/**
 * Auto-detection of graph file formats.
 *
 * Supports: JSON, GML, Pajek (.net), SNAP (.edges, .txt), UCINET (.dl)
 */
export type GraphFormat = "json" | "gml" | "pajek" | "snap" | "ucinet";
/**
 * Detect format from file extension.
 * @param filename
 */
export declare const detectFormatFromExtension: (filename: string) => GraphFormat | null;
/**
 * Detect format from file content.
 * Examines the first few lines to identify the format.
 * @param content
 */
export declare const detectFormatFromContent: (content: string) => GraphFormat | null;
/**
 * Detect format from filename and optionally content.
 * Tries extension first, then falls back to content analysis.
 * @param filename
 * @param content
 */
export declare const detectFormat: (filename: string, content?: string) => GraphFormat | null;
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