Is it a good idea to create a weakmap atom?

[codenoobforreal]

I'm building a simple canvas application with jotai.
I am new to Jotai.
and i want to add a cache to it. so i come up with this code below

const elementWithCanvasCacheAtom = atom(
	new WeakMap<IElement, IElementWithCanvas>(),
);

// export const getElementCanvasFromCacheAtom = atom((get) =>
// 	get(elementWithCanvasCacheAtom).get(),
// );

export function getElementCanvasFromCache(element: IElement) {
	return atom((get) => get(elementWithCanvasCacheAtom).get(element));
}

I don't know if it's recommended, I just went through the documents quickly.

[dmaskasky]

If you want to have separate weakmaps per store, you should do:

atom(() => new WeakMap())

This notation will ensure that the weakmap isn't the same across all stores.

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I'm not sure of the benefit of putting a weakmap in an atom (unless you want unique weakmaps for each store). Since the reference to the weakmap never changes, you don't really need reactivity. A global weakmap should be sufficient.

[codenoobforreal]

Thanks for your quick reply.