/**
 * If two definitions have the same id, they can be merged.
 */
export declare function getDefinitionID(definition: any): string;
/**
 * Merge 2 definitions.
 *
 * B overwrites A if it does not have an selection set.
 * Otherwise merge selection sets.
 */
export declare function mergeDefinitions(a: any, b: any): any;
/**
 * Merge selectionSets.
 */
export declare function mergeSelectionSets(a: any, b: any): any;