import { Span } from 'opentracing';
import { Observable } from 'rxjs';
/**
 * Traces a synchronous function by passing it a new child span.
 * The span is finished when the function returns.
 * If the function throws an Error, it is logged and the `error` tag set.
 *
 * @param operationName The operation name for the new span
 * @param childOf The parent span
 * @param operation The function to call
 */
export declare function traceSync<T>(operationName: string, childOf: Span, operation: (span: Span) => T): T;
/**
 * Traces a Promise-returning (or async) function by passing it a new child span.
 * The span is finished when the Promise is resolved.
 * If the Promise is rejected, the Error is logged and the `error` tag set.
 *
 * @param operationName The operation name for the new span
 * @param childOf The parent span
 * @param operation The function to call
 */
export declare function tracePromise<T>(operationName: string, childOf: Span, operation: (span: Span) => Promise<T>): Promise<T>;
/**
 * Traces an Observable-returning function by passing it a new child span.
 * The span is finished when the Observable completes or is unsubscribed from.
 * If the Observable errors or the function throws an Error, the Error is logged and the `error` tag set.
 *
 * @param operationName The operation name for the new span
 * @param childOf The parent span
 * @param operation The function to call
 */
export declare function traceObservable<T>(operationName: string, childOf: Span, operation: (span: Span) => Observable<T>): Observable<T>;