Add ability to clear/disable selector cache

There’s some cases where you don’t want responses to be cached, because they depend on the currently logged-in user. If the user logs out, it’s a security issue for their data to be cached. It would be good to have some way to clear the cached values on log out.

What’s the recommended way to handle this situation?

export const selector_user_first_name = selector<string>({
    key: 'user_first_name',
    get: async () => {
        return await (await fetch('/User/FirstName')).text();
    }
});

export const LogOut = () => {
    await fetch('/User/Logout', { method: 'POST' });
    clearSelector(selector_user_first_name );
}

[drarmstr]

@csantos42 is working on exactly this.

[florianbepunkt]

@drarmstr Selector cache policies do not fully address this issue. As far as I can tell from the docs, it is not possible to disable or imperatively clear a cache. We have some unit tests where cached selector data is bleeding between tests (see issue https://github.com/facebookexperimental/Recoil/issues/981)

There is no cache strategy of “none”. Also a cache strategy of { eviction: 'lru', maxSize: 0 } does not disable caching.