var ExtractTextPlugin = require("extract-text-webpack-plugin");
module.exports = {
module: {
loaders: [
{ test: /\.css$/, loader: ExtractTextPlugin.extract({
fallbackLoader: "style-loader",
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"
andcss-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
new ExtractTextPlugin(options: filename | object)
options.filename: string
(required) 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: boolean
extract from all additional chunks too (by default it extracts only from the initial chunk(s))options.disable: boolean
disables the pluginoptions.id: string
Unique ident for this plugin instance. (For advanced usage only, by default automatically generated)
The ExtractTextPlugin
generates an output file per entry, so you must use [name]
, [id]
or [contenthash]
when using multiple entries.
ExtractTextPlugin.extract(options: loader | object)
Creates an extracting loader from an existing loader. Supports loaders of type { loader: string; query: object }
.
options.loader: string | object | loader[]
(required) the loader(s) that should be used for converting the resource to a css exporting moduleoptions.fallbackLoader: string | object | loader[]
the loader(s) that should be used when the css is not extracted (i.e. in an additional chunk whenallChunks: false
)options.publicPath: string
override thepublicPath
setting for this loader
There is also an extract
function on the instance. You should use this if you have more than one ExtractTextPlugin
.
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
]
};