/**
 * Tree Shaker
 *
 * Starting from a set of root canonical URLs (the profiles the user
 * actually references), walk the transitive closure of all outgoing
 * canonical references. Any pinned canonical NOT in the closure is
 * dropped.
 *
 * This dramatically reduces the working set — e.g. hl7.terminology.r4
 * goes from 4158 canonicals to ~7 when only US Core is installed.
 */
import type { PinnedCanonical } from './types';
export interface CanonicalGraph {
    outgoingRefs: Map<string, Set<string>>;
}
export declare function treeShake(pinned: Map<string, PinnedCanonical>, roots: string[], graph: CanonicalGraph): Map<string, PinnedCanonical>;
/**
 * Extract outgoing canonical references from a FHIR resource JSON.
 * Checks fields that contain canonical references per the FHIR spec:
 * - StructureDefinition: baseDefinition, type, targetProfile, profile
 * - ValueSet: compose.include[].system, compose.include[].valueSet
 * - CodeSystem: valueSet
 * - SearchParameter: base, expression
 */
export declare function extractOutgoingRefs(resource: Record<string, unknown>): string[];
//# sourceMappingURL=tree-shaker.d.ts.map