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本文主要介绍了关于webpack配置的最佳实践，本文分享的实践具有以下的优势：
- 使用happypack提升打包速度。
- 使用MD5 hash可以生成文件版本，进行版本控制
- 在非单页面的系统中支持多个入口的配置
- 模板中可以利用htmlplugin输出一些配置性的信息
- 支持devserver，支持本地json数据的mock
一、webpack最佳实践中的需求
1.热加载
2.语法校验
3.js打包
4.模板打包
二、解决方案
1.webpack.config.json
var path = require('path');
var fs = require('fs');
var exec = require('child_process').exec;
var HappyPack = require('happypack');
var merge = require('webpack-merge');
var webpack = require('webpack');
var WebpackMd5Hash = require('webpack-md5-hash');
var HtmlwebpackPlugin = require('html-webpack-plugin');
var ROOT_PATH = path.resolve(__dirname);
var APP_PATH = path.resolve(ROOT_PATH, 'app');
var BUILD_PATH = path.resolve(ROOT_PATH, __dirname+'/devserver/public');
//取出页面文件映射
function getHtmlPluginArr() {
var data = JSON.parse(fs.readFileSync('entryconf.json', 'utf-8'));
var pageList = data.pageList;
var resultObj = {
"pluginArr": [],
"entryObj": {}
};
for (var index = 0; index < pageList.length; index++) {
var element = pageList[index];
var entry = element.entry;
//通过对app.json中src的路径截取获得分发路径
var filename = (function () {
var filenameStr = entry.split("./app/page/")[1];
return filenameStr.substr(0, filenameStr.lastIndexOf("."));
})();
var title = element.title;
var extra = element.extra;
resultObj.entryObj[filename] = entry;
//利用路径一部分来进行HtmlwebpackPlugin的chunks
resultObj.pluginArr.push(
new HtmlwebpackPlugin({
chunks: [filename], //当前页面js
title: title,
extra: extra,//包含页面额外的配置信息
template: "app/" + "template.ejs",
filename: 'views/'+filename + '.ejs',
chunksSortMode: "dependency"//按chunks的顺序对js进行引入
})
);
//HappyPack, loader多进程去处理文件
resultObj.pluginArr.push(
new HappyPack({ id: 'html' }),
new HappyPack({ id: 'css' }),
new HappyPack({ id: 'js' }),
new HappyPack({ id: 'tpl' })
);
}
return resultObj;
}
var appJsonObj = getHtmlPluginArr();
/**通用配置 */
var commonConfig = {
entry: appJsonObj.entryObj,
module: {
loaders: [
{ test: /\.html$/, loader: "html?minimize=false", happy: {id: "html"} },
{ test: /\.json$/, loader: "json" },
{ test: /\.scss|\.css$/, loaders: ["style", "css", "sass"], happy: {id: "css"} },
{ test: /\.(?:jpg|gif|png)$/, loader: 'url?limit=10240&name=images/[name]-[hash:10].[ext]' },
{ test: /\.handlebars/, loader: "handlebars", query: { helperDirs: [APP_PATH + "/helper"] }, happy: {id: "tpl"} },
{ test: /\.js$|\.jsx$/, exclude: /(node_modules|bower_components)/, loader: 'babel', query: { presets: ['es2015'] }, happy: {id: "js"} },
]
},
output: {
path: BUILD_PATH,
filename: "js/[name].js"
},
externals: {
"jquery": "jQuery"
},
//配置短路径引用
resolve: {
extensions: ['', '.js', '.json', '.scss','.vue'],
alias: {
vue : 'vue/dist/vue.js'
}
},
plugins: appJsonObj.pluginArr,
cache: true
}
module.exports = merge(commonConfig, {
output: {
publicPath: '/',
path: BUILD_PATH,
filename: "js/[name]-[chunkhash:10].js"
},
plugins: [
new webpack.optimize.UglifyJsPlugin({ minimize: true }),
new WebpackMd5Hash()
]
});
</div>
2.模板文件的配置：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>
<%= htmlWebpackPlugin.options.title || '上单'%>
</title>
</head>
<body>
<div id="main-container"></div>
<% if (htmlWebpackPlugin.options.extra&&htmlWebpackPlugin.options.extra.js) {%>
<% for(var i = 0;i < htmlWebpackPlugin.options.extra.js.length;i++){ %>
<script src="<%= htmlWebpackPlugin.options.extra.js[i] %>"></script>
<% } %>
<% } %>
</body>
<script src="//cdn.bootcss.com/jquery/2.2.3/jquery.min.js"></script>
</html>
</div>
3.webpack.dev.config.json配置
var path = require('path');
var fs = require('fs');
var merge = require('webpack-merge');
var webpack = require('webpack');
var HtmlwebpackPlugin = require('html-webpack-plugin');
var OpenBrowserPlugin = require('open-browser-webpack-plugin');
var ROOT_PATH = path.resolve(__dirname);
var APP_PATH = path.resolve(ROOT_PATH, 'app');
var BUILD_PATH = path.resolve(ROOT_PATH, 'build');
var MODULE_PATH = path.resolve(ROOT_PATH, 'node_modules');
//取出页面文件映射
function getHtmlPluginArr() {
var data = JSON.parse(fs.readFileSync('app/entries.json', 'utf-8'));
var pageList = data.pageList;
var resultObj = {
"pluginArr": [],
"entryObj": {}
};
for (var index = 0; index < pageList.length; index++) {
var element = pageList[index];
var src = element.entry;
//通过对app.json中src的路径截取获得分发路径
var dist = (function() {
var s1 = src.split("./app/entries/")[1];
var s2 = s1.substr(0, s1.lastIndexOf("/"));
return s2;
})();
var title = element.title;
var extra = element.extra;
resultObj.entryObj[dist] = src;
//利用路径一部分来进行HtmlwebpackPlugin的chunks
resultObj.pluginArr.push(
new HtmlwebpackPlugin({
chunks: [dist], //当前页面js
title: title,
extra: extra,//包含页面额外的配置信息
template: "app/" + "template.ejs",
filename: dist + '.html',
chunksSortMode: "dependency" //按chunks的顺序对js进行引入
})
);
}
return resultObj;
}
var appJsonObj = getHtmlPluginArr();
/**通用配置 */
var commonConfig = {
entry: appJsonObj.entryObj,
module: {
loaders: [
{ test: /\.html$/, loader: "html?minimize=false" },
{ test: /\.json$/, loader: "json" },
{ test: /\.scss|\.css$/, loaders: ["style", "css", "sass"] },
{ test: /\.(?:jpg|gif|png)$/, loader: 'url?limit=10240&name=../images/[name]-[hash:10].[ext]' },
{ test: /\.handlebars/, loader: "handlebars" },
{ test: /\.js$/, exclude: /(node_modules|bower_components)/, loader: 'babel', query: { presets: ['es2015','stage-3','react'] } },
{ test: /\.jsx$/, exclude: /(node_modules|bower_components)/, loader: 'babel', query: { presets: ['react','stage-3','es2015']} }
]
},
output: {
path: BUILD_PATH,
filename: "js/[name].js"
},
externals: {
"jquery": "jQuery"
},
//配置短路径引用
resolve: {
alias: {
module: path.resolve(APP_PATH, 'module'),
service: path.resolve(APP_PATH, "services"),
component: path.resolve(APP_PATH, "components"),
entries: path.resolve(APP_PATH, "entries"),
routes: path.resolve(APP_PATH, "routes"),
node_modules: path.resolve(ROOT_PATH, 'node_modules')
},
extensions: ['', '.js', '.jsx']
},
plugins: appJsonObj.pluginArr,
devtool: "cheap-source-map",
cache: true
}
//webpack-dev-server 提供的是内存级别的server,不会生成build的文件夹
//访问路径直接参照build下的路径 如http://127.0.0.1:8080/shop/updateShop.html
module.exports = merge(commonConfig, {
devServer: {
hot: true,
inline: true,
progress: true,
host: process.env.HOST,
port: "8808",
proxy: {
'/api/getLeftBar': {
target: 'http://127.0.0.1:8808/mock',//dev
secure: false
},
'/api/getIndexData': {
target: 'http://127.0.0.1:8808/mock',//dev
secure: false
},
'/api/getblogs': {
target: 'http://127.0.0.1:8808/mock',//dev
secure: false
},
'/panda/*': {
target: 'http://10.4.233.139:8411/',//dev
secure: false
},
//转发至本地mock
'/page3/*':