/**
 * Recursive unknown-property walker for `detectUnknownElements`.
 *
 * The structural executor has long emitted `structural-unknown-element`
 * for top-level resource keys that aren't in the SD snapshot. Real-world
 * typos almost always sit deeper (Patient.contact[0].relationshp,
 * Bundle.entry[0].requst, …), so this walker descends through the
 * snapshot's BackboneElement paths and flags unknown keys at any depth.
 *
 * Phase 2 (this revision): also loads complex datatype SDs on demand
 * (HumanName, Address, CodeableConcept, ContactPoint, …) so typos
 * inside those types — `name[0].familly` — are caught too.
 *
 * Scope:
 *   - Walks BackboneElement children directly enumerated in the
 *     snapshot.
 *   - Walks complex-datatype children by loading the type's SD via
 *     `SDLoader` and building a sub-index. Sub-indices are cached per
 *     type code so multiple resources sharing HumanName don't pay the
 *     load cost twice in the same validation run.
 *   - Skips primitive types (string, code, uri, …) and Resource /
 *     DomainResource children. Resources nested inside Bundles or
 *     `contained[]` are validated independently by the engine
 *     recursion against their own resourceType's SD.
 *   - Choice-type properties expand `value[x]` to the concrete suffixed
 *     form (`valueString`, `valueQuantity`, …).
 */
import type { ValidationIssue } from '../../types';
import type { StructureDefinition } from '../structure-definition-types';
import type { StructureDefinitionLoader } from '../structure-definition-loader';
interface PathInfo {
    type?: string;
}
export interface SnapshotIndex {
    knownPaths: Set<string>;
    byPath: Map<string, PathInfo>;
}
export interface WalkerDeps {
    sdLoader: StructureDefinitionLoader;
    fhirVersion: 'R4' | 'R5' | 'R6';
    typeIndexCache: Map<string, SnapshotIndex | null>;
}
export declare function buildSnapshotIndex(sd: StructureDefinition | undefined): SnapshotIndex;
export declare function makeWalkerDeps(sdLoader: StructureDefinitionLoader, fhirVersion?: 'R4' | 'R5' | 'R6', typeIndexCache?: Map<string, SnapshotIndex | null>): WalkerDeps;
/**
 * Walk `resource` recursively against `index` and return one issue per
 * unrecognised key, descending through BackboneElement children and —
 * when a `WalkerDeps` is provided — into complex datatype children too.
 */
export declare function detectUnknownProperties(resource: any, index: SnapshotIndex, resourceType: string, sdUrl: string | undefined, deps?: WalkerDeps): Promise<ValidationIssue[]>;
export {};
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