import { ApmInterface } from './contracts/apm.interface';
export declare class Apm implements ApmInterface {
    start(apm?: string): Promise<void>;
    addCustomAttributes(attributes: any): Promise<void>;
    setTransactionName(name: string): Promise<void>;
    startSpan<T = any>(span: string, func: Function): Promise<T>;
    getBrowserTimingHeader(): string;
    recordMetric(name: string, value: any): void;
}