Ability to turn off tab synchronization

[shishkin17]

Hello,

It turns out that if I don't what tab synchronization, I need to create the whole storage object (without subscription) even though I am ok with the built in implementation.
It would be great to have an option just not to subscribe.

Thanks!

[dai-shi]

With v2.8.2, we can customize subscribe, so a workaround is to provide a noop subscribe.
#2539

import { createJSONStorage, atomWithStorage } from 'jotai/utils';

const myStorage = createJSONStorage(() => ({ ...localStorage, subscribe: () => () => {} }));
const myAtom = atomWithStorage('foo', 'foo', myStorage);

[shishkin17]

Thank you for suggestion, but unfortunately this is not working. Destructuring localStorage doesn't copy getItem() and it fails.
I tried to make a copy of localStorage with Object.assign(), it didn't fail, but subscribe was added as a field to storage so it didn't work.

Solution that finally worked for me is:

const myStorage = createJSONStorage();
myStorage.subscribe = undefined;
const myAtom = atomWithStorage('foo', 'foo', myStorage);

I suggest adding this to docs on how not to subscribe, because it is not obvious at the beginning.

[dai-shi]

myStorage.subscribe = undefined; oh, that's much easier!!!
Yes, please open a PR to improve the docs.

[shishkin17]

I ran into weird problems because of that, so I suggest not to remove subscription.