TypeError: Cannot read property 'createNotificationChannel' of undefined

[klausbreyer]

I am working with the example project from this repo. And I have a problem to access FCM.

    async componentDidMount() {
        console.log(FCM) //<-- i added this for debugging. 
        FCM.createNotificationChannel({
            id: 'default',
            name: 'Default',
            description: 'used for example',
            priority: 'high'
        })

And this is very weird. Because the console.log clearly shows that the FCM object is there. But then there is this error and execution of the componentDidMount ends.

"react": "16.4.1",
"react-native": "0.56.0",
"react-native-fcm": "^16.1.0",
"react-native-firebase": "5.0.0-rc0",

Android 8.1 Simulator

The same code is working on ios like a charm. Maybe this is linked to my other issue? https://github.com/evollu/react-native-fcm/issues/1026

[WilliamAlexander]

I've seen something like this before. I did following: rm -rf node_modules && npm install

[christianchown]

You will see this error if the native module is not compiled and linked correctly. Make sure that you have these lines

• android\settings.gradle
  • include ':react-native-fcm' and
  • project(':react-native-fcm').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-fcm/android')
• android\app\build.gradle
  • compile project(':react-native-fcm') (or implementation ....)
• android\app\src\main\java\your\package\name\MainAppliaction.java
  • import com.evollu.react.fcm.FIRMessagingPackage;
  • new FIRMessagingPackage() in the getPackages() array

As well as the necessary google links outlined in https://github.com/evollu/react-native-fcm#android-configuration

[TranHuuTrung]

If you're using RN with version < 0.6 , you need use jetifier to migrate (Now I am using RN 0.59.8) and I ran following:

npm install --save-dev jetifier
npx jetify
npx react-native run-android (your app should correctly compile and work)

That worked for me as well reference: https://github.com/mikehardy/jetifier#usage-for-source-files