TypeError: This'VARIABLE_NAME' is not a function

Question

I wanna define to null. Why won't it let me do this? I'm getting a TypeError error. I think there was no such problem with older versions?I want to treat this variable like typescript?

unsubscribe: null ;

componentDidMount() {          
    const user = this.props.uid || Fire.shared.uid;

    this.unsubscribe = Fire.shared.firestore
        .collection("users")
        .doc(user)
        .onSnapshot(doc => {
            this.setState({ user: doc.data() });
        })

}

componentWillUnMount() {   // EDITED
    this.unsubscribe();
}

Adam Jenkins · Accepted Answer · 2020-05-31 23:21:11Z

1

componentWillMount gets called before componentDidMount - this is a typo. You meant to write unsubscribe in componentWillUnmount, not componentWillMount

answered May 31, 2020 at 23:21

Adam Jenkins

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2 Comments

cantaş Over a year ago

Yes thanks. but still I get an error on this line ( unsubscribe: null ;). did not change the situation. What can I write instead of if we can no longer make such a demonstration?

Adam Jenkins Over a year ago

@cantaş unsubscribe = null

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