Prefetched data is fetched and processed on initialization. If the browser supports localStorage, the processed data will be cached there to prevent additional network requests on subsequent page loads.
A function that transforms the response body into an array of datums.
The time (in milliseconds) the prefetched data should be cached in localStorage. Defaults to 86400000 (1 day).
A URL to a JSON file containing an array of datums. Required.