/**
 * ETag generation utilities
 */
/**
 * Generate ETag from file stats
 * Uses weak ETag format: W/"size-mtime"
 */
export declare function generateETag(stat: {
    size: number;
    mtime: Date;
}): string;
/**
 * Generate strong ETag from content
 * Uses hash of content
 */
export declare function generateStrongETag(content: Uint8Array): Promise<string>;
/**
 * Check if ETag matches
 */
export declare function matchesETag(etag: string, ifNoneMatch: string | null): boolean;