import type { PersistencePort } from './persistence.js';
import type { RelayPort } from './relay.js';
export interface NativeStorage {
    getItem(key: string): Promise<string | null>;
    setItem(key: string, value: string): Promise<void>;
    removeItem(key: string): Promise<void>;
}
export declare function nativePersistence(storage: NativeStorage): PersistencePort;
export interface MessageEndpoint {
    postMessage(message: unknown): void;
    addEventListener(type: 'message', listener: (event: MessageEvent) => void): void;
    removeEventListener(type: 'message', listener: (event: MessageEvent) => void): void;
    start?(): void;
    close?(): void;
}
export declare function messageRelay<State>(endpoint: MessageEndpoint): RelayPort<State>;
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