对webpack的配置文件吐个槽

webpack官方文档

entry

The entry point for the bundle.

If you pass a string: The string is resolved to a module which is loaded upon startup.

If you pass an array: All modules are loaded upon startup. The last one is exported.

entry: ["./entry1", "./entry2"]

If you pass an object: Multiple entry bundles are created. The key is the chunk name. The value can be a string or an array.

{

entry: {
    page1: "./page1",
    page2: ["./entry1", "./entry2"]
},
output: {
    // Make sure to use [name] or [id] in output.filename
    //  when using multiple entry points
    filename: "[name].bundle.js",
    chunkFilename: "[id].bundle.js"
}

}

文档中对entry的说明看起来是详细的，但是文档中可没说，这货还可以这么省略地写，look！

假如入口文件是`src/index.js`，那么在`webpack.config.js`中就可以这么写：

```js
// String
{
	entry: './src/index.js',
	output: {
		path: './dist',
		filename: '[name].bundle.js'
	}
}

// 或者不指定entry的文件后缀也是可以的
{
	entry: './src/index',
	output: {
		path: './dist',
		filename: '[name].bundle.js'
	}
}

除了可以省略entry的后缀，这货甚至还支持类似apache或nginx的DirectoryIndex。
也就是说可以指定默认文件，这货的默认文件就是index.js。对应的配置就可以写成下面这样了：

{
	entry: './src',
	output: {
		path: './dist',
		filename: '[name].bundle.js'
	}
}

Ps: 感慨一下，这东西灵活归灵活，但还是建议按常规写法来，清晰明了多好呀，至少看起来一目了然。