Way of deleting value from localStorage (not just resetting)

[MarcusCaspeco]

Hey, thanks for the great library.

There's one thing I couldn't figure out how to do:

If a store's value is set to undefined or null, I want to delete it from localstorage (localStorage.removeItem(key)), which is different from setting the value to undefined or null.

I was originally trying to accomplish this with the beforeWrite function, but since that doesn't allow me to stop the write to localStorage, it doesn't work.

My proposal is a .delete()-function that would behave just like the .reset()-function except it resets the value to default AND removes the item from localstorage. Alternatively it could be called something like .hardReset() or even be a parameter in the .reset()-function. As a consumer, I would use this function instead of setting the value to undefined if I actually want to remove it from localStorage as well.

Alternatively, let me cancel beforeWrite, as was discussed in #250 (comment). This would be a bit nicer for me as a consumer, as I could handle this logic generally and not have to worry about the difference of setting a value to undefined vs invoking .delete(), but I imagine this is more error-prone and complex to implement.

Or is there a way to accomplish this already?

Related issue: #217

[joshnuss]

Thanks @MarcusCaspeco,

This has come up before.

I think we just need to find a good API.

The challenge with a .delete() function is, what happens if the store changes after the deletion.

It's also tricky when there are multiple tabs open, since one tab can request deletion, but the other tab is still able to write.

If anyone has suggestions, I am all ears.