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Wrong type for DraftFunction? #135

@musjj

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@musjj

export type DraftFunction<S> = (draft: Draft<S>) => void;

It currently specifies void as the return type, but you can actually return a new object, like:

const [state, updateState] = useImmer({ some: "value" });
updateState(() => ({ new: "value" }));

From my observations, it's equivalent to:

updateState({ new: "value" });

I was trying to make a wrapper for the updater function and the wrong function signature tripped me up.

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