import type { FhirVersion } from './valueset-expansion-cache-key';
import type { ValueSetPackageLoader } from './valueset-package-loader';
export type TwoPhaseExpansionCoverage = 'complete' | 'partial' | 'none';
export interface TwoPhaseLookupResult {
    status: 'hit' | 'miss' | 'unknown';
    coverage: TwoPhaseExpansionCoverage;
    source: 'expansion' | 'compose' | 'none';
    codeCount: number;
    durationMs: number;
}
export declare class TwoPhaseTerminologyExpansion {
    private packageLoader;
    private cache;
    private static readonly MAX_COMPOSITION_DEPTH;
    constructor(packageLoader: ValueSetPackageLoader);
    clear(): void;
    lookup(code: string, system: string | undefined, valueSetUrl: string, fhirVersion?: FhirVersion): Promise<TwoPhaseLookupResult>;
    private getExpansion;
    private buildExpansion;
    private collectExpansionCodes;
    private collectComposeEntry;
}
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