code: def minify_js_files():
      
      for k, v in JS_FILE_MAPPING.items():
          input_files = " ".join(v["input_files"])
          output_file = v["output_file"]
  
          uglifyjs_command = "uglifyjs {input_files} -o {output_file}".format(
              input_files=input_files,
              output_file=output_file
          )
          local(uglifyjs_command)
docs: This command minified js files with UglifyJS