Facebook API Question posted in
The official documentation for the Facebook APIs can be found here.

Facebook login error: can't find variable: Alert

I’m trying to authenticate users using facebook. I’m able to successfully ask for permission and authorize a user on the facebook platform, but then the app returns and error on redirect and produces the following error -> Facebook Login Error: Can't find variable: Alert. Yes I have Alert syntax in my facebook login method, but I simply cannot locate where this error is being triggered.

Has anyone experienced this before? 

   facebookSignIn = async () => {
  try {
    const {
      type,
      token,
      expires,
      permissions,
      declinedPermissions,
    } = await Expo.Facebook.logInWithReadPermissionsAsync('<APP ID>', {
      permissions: ['public_profile'],
    });
    if (type === 'success') {
      // Get the user's name using Facebook's Graph API
      const response = await fetch(`https://graph.facebook.com/me?access_token=${token}`);
      Alert.alert('Logged in!', `Hi ${(await response.json()).name}!`);
      this.props.navigation.navigate('SenderHPP');
    } else {
      // type === 'cancel'
    }
  } catch ({ message }) {
    alert(`Facebook Login Error: ${message}`);
  }
};
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4

Answers


  1. 0

    Please try to add this line to the top.

    import { Alert } from 'react-native';
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  2. 0

    Did you import Alert from react-native?

    first,

    import { Alert } from 'react-native';

    You’re good to go!

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  3. 0

    You should add this

    import *as Facebook from ‘expo-facebook’;

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  4. 0

    Alert.alert is throwing this error. Replace it with “console.log” or simple alert.

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