“预期分配或 function 调用，而是在我的聊天应用程序中看到一个表达式 no-unused-expressions”

Question

I am working on a React Chat app and during accessing my firebase I got this error "Expected an assignment or function call and instead saw an expression no-unused-expressions"

The error occurs in the assignment to this.removeListener.

The following are the lines of code in which I got the error:

this.removeListener = firebase.firestore()
    .collection('Messages')
    .doc(this.groupChatId)
    .collection(this.groupChatId)
    .onSnapshot(Snapshot => {
      Snapshot.docChanges().forEach(change=>{
        if(change.type === LoginString.DOC) {
          this.listMessage.push(change.doc.data());
        }
    })
})

Please help!

Answer 1

I solved the problem by enclosing the entire expression to the right of the "=" in parentheses ie from before "firebase" to the last line after "})". I think that actually helped in evaluating the expression first and then make the assignment.

Please let me know if it works for any of you also. Thank You!