/**
 * ValueSet Cache
 *
 * Centralized caching layer for ValueSet and CodeSystem resolution.
 * Extracted from valueset-validator.ts for modularity.
 */
import type { ValueSet, CodeSystem } from './valueset-types';
export interface ServerExpansionEntry {
    codes: Set<string>;
    timestamp: number;
}
export declare class ValueSetCache {
    private valueSetCache;
    private codeSystemCache;
    private valueSetFileCache;
    private codeSystemFileCache;
    private serverExpansionCache;
    hasExpandedCodes(valueSetUrl: string): boolean;
    getExpandedCodes(valueSetUrl: string): Set<string> | undefined;
    setExpandedCodes(valueSetUrl: string, codes: Set<string>): void;
    hasValueSetFile(url: string): boolean;
    getValueSetFile(url: string): ValueSet | null | undefined;
    setValueSetFile(url: string, valueSet: ValueSet | null): void;
    hasCodeSystem(systemUrl: string): boolean;
    getCodeSystem(systemUrl: string): CodeSystem | undefined;
    setCodeSystem(systemUrl: string, codeSystem: CodeSystem): void;
    hasCodeSystemFile(url: string): boolean;
    getCodeSystemFile(url: string): CodeSystem | null | undefined;
    setCodeSystemFile(url: string, codeSystem: CodeSystem | null): void;
    getServerExpansion(cacheKey: string, ttlSeconds: number): Set<string> | null;
    setServerExpansion(cacheKey: string, codes: Set<string>): void;
    clear(): void;
    getStats(): {
        valueSetCount: number;
        codeSystemCount: number;
        fileCount: number;
        serverExpansionCount: number;
    };
}
export declare const valueSetCache: ValueSetCache;
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