Error LocalAuthentication

Expo SDK
1

I used LocalAuthentication I a bared React-Native project:

“react-native”: “0.61.5”,
“expo-local-authentication”: “^8.0.0”,
“react-native-unimodules”: “^0.8.1”,

undefined is not an object (evaluating ‘_ExpoLocalAuthentication.default.authenticateAsync’)

Any help pls?

2

make sure you run pod install in the ios directory and rebuild the project

3

Thank, the error persist with all methods:

e [TypeError: undefined is not an object (evaluatin’_ExpoLocalAuthentication.default.authenticateAsync’)

Just get log with AuthenticationType

{“1”: “FINGERPRINT”, “2”: “FACIAL_RECOGNITION”, “FACIAL_RECOGNITION”: 2, “FINGERPRINT”: 1}

4

my guess is that you are writing:

import LocalAuthentication from 'expo-local-authentication';

rather than

import * as LocalAuthentication from 'expo-local-authentication';

see docs https://docs.expo.io/versions/v36.0.0/sdk/local-authentication/

5

here’s a minimal working example. just tried it in a bare project with react-native-unimodules and expo-local-authentication and it worked as expected

import * as React from "react";
import { Button, StyleSheet, View } from "react-native";
import * as LocalAuthentication from "expo-local-authentication";

export default function App() {
  return (
    <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center'}}>
      <Button
        title="Try it"
        onPress={async () => {
          let results = await LocalAuthentication.authenticateAsync();
          if (results.success) {
            alert("success!");
          } else {
            alert("fail");
          }
        }}
      />
    </View>
  );
}
6

thank you very much it was finally an error of mine where I did not correctly configure AppDelegate.h inside the iOS directory.

8

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