import type { Expression, Extension, Questionnaire } from 'fhir/r4';
import type { Variables } from '../../interfaces/variables.interface';
export declare function extractQuestionnaireLevelVariables(questionnaire: Questionnaire): Variables;
/**
 * Get fhirpath variables from an array of extensions
 *
 * @author Sean Fong
 */
export declare function getFhirPathVariables(extensions: Extension[]): Expression[];
/**
 * Get x-fhir-query variables from an array of extensions
 *
 * @author Sean Fong
 */
export declare function getXFhirQueryVariables(extensions: Extension[]): Expression[];