title: extjs 6.0 sencha cmd to compile only my javascript code
body: <p>I use sencha extjs 6.0 ,and it always compile all extjs  code to single one file .What I need is that :
  1 the need extjs is compiled to one single file ,I know which packages are needed ,so it can be static and not need to change .
  2 then sencha cmd compile my own javascript file to one single file ,so I can update to web server and let client  download it less size file .Because the extjs file size is large than 600K with compression .
  Anyone have idea how to do it?</p>