Add support for Brotli

[webpack-contrib]

Add support for Brotli

[Frank3K]

Proof of concept using iltorb:

let brotliCompress = require('iltorb').compress;
...
new CompressionPlugin({
    asset: "[path].br",
    algorithm: function (buf, options, callback) {
      brotliCompress(buf, {
        mode: 0, // 0 = generic, 1 = text, 2 = font (WOFF2)
        quality: 11, // 0 - 11
        lgwin: 22, // window size
        lgblock: 0 // block size
      }, callback);
    },
    threshold: 0,
    minRatio: 1
});

[Frank3K]

There exists a JS version of the brotli compressor and decompressor: brotli.js. Would it be possible to integrate that one?

[swernerx]

For this it would be useful to have multiple outputs as well e.g. brotli + zopfli so that in one plugin step both "files" could be created for widest possible client support.

(Also another obvious requirement would be multiple parallel file processing aka workers(/threads as both algos are pretty slow)

[michael-ciniawsky]

We consider testing and documenting how to use third party algos (brotli, zopfli, guetzli, ...) with this plugin and by default ship zlib (gzip) only, mainly bc of native modules support

new CompressionPlugin({
    asset: "[path].[compression].[ext]",
    algorithm: function (buffer, options, cb) { ...third party implementation here... }
})

Also another obvious requirement would be multiple parallel file processing aka workers(/threads as both algos are pretty slow

@swernerx If you have a solution in mind send PR highly welcome and appreciated 😛

[joshwiens]

@swernerx - We were just discussing this. Some if not most of these libs have varying system & compilation requirements making adding X number of compression libs problematic at best. They are also far from tiny on disk.

We are going the other direction with all of this, node-zopfli is going to be split into it's own compression plugin. The existing compression-webpack-plugin with handle compression with gzip, those wanting to use zopfli will have a new lib with an identical API and none of the optional dependency annoyances or the ever growing list of algorithms people want to use.

[Enalmada]

I am currently using https://www.npmjs.com/package/shrink-ray-current to get br compression on everything. I like that it returns appropriate dynamic compression for the initial response and then asynchronously recompresses with max compression for subsequent requests. Still, I found this thread because I would ideally like to br compress all assets with max compression at build time. I think it would be helpful readme had an example, to quote swernerx, of multiple outputs (brotli + zopfli) so that in one plugin step both "files" could be created for widest possible client support.

[nicksrandall]

node 11.7 (should be released any day now) will have native support for brotli compression.

See nodejs/node#25537