code: def buildFromJsbString(self, jsb, nocompressjs=False):
          
          tempconffile = 'temp-app.jsb3'
          cmd = ['sencha', 'build', '-p', tempconffile, '-d', self.outdir]
          if nocompressjs:
              cmd.append('--nocompress')
          open(tempconffile, 'w').write(jsb)
          log.info('Running: %s', ' '.join(cmd))
          try:
              call(cmd)
          finally:
              remove(tempconffile)
docs: Build from the given config file using ``sencha build``.
  
          :param jsb: The JSB config as a string.
          :param nocompressjs: Compress the javascript? If ``True``, run ``sencha build --nocompress``.