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Viewsnull is not an object (evaluating 'RCTAsyncStorage.multiMerge')
I recently upgraded to Expo SDK 43.
I am now getting this error:
The line of code throwing it is:
if (!RCTAsyncStorage.multiMerge) {
I am on the latest version of AsyncStorage.
This seems to be due to my usage of firebase-js-sdk.
Unfortunately as this is an iOS/Android/Web project, it's necessary.
When I mock my Firebase exports, everything works:
const auth = () => {};
const analytics = () => {};
export default { auth, analytics };
But when I use the firebase-js-sdk functions, I get the above message.
This code causes an error (whichever version of auth I use)
let auth = initializeAuth(config, {
persistence: getReactNativePersistence(AsyncStorage),
});
//let auth = getAuth(config);
let analytics = getAnalytics(config);
export default { auth, analytics };
1 answers
Answer question0
You could avoid that specific error by adding optional chaining (the question mark '?'):
if (!RCTAsyncStorage?.multiMerge) {
It will shortcircuit to undefined (thus making the if false) instead of throwing error from trying to check in the null object.
As to why RCTAsyncStorage would be null, you would have to check where you first get/declare it, and traceback to the point it didn't load, maybe you are using something conflicting from firebase-js-sdk.
Also multiMerge might not be supported always as mentioned in the docs:
multiMerge
[...] NOTE: This is not supported by all native implementations.