var CompressionPlugin = require("compression-webpack-plugin");
module.exports = {
	plugins: [
		new CompressionPlugin({
			asset: "[file].gz",
			algorithm: "gzip",
			regExp: /\.js$|\.html$/,
			threshold: 10240,
			minRatio: 0.8
		})
	]
}

Arguments:

• asset: The target asset name. [file] is replaced with the original asset. Defaults to "[file].gz".
• algorithm: Can be a function(buf, callback) or a string. For a string the algorithm is tacken from zlib. Defaults to "gzip".
• regExp: All assets matching this RegExp are processed. Defaults to every asset.
• threshold: Only assets bigger than this size are processed. In bytes. Defaults to 0.
• minRatio: Only assets that compress better that this ratio are processed. Defaults to 0.8.

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