(__dirname);
const SRC_PATH = path.resolve(ROOT_PATH, "src");
const devConfig = merge(baseConfig, {
    devtool: "eval-source-map",
    plugins: [
        new webpack.DefinePlugin({
            "process.env.NODE_ENV": ""development""
        }),
        new HtmlwebpackPlugin({
            title: "react-webpack-demo",
            filename: "index.html",
            template: path.resolve(SRC_PATH, "templates", "index.html")
        })
    ]
});

module.exports = devConfig;

测试环境配置,webpack.test.config.js：

const path = require("path");
const webpack = require("webpack");
const HtmlwebpackPlugin = require("html-webpack-plugin");
const merge = require("webpack-merge")
const baseConfig = require("./webpack.base.config.js");

const ROOT_PATH = path.resolve(__dirname);
const SRC_PATH = path.resolve(ROOT_PATH, "src");
const testConfig = merge(baseConfig, {
    plugins: [
        new webpack.DefinePlugin({
            "process.env.NODE_ENV": ""test""
        }),
        new webpack.optimize.UglifyJsPlugin({
            sourceMap: true,
        }),
        new HtmlwebpackPlugin({
            title: "react-webpack-demo",
            filename: "index.html",
            template: path.resolve(SRC_PATH, "templates", "index.html"),
            minify: {
                removeComments: true,
                collapseWhitespace: true,
                removeRedundantAttributes: true,
                removeScriptTypeAttributes: true,
                removeStyleLinkTypeAttributes: true,
                removeAttributeQuotes: true
            }
        })
    ]
});

module.exports = testConfig;

生成环境配置,webpack.prod.config.js：

const path = require("path");
const webpack = require("webpack");
const HtmlwebpackPlugin = require("html-webpack-plugin");
const merge = require("webpack-merge")
const baseConfig = require("./webpack.base.config.js")

const ROOT_PATH = path.resolve(__dirname);
const SRC_PATH = path.resolve(ROOT_PATH, "src");
const prodConfig = merge(baseConfig, {
    plugins: [
        new webpack.DefinePlugin({
            "process.env.NODE_ENV": ""production""
        }),
        new webpack.optimize.UglifyJsPlugin({
            sourceMap: true,
        }),
        new HtmlwebpackPlugin({
            title: "react-webpack-demo",
            filename: "index.html",
            template: path.resolve(SRC_PATH, "templates", "index.html"),
            minify: {
                removeComments: true,
                collapseWhitespace: true,
                removeRedundantAttributes: true,
                removeScriptTypeAttributes: true,
                removeStyleLinkTypeAttributes: true,
                removeAttributeQuotes: true
            }
        })
    ]
});

module.exports = prodConfig;

修改package.json：

"scripts": {
    "start": "webpack-dev-server --hot --progress --config webpack.dev.config.js",
    "build:dev": "rimraf dist && webpack --progress --config webpack.dev.config.js",
    "build:test": "rimraf dist && webpack --progress --config webpack.test.config.js",
    "build": "rimraf dist && webpack --progress --config webpack.prod.config.js"
},

# 启动开发调试
npm run start
# 开发环境构建
npm run build:dev
# 测试环境构建
npm run build:test
# 生产环境构建
npm run build

项目中就可以像下面这样子调用后端接口

接口HOST定义，host.js：

if (process.env.NODE_ENV === "development") {
  module.exports = `http://192.168.1.101:8000`
} else if (process.env.NODE_ENV === "test") {
  module.exports = `http://192.168.1.102:8000`
} else {
  module.exports = `http://192.168.1.103:8000`
}

接口API定义，apis.js：

import host from "./host"

function getApi (api) {
  return host + api
}

export default {
  login: getApi("/login"),
  logout: getApi("/logout"),
  ...
}

代码：https://github.com/zhutx/reac...

React系列---Webpack环境搭建（一）手动搭建
React系列---Webpack环境搭建（二）不同环境不同配置
React系列---Webpack环境搭建（三）打包性能优化