code: def watch(self):
      os.chdir(self.main)
      os.system("npm run build:dev")
  
imports: import os
  import sys
  import json
  import string
  import shutil
  import logging
  import coloredlogs
  import fire
  import requests
  from .._utils import run_command_with_process, compute_md5, job
label_desc: Use image node_id 7 for calling the BuildProcess obj's underlying member method code with example usage: obj.watch() without return types