/**
 * A counter whose count lives in the vat's storage.
 *
 * TODO: a durable Exo once vatPowers offers a zone, e.g.
 * `zone.exoClass("Counter", undefined, () => ({ count: 0 }), { incr() { this.state.count += 1; return this.state.count; } })`
 */
export const buildRootObject = ({ Far, storage }) =>
	Far("counterRoot", {
		increment: () => {
			const n = (storage.get("count") ?? 0) + 1;
			storage.put("count", n);
			return n;
		},
		read: () => storage.get("count") ?? 0,
	});