message: Use a synchronous kill process
  Related to
diff: @@ -55,9 +55,9 @@ export class Builder {
  if (proc) {
  const pid = proc.pid
  if (process.platform === 'linux' || process.platform === 'darwin') {
  - cp.exec(`pkill -P ${pid}`)
  + cp.execSync(`pkill -P ${pid}`)
  } else if (process.platform === 'win32') {
  - cp.exec(`taskkill /F /T /PID ${pid}`)
  + cp.execSync(`taskkill /F /T /PID ${pid}`)
  }
  proc.kill()
  this.extension.logger.addLogMessage(`Kill the current process. PID: ${pid}.`)
  