Question

我是nodeJs的初学者，但尝试连接到云服务器以通过firebase云通知发送通知

   // The Cloud Functions for Firebase SDK to create Cloud Functions and setup triggers.
const functions = require('firebase-functions');

// The Firebase Admin SDK to access the Firebase Realtime Database.
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);

exports.helloWorld = functions.https.onRequest((request, response) => {
 response.send("Hello from the ProjectSupporter Team");
});

exports.sendPushNotifications = functions.https.onRequest((req, res) => {
    res.send("Attempting to send push notification...")
    console.log("LOGGER --- Trying to send push message...")

    // admin.message().sendToDevice()

    var uid = 'Ky6h0BgpGDNMUyyBgE4ul99MzXk1'

    return admin.database().ref('/users/' + uid).once('value', async snapshot => {
        var user = snapshot.val();
        console.log("User username: " + user.username + " fcmToken: " + user.fcmToken);

        // See documentation on defining a message payload.
        var message = {
            notification: {
                title: "Push Notification Title",
                body: "Message Body..."
            },
          data: {
            score: '850',
            time: '2:45'
          },
          token: user.fcmToken
        };

        // Send a message to the device corresponding to the provided
        // registration token.
       try {
       const response = await admin.messaging().send(message);
       console.log('Successfully sent message:', response);
   } catch(e) {
       console.log('Error sending message:', error);
   }
});

这是我收到的错误消息：

20:70错误解析错误：意外的令牌快照

✖1个问题（1个错误，0个警告）

npm ERR！代码ELIFECYCLE

npm ERR！错误1

npm ERR！函数@ lint：eslint .

npm ERR！退出状态1

npm ERR！

npm ERR！函数@ lint脚本失败。

npm ERR！这可能不是npm的问题。上面可能有额外的日志记录输出。

我的意见Brackets说第20,70行有一个错误。我无法弄清楚问题是什么。

这是一张图片： https://ibb.co/iBp17H

提前致谢！

Answer 1

您收到的错误导致eslint错误，如果您运行代码它会起作用，因为它是有效的javascript。

linter规则promise/always-return要求你总是在一个承诺链内返回，即使是在最后.then。所以只需返回一些内容或使用async/await。

return admin.database().ref('/users/' + uid).once('value', snapshot => {
    /*...*/
    // Send a message to the device corresponding to the provided
    // registration token.
    return admin.messaging().send(message)
        .then((response) => {
             //  promise/always-return
             console.log('Successfully sent message:', response);
             // Do something with response
             return true; // To quiet linter.
        })
        .catch((error) => {
            console.log('Error sending message:', error);
        });
});

使用async/await（您需要首先转换代码）

Cloud Functions for Firebase Async Await style

return admin.database().ref('/users/' + uid).once('value', async snapshot => {
    /*...*/
    // Send a message to the device corresponding to the provided
    // registration token.

    try {
        const response = await admin.messaging().send(message);
        console.log('Successfully sent message:', response);
    } catch(e) {
        console.log('Error sending message:', error);
    }
});

尝试发送云通知时，NodeJs代码显示错误

1 个答案: