Allow multiple file outputs one for each algorithm

[crhistianramirez]

• Operating System: Windows / Mac / Linux
• Node Version: 8.9.0
• NPM Version: 6.9.0
• webpack Version: 4.3.0
• compression-webpack-plugin Version: 3.0.0

Feature Proposal

Allow plugin to generate multiple file outputs for multiple algorithms. Maybe algorithms can take an optional array format to indicate more than one file (per algorithm) should be generated.

Feature Use Case

Since this plugin now supports brotli algorithm it would be nice to be able to output both gzip and brotli so that my server can serve up the appropriate file to the client based on the accept headers.

[alexander-akait]

PR welcome

[crhistianramirez]

Huh... just created two instances of the plugin and that seemed to do the trick. Maybe I can just create a PR to document that?

// outputs both brotli and gzip files
new CompressionPlugin({
  filename: '[path].gz[query]',
  algorithm: 'gzip',
  test: /\.js$|\.css$|\.html$/,
  threshold: 10240,
  minRatio: 0.8,
}),
new CompressionPlugin({
  filename: '[path].br[query]',
  algorithm: 'brotliCompress',
  test: /\.(js|css|html|svg)$/,
  compressionOptions: { level: 11 },
  threshold: 10240,
  minRatio: 0.8,
})

[alexander-akait]

@crhistianramirez it is workaround, maybe it is good idea support algorithm as array for better DX

[alexander-akait]

After investigate i found what using multiple instances is better then using array of algorithms because each algorithm potential can have difference options and it is increase plugin configurations and logic in code, just put this example in docs

[CyberCookie]

I wouldn't close this issue since having one instance per one algorithm have it's drawback:
If i want to use more than one algorithm and use option "deleteOriginalAssets: true" (no matter which instance i set this option in) - as a result i will get only one compressed format instead of all i specified