/**
 * Retrieves composition connections between two concepts.
 * Fetches connections linking two concepts filtered by a main key.
 *
 * @param ofConceptId - Source concept ID
 * @param toConcept - Target concept ID
 * @param mainKey - Main key to filter connections
 * @returns Array of Connection objects between the two concepts
 *
 * @example
 * const connections = await GetCompositionConnectionsBetweenTwoConcepts(123, 456, 789);
 */
export declare function GetCompositionConnectionsBetweenTwoConcepts(ofConceptId: number, toConcept: number, mainKey: number): Promise<any>;