export type GetValueAtPath = (resource: any, path: string) => any;
/**
 * Get extension arrays grouped by parent element instance.
 *
 * For paths like `Account.coverage.extension`, if `coverage` is an array,
 * returns one group per coverage item. Cardinality constraints apply per
 * group, not globally across the flattened array.
 */
export declare function getExtensionGroupsByParent(resource: any, elementPath: string, getValueAtPath: GetValueAtPath): any[][];
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