import newrelicOriginal from "newrelic";
/**
 * "newrelic" is an optionalDependency so it might be not installed. This module fixes the typing
 * so the "null" check is required before using it.
 */
export declare let newrelic: typeof newrelicOriginal | undefined;
/**
 * Wrapper around newrelic.startSegment that calls the handler even if newrelic is not installed.
 */
export declare function startSegment<T extends PromiseLike<any>>(name: string, record: boolean, handler: T): T;
export declare function startSegment<T, C extends (...args: any[]) => any>(name: string, record: boolean, handler: (cb?: C) => T, callback?: C): T;
/**
 * Wrapper around newrelic.addCustomSpanAttribute that performs a no-op if newrelic is not installed.
 */
export declare function addCustomSpanAttribute(name: string, value: string | number): void;