交易后检测到无法访问的代码

Question

我在打字稿文件中收到警告“检测到无法访问的代码”。运行 Firebase 事务后没有任何效果。这是交易代码：

// Create Firestore reference
let pointsRef = 'Users/'+this.user.uid;
var pointsDocRef = this.afs.doc(pointsRef).ref;

return this.afs.firestore.runTransaction((transaction) => {
  return transaction.get(pointsDocRef).then((ptsDoc) => {
    if(!ptsDoc.exists){
      throw "Document does not exist!"
    }

    var newPtsScore = ptsDoc.data().points - 20;
    transaction.update(pointsDocRef, { points: newPtsScore });             
  });
}).then(() => {
  console.log('Point count successfully decremented for new item'); 
  // Close dialog
  this.dialog.closeAll();
}).catch(function(error) {console.log('Transaction failed: ', error);});

console.log('Hey there!'); <-- "UNREACHABLE CODE DETECTED"

Answer 1

您的日志行紧跟在return 语句之后。它永远不会运行，因为return 离开了函数。