import type { Expression, Extension, QuestionnaireItem } from 'fhir/r4';
import type { CalculatedExpression } from '../interfaces/calculatedExpression.interface';
import type { AnswerOptionsToggleExpression } from '../interfaces/answerOptionsToggleExpression.interface';
/**
 * Get enableWhenExpression.valueExpression if its present in item
 *
 * @author Sean Fong
 */
export declare function getInitialExpression(qItem: QuestionnaireItem): Expression | null;
/**
 * Get enableWhenExpression.valueExpression if its present in item
 *
 * @author Sean Fong
 */
export declare function getEnableWhenExpression(qItem: QuestionnaireItem): Expression | null;
/**
 * Get calculatedExpression.valueExpression if its present in item, item._text or item._prefix
 *
 * @author Sean Fong
 */
export declare function getCalculatedExpressions(qItem: QuestionnaireItem): CalculatedExpression[];
export declare function findCalculatedExpressionsInExtensions(extensions: Extension[]): Extension[];
/**
 * Get answerExpression.valueExpression if its present in item
 *
 * @author Sean Fong
 */
export declare function getAnswerExpression(qItem: QuestionnaireItem): Expression | null;
/**
 * Get answerOptionsToggleExpressions if its present in item
 *
 * @author Sean Fong
 */
export declare function getAnswerOptionsToggleExpressions(qItem: QuestionnaireItem): AnswerOptionsToggleExpression[] | null;