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import { n as noop, s as safe_not_equal } from './index-2620635a.js';

const subscriber_queue = [];
/**
 * Create a `Writable` store that allows both updating and reading by subscription.
 * @param {*=}value initial value
 * @param {StartStopNotifier=}start start and stop notifications for subscriptions
 */
function writable(value, start = noop) {
    let stop;
    const subscribers = new Set();
    function set(new_value) {
        if (safe_not_equal(value, new_value)) {
            value = new_value;
            if (stop) { // store is ready
                const run_queue = !subscriber_queue.length;
                for (const subscriber of subscribers) {
                    subscriber[1]();
                    subscriber_queue.push(subscriber, value);
                }
                if (run_queue) {
                    for (let i = 0; i < subscriber_queue.length; i += 2) {
                        subscriber_queue[i][0](subscriber_queue[i + 1]);
                    }
                    subscriber_queue.length = 0;
                }
            }
        }
    }
    function update(fn) {
        set(fn(value));
    }
    function subscribe(run, invalidate = noop) {
        const subscriber = [run, invalidate];
        subscribers.add(subscriber);
        if (subscribers.size === 1) {
            stop = start(set) || noop;
        }
        run(value);
        return () => {
            subscribers.delete(subscriber);
            if (subscribers.size === 0) {
                stop();
                stop = null;
            }
        };
    }
    return { set, update, subscribe };
}

export { writable as w };