Add support for specifying Storage

[Nikola-Milovic]

It would be a nice option to be able to specify the storage type as long as it adheres to the Storage interface

for example, it would allow us to integrate expo-secure-store

import SuperTokens from 'supertokens-react-native';
import * as SecureStore from "expo-secure-store";
import "react-native-url-polyfill/auto";

const ExpoSecureStoreAdapter = {
	getItem: (key: string) => {
		return SecureStore.getItemAsync(key);
	},
	setItem: (key: string, value: string) => {
		SecureStore.setItemAsync(key, value);
	},
	removeItem: (key: string) => {
		SecureStore.deleteItemAsync(key);
	},
};

SuperTokens.init({
	apiDomain: "<YOUR_API_DOMAIN>",
	apiBasePath: "/auth",
	storage: ExpoSecureStoreAdapter
});

From the GoTrue JS SDK , this is the type they allow as storage

https://github.com/supabase/gotrue-js/blob/master/src/lib/types.ts#L48
https://github.com/supabase/gotrue-js/blob/master/src/lib/types.ts#L929

This would be a nice to have, it would possibly allow merging the supertokens libraries into a single supertokens-js library instead of having multiple implementations for RN and Web separately. Thoughts?

[rishabhpoddar]

These are excellent changes. We will consider these when we have more bandwidth. That being said, feel free to open a PR in our existing react native SDK to add this feature.

[iway1]

this would be cool.. react-native-mmkv would be a great option as it is the fastest persistence library and is fully synchronous. Maybe that allows making some of the async methods in the library synchronous?