const notify = (node) => !node.isLayoutDirty && node.willUpdate(false);
function nodeGroup() {
    const nodes = new Set();
    const subscriptions = new WeakMap();
    const dirtyAll = () => nodes.forEach(notify);
    return {
        add: (node) => {
            nodes.add(node);
            subscriptions.set(node, node.addEventListener("willUpdate", dirtyAll));
        },
        remove: (node) => {
            nodes.delete(node);
            const unsubscribe = subscriptions.get(node);
            if (unsubscribe) {
                unsubscribe();
                subscriptions.delete(node);
            }
            dirtyAll();
        },
        dirty: dirtyAll,
    };
}

export { nodeGroup };