Return data from mutate

Now that mutate support passing an async function to get the data it will be helpful to get that data as return value of mutate.

const data = await mutate('/api/data', fetch('/api/data').then(res => res.json()))
// use data

This way if I want to use the data right now for something else I don’t need to use the old way of first fetch and await and then pass the data to mutate and return it below.

const data = await fetch('/api/data').then(res => res.json());
mutate('/api/data', data)
// use data

[BrunoQuaresma]

I think would be nice to have this interface as well:

mutate(key, data => { ...data, [newId]: newData })

[sergiodxa]

Yeah, you should be able to mutate any key used in your app even if you don’t have the current data in the scope of your mutate call.