/**
 * StructureDefinition Loader - Embedder-Provided Profile Source
 *
 * Forwards profile-by-URL lookups to whatever ProfileSource the embedder
 * installed via `setProfileSource()`. Default = noop (returns null), so
 * the engine works fine in standalone (CLI / npm-package) contexts where
 * no database-backed source is available.
 *
 * Historically this file lazy-imported the server's `ProfileCache`
 * directly; that coupling now lives at `persistence/index.ts` where
 * embedders inject their implementation.
 */
import type { StructureDefinition } from './structure-definition-types';
import { type ProfileSourceContext } from '../persistence';
/**
 * Look up a profile in the embedder-provided ProfileSource.
 * @param url - Profile canonical URL
 * @param dbCacheNotFound - Negative cache set
 * @param fhirVersion - FHIR version to filter by (prevents R5 defs being returned for R4 validation)
 */
export declare function checkDatabaseCache(url: string, dbCacheNotFound: Set<string>, fhirVersion?: 'R4' | 'R5' | 'R6', context?: ProfileSourceContext): Promise<StructureDefinition | null>;
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