ESLint 错误尝试部署函数 Firebase

ESLint error trying to deploy functions Firebase

我尝试部署 fireabase 示例,但是当我尝试部署它时,CLI 启动错误:

[代码]

const functions = require('firebase-functions'); //to activate firebase functions

const admin = require('firebase-admin'); //to active firebase database permissions

admin.initializeApp(functions.config().firebase);

exports.addMessage = functions.https.onRequest((req, res) => {
// [END addMessageTrigger]
  // Grab the text parameter.
  const original = req.query.text;
  // [START adminSdkPush]
  // Push the new message into the Realtime Database using the Firebase Admin SDK.
  admin.database().ref('/messages').push({original: original}).then(snapshot => {
    // Redirect with 303 SEE OTHER to the URL of the pushed object in the Firebase console.
    res.redirect(303, snapshot.ref);
  });
  // [END adminSdkPush]
});

[错误]

  15:3   error  Expected catch() or return                  promise/catch-or-return
  15:69  error  Each then() should return a value or throw  promise/always-return

✖ 2 problems (2 errors, 0 warnings)


npm ERR! Darwin 17.4.0
npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "--prefix" "/Users/user/test/functions" "run" "lint"
npm ERR! node v6.10.2
npm ERR! npm  v3.10.10
npm ERR! code ELIFECYCLE
npm ERR! functions@ lint: `eslint .`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the functions@ lint script 'eslint .'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the functions package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     eslint .
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs functions
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls functions
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     /Users/eliassebastian/Developer/npm-debug.log

Error: functions predeploy error: Command terminated with non-zero exit code1

我看看firebase提供的原版final here

我是 Javascript 和这个世界的新手,所以我真的迷失了这类消息。

我该如何解决这个问题?

ESLint 警告是合法的。要获得关于每一个的更多详细信息,您可以使用它们的唯一 ID 进行搜索。例如:

15:3   error  Expected catch() or return                  promise/catch-or-return

这里的警告id是promise/catch-or-return。谷歌搜索 "eslint promise/catch-or-return" 发现 a plugin for ESLint 将警告描述为:

Enforces the use of catch() on un-returned promises

你得到这个是因为你有一个从 then 编辑的承诺,但你永远不会 returncatch 可能的错误。

第二次警告:

15:69  error  Each then() should return a value or throw  promise/always-return

来自同一个 ESLint 插件,描述如下:

Return inside each then() to create readable and reusable Promise chains.

它要求您 return 在每个由 then 调用的函数中设置一个值,即使您没有任何特殊的东西要发送到下一个承诺链。

您可以像这样解决这两个问题:

admin.database().ref('/messages').push({original: original}).then(snapshot => {
    res.redirect(303, snapshot.ref);
    return null;
}).catch(error => {
    console.error(error);
    res.error(500);
});

请注意,then 块 return 现在为空,并且 catch 用于承诺 return 从 then 捕获错误和向客户端发送错误响应。

Doug Stevenson 答案部分正确,但有一处瑕疵。

应该是:

admin.database().ref('/messages').push({original: original}).then(snapshot => {
    res.redirect(303, snapshot.ref);
    return 1; // IT SHOULD RETURN NON-NULL VALUE
}).catch(error => {
    console.error(error);
    res.error(500);
});

云函数在返回 null 时进入 无限循环。结果,我们可以在上图中看到函数在 60,000 毫秒后超时。

在这样的多个函数超时后,你会得到错误functions can be executed(如上图所示)。这是因为在 Spark 计划(免费套餐)中,CPUMilliSecondsDailyNonbillable 有限制。

如果你点击云功能部分的Stackdriver's Quota Policy,你可以看到GCD中的限制(Google云平台)