2-9多种配置类型

2-9/README.md

+### webpack 4引入了生产和开发模式
+
+一个典型的项目可能有：
+
+* 一个用于开发的配置文件，用于定义webpack dev服务器和其他东西
+* 用于生产的配置文件，用于定义UglifyJSPlugin和sourcemaps等
+* 虽然更大的项目可能仍然需要2个文件，但是在webpack 4中，可以无需任何配置。
+
+```javascript
+"scripts": {
+    "build": "npx webpack --mode production",
+    "dev": "npx webpack --mode development"
+},
+```
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2-9/main.js

+console.log('test')
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2-9/package.json

+{
+  "name": "2-9",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "build": "npx webpack --mode production",
+    "dev": "npx webpack --mode development"
+  },
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "webpack": "^4.12.0",
+    "webpack-cli": "^3.0.3"
+  }
+}

2-9/webpack.config.js

+const path = require('path');
+
+module.exports = function(){
+    return {
+        entry:'./main.js',
+        output:{
+            filename:'./bundle.js',
+            path:path.resolve(__dirname,'./dist')
+        }
+    }
+}
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