How to use function version of refreshInterval that depends on data response?

[justin-calleja]

The refreshInterval option is defined as:

    refreshInterval?: number | ((latestData: Data | undefined) => number);

If latestData is a promise, I need to resolve it to know what interval to return (0 or not). But to resolve it means that the return value of the refreshInterval function is not a number but a Promise<number>. Is it not possible to use the function version of this option to enable / disable refetching based on latestData values?

e.g. latestData is a Promise<{ msg: string }>. I would like to return 0 to disable refetching when msg is "done" for e.g. I cannot satisfy the type system because I must resolve latestData before I can check if msg is "done".

[justin-calleja]

Looks like I defined the Data type incorrectly and should have Awaited the response of the fetcher:

useSWR<Awaited<ReturnType<typeof getProfile>> | undefined>

I confirm I can use the refreshInterval function version and return 0 based on the resolved value of getProfile which gets passed to refreshInterval function (as a resolved value).