@tinijs/store/dist/lib/main.js

The state management module for the TiniJS framework.

export function createStore(states, options = {}) {
    const store = new Proxy(states, {
        get(target, prop) {
            if (prop === 'subscribe') {
                return (stateKey, callback) => {
                    if (stateKey in target) {
                        // subscribe
                        const subscriptions = (target[`___${stateKey}$`] ||= new Map());
                        const subscriptionId = Symbol();
                        subscriptions.set(subscriptionId, callback);
                        // unsubscribe
                        return () => subscriptions.delete(subscriptionId);
                    }
                    else {
                        throw new Error(`Unknown state: ${stateKey}`);
                    }
                };
            }
            else if (prop === 'commit') {
                return (stateKey, value) => (store[stateKey] = value);
            }
            else {
                return target[prop];
            }
        },
        set(target, prop, value) {
            const subscriptions = target[`___${prop}$`];
            // set value
            const currentValue = target[prop];
            const oldValue = !options.preserveOldValue
                ? currentValue
                : !(currentValue instanceof Object)
                    ? currentValue
                    : structuredClone(currentValue);
            target[prop] = value;
            // notify subscribers
            subscriptions?.forEach(callback => callback(value, oldValue));
            // success
            return true;
        },
    });
    return store;
}
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