Explanation:
The error message “invariant violation: `new nativeeventemitter()` requires a non-null argument.” is related to using the `NativeEventEmitter` class in the Hermes JavaScript engine.
The `NativeEventEmitter` is a class provided by the React Native library. It allows you to subscribe to and emit native events from native modules. However, in the Hermes JavaScript engine, there is a requirement that the constructor of `NativeEventEmitter` should be called with a non-null argument.
This means that when creating an instance of `NativeEventEmitter`, you need to pass a non-null argument to the constructor. If you fail to provide a non-null argument, you will encounter the mentioned invariant violation error.
Here is an example demonstrating the correct usage of `NativeEventEmitter`:
<script>
import { NativeEventEmitter, NativeModules } from 'react-native';
// Assuming you have a native module named "MyNativeModule" which emits events.
const myNativeModuleEmitter = new NativeEventEmitter(NativeModules.MyNativeModule);
const eventListener = myNativeModuleEmitter.addListener(
'myCustomEvent',
(event) => {
console.log('Received event:', event);
}
);
// Remember to remove the listener when no longer needed.
eventListener.remove();
</script>