/**
 * Nexus graph export — business logic extracted from `cleo nexus export`.
 *
 * Queries nexus.db for nodes and relations and serializes them to GEXF or
 * JSON. The CLI handler calls {@link exportNexusGraph} and routes output to
 * stdout or a file.
 *
 * @module nexus/export
 * @epic T9833
 * @task T10062
 */
/** Output format for the graph export. */
export type NexusExportFormat = 'gexf' | 'json';
/** Options for {@link exportNexusGraph}. */
export interface NexusExportOptions {
    /** Serialization format (default: `'gexf'`). */
    format?: NexusExportFormat;
    /** When set, only nodes/relations belonging to this project are exported. */
    projectFilter?: string;
}
/** Result of {@link exportNexusGraph}. */
export interface NexusExportResult {
    /** Serialized graph content (GEXF XML or JSON string). */
    content: string;
    /** Number of nodes included in the export. */
    nodeCount: number;
    /** Number of edges included in the export. */
    edgeCount: number;
}
/**
 * Export the nexus graph as GEXF or JSON.
 *
 * Queries `nexus.db` for all nodes and relations, applies an optional project
 * filter, and serializes to the requested format.
 *
 * @param opts - Export options
 * @returns Serialized content and counts
 * @throws {Error} On unknown format or database errors
 */
export declare function exportNexusGraph(opts?: NexusExportOptions): Promise<NexusExportResult>;
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