import { NostrEvent, UnsignedEvent } from 'nostr-tools';
/**
 * Ensures window.nostr.js is loaded.
 * Injects the script tag on first call; subsequent calls return immediately.
 * Resolves immediately without touching the DOM when running outside a browser.
 *
 * @returns Promise that resolves when window.nostr.js is loaded (or immediately in SSR)
 */
export declare function ensureInitialized(): Promise<void>;
/**
 * Check if window.nostr is available
 * @returns boolean indicating if window.nostr is available
 */
export declare function isAvailable(): boolean;
/**
 * Get the public key from window.nostr
 * @returns Promise resolving to public key or null
 */
export declare function getPublicKey(): Promise<string | null>;
/**
 * Sign an event using window.nostr
 * @param event - The event to sign
 * @returns Promise resolving to signed event
 */
export declare function signEvent(event: UnsignedEvent): Promise<NostrEvent>;