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Prepare compressed versions of assets to serve them with Content-Encoding

compression plugin for webpack

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


  • asset: The target asset name. [file] is replaced with the original asset. [path] is replaced with the path of the original asset and [query] with the query. Defaults to "[path].gz[query]".
  • algorithm: Can be a function(buf, callback) or a string. For a string the algorithm is taken from zlib (or zopfli for zopfli). Defaults to "gzip".
  • test: 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.

Option Arguments for Zopfli (see node-zopfli doc for details):

  • verbose: Default: false,
  • verbose_more: Default: false,
  • numiterations: Default: 15,
  • blocksplitting: Default: true,
  • blocksplittinglast: Default: false,
  • blocksplittingmax: Default: 15