This is a TypeScript decorator function that can be used to store data in the browser's local storage. It provides a simple way to sync data between a class property and the local storage without having to manually manage the data persistence.
To use this decorator, you need to pass a key string to it. This key will be used to identify the data in the local storage. Then, you can apply the decorator to a class property like this:
class MyClass {
@LocalStorage("key")
data: any;
}