/**
 * useFile Hook
 *
 * Hook for file metadata operations (read-only).
 * Provides fetchById, getSignedUrl, and exists methods.
 *
 * @returns {CoreFileResult} Object containing:
 * - `fetchById` - Fetch file metadata by ID
 * - `getSignedUrl` - Get signed URL for a file
 * - `exists` - Check if a file exists
 *
 * @example Basic usage
 * ```typescript
 * const { fetchById, getSignedUrl, exists } = useFile();
 *
 * const metadata = await fetchById('file-123');
 * const { url, expiresAt } = await getSignedUrl('file-123');
 * const fileExists = await exists('file-123');
 * ```
 */
import { type CoreFileResult } from '@plyaz/types/core';
/**
 * Hook for file metadata operations.
 * @returns Metadata functions
 */
export declare function useFile(): CoreFileResult;
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