@forest-js/core/dist/store/core.js

A tiny, functional DOM engine with explicit update and real DOM.

/**
 * @function createStore
 * @description Create a store
 * @param initial - Initial value
 * @returns Store
 * @example
 * ```ts
 * const store = createStore(0);
 * ```
 */
export function createStore(initial) {
    let value = initial;
    const subscribers = new Set();
    return {
        get: () => value,
        set: (next) => {
            value = next;
            subscribers.forEach((fn) => fn());
        },
        update: (fn) => {
            value = fn(value);
            subscribers.forEach((fn) => fn());
        },
        subscribe: (fn) => {
            subscribers.delete(fn);
            subscribers.add(fn);
            return () => subscribers.delete(fn);
        },
        unsubscribe: (fn) => {
            subscribers.delete(fn);
        },
    };
}
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