import { Options } from '../internal/resolveValue.ts';
import { Observer } from '../Observer/Observer.ts';
/**
 * In-memory state management. Data lives only for the current page lifecycle.
 *
 * Unlike LocalState/SessionState, values are stored by reference — there is no
 * JSON roundtrip. This means Date/Map/Set/class-instances survive a get/set
 * cycle intact (which is usually what you want), but it also means stored
 * objects are NOT defensively copied.
 */
export declare class MemoryState extends Observer {
    private static storage;
    static get<T = unknown>(key: string, options: Options<T> & {
        strict: true;
    }): T;
    static get<T = unknown>(key: string, options: Options<T> & {
        fallback: T;
    }): T;
    static get<T = unknown>(key: string, options?: Options<T>): T | undefined;
    static set<T = unknown>(key: string, value: T): void;
    static remove(key: string): void;
    static clear(): void;
    static has(key: string): boolean;
}