/**
 * Handles communication with the extension via window.postMessage
 */
import type { HelperMessage } from './types';
/**
 * Send a message to the extension via window.postMessage
 */
export declare function postMessageToExtension(message: HelperMessage, debug?: boolean): void;
/**
 * Check if the extension is available by looking for a specific marker
 * Note: This is a best-effort check and may not be 100% accurate
 */
export declare function isExtensionAvailable(): boolean;
/**
 * Wait for the extension to become available (with timeout)
 */
export declare function waitForExtension(timeoutMs?: number): Promise<boolean>;
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