function
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);
© 2010–2020 Google, Inc.
Licensed under the Creative Commons Attribution License 4.0.
https://v10.angular.io/api/platform-browser/makeStateKey