$jsCompressor public property
JavaScript file compressor. If a string, it is treated as shell command template, which should contain placeholders {from} - source file name - and {to} - output file name. Otherwise, it is treated as PHP callback, which should perform the compression. Default value relies on usage of "Closure Compiler" See also https://developers.google.com/closure/compiler/.
public string|callable $jsCompressor = 'java -jar compiler.jar --js {from} --js_output_file {to}'