jotai-history/dist/withHistory.js

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import { atom } from 'jotai/vanilla';
import { RESET } from './actions.js';
/**
 * @param targetAtom an atom or derived atom
 * @param limit the maximum number of history states to keep
 * @returns an atom with an array of history states
 */
export function withHistory(targetAtom, limit) {
    const refreshAtom = atom(0);
    refreshAtom.debugPrivate = true;
    const historyAtom = {
        read: (get) => (get(refreshAtom), { history: [] }),
        write: (get, set) => {
            get(historyAtom).history.length = 0;
            set(refreshAtom, (v) => v + 1);
        },
        onMount: (reset) => reset,
        debugPrivate: true,
        init: 1, // dirty hack to bypass hasInitialValue
    };
    return atom((get) => {
        const ref = get(historyAtom);
        return (ref.history = [get(targetAtom), ...ref.history].slice(0, limit));
    }, (_, set, action) => {
        if (action === RESET) {
            set(historyAtom);
        }
    });
}
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