Create a StateKey<T> that can be used to store value of type T with TransferState.
API
function makeStateKey<T = void>(key: string): StateKey<T>;
Description
Create a StateKey<T> that can be used to store value of type T with TransferState.
Example:
const COUNTER_KEY = makeStateKey<number>('counter');
let value = 10;
transferState.set(COUNTER_KEY, value);