extract text plugin for webpack

Usage example with css

`` javascript
var ExtractTextPlugin = require("extract-text-webpack-plugin");
module.exports = {
module: {
loaders: [
{ test: /\.css$/, loader: ExtractTextPlugin.extract("style-loader", "css-loader") }
]
},
plugins: [
new ExtractTextPlugin("styles.css")
]
}
`

It moves every require("style.css") in entry chunks into a separate css output file. So your styles are no longer inlined into the javascript, but separate in a css bundle file (styles.css). If your total stylesheet volume is big, it will be faster because the stylesheet bundle is loaded in parallel to the javascript bundle.

Advantages:

* Fewer style tags (older IE has a limit)
* CSS SourceMap (with devtool: "source-map" and css-loader?sourceMap)
* CSS requested in parallel
* CSS cached separate
* Faster runtime (less code and DOM operations)

Caveats:

* Additional HTTP request
* Longer compilation time
* More complex configuration
* No runtime public path modification
* No Hot Module Replacement

API

` javascript
new ExtractTextPlugin([id: string], filename: string, [options])
`

* id Unique ident for this plugin instance. (For advanded usage only, by default automatic generated)
* filename the filename of the result file. May contain [name], [id] and [contenthash].
* [name] the name of the chunk
* [id] the number of the chunk
* [contenthash] a hash of the content of the extracted file
* options
* allChunks extract from all additional chunks too (by default it extracts only from the initial chunk(s))
* disable disables the plugin

The ExtractTextPlugin generates an output file per entry, so you must use [name], [id] or [contenthash] when using multiple entries.

` javascript
ExtractTextPlugin.extract([notExtractLoader], loader, [options])
`

Creates an extracting loader from an existing loader.

* notExtractLoader (optional) the loader(s) that should be used when the css is not extracted (i.e. in an additional chunk when allChunks: false)
* loader the loader(s) that should be used for converting the resource to a css exporting module.
* options
* publicPath override the publicPath setting for this loader.

There is also an extract function on the instance. You should use this if you have more than one ExtractTextPlugin.

`javascript
let ExtractTextPlugin = require('extract-text-webpack-plugin');

// multiple extract instances
let extractCSS = new ExtractTextPlugin('stylesheets/[name].css');
let extractLESS = new ExtractTextPlugin('stylesheets/[name].less');

module.exports = {
...
module: {
loaders: [
{test: /\.scss$/i, loader: extractCSS.extract(['css','sass'])},
{test: /\.less$/i, loader: extractLESS.extract(['css','less'])},
...
]
},
plugins: [
extractCSS,
extractLESS
]
};
``

License

MIT (http://www.opensource.org/licenses/mit-license.php)