foreachがサイクルから飛び出す

let success = false; //     
for (const key in msgList) {
  let newMsg = msgList[key];
  try {
    //   code
    success = true;
    newAttr.push(newMsg);
  } catch (error) {
    remote.dialog.showErrorBox('  ', '    ');
    success = false;
    return false;
  }
}