import type { MaybePromise } from "../functional/maybe_promise";
declare const $store: unique symbol;
/**
 * Store — globally visible reactive data.
 *
 * Create a store:
 *   const ThemeStore = store.new("light");
 *
 * Set from anywhere:
 *   ThemeStore.set("dark"); // updates all subscribers
 *
 * Read from a view:
 *   const myView = view(({ use }) => {
 *     const theme = use(ThemeStore); // re-renders on change
 *     return {
 *       render() {
 *         div(() => text(`Current theme: ${theme.get()}`));
 *       }
 *     };
 *   });
 */
export declare class Store<T> {
    #private;
    readonly [$store] = true;
    constructor(initial: T);
    get(): T;
    set(value: T): void;
    update(fn: (current: T) => MaybePromise<T>): void;
    subscribe(cb: () => void): () => void;
}
export declare function isStore(value: unknown): value is Store<unknown>;
export declare const store: {
    "new"<T>(initial: T): Store<T>;
};
export {};