/*!
 * Copyright (c) Microsoft. All rights reserved.
 */
import { TelemetryHelperBase } from "../../common/helpers/telemetry/TelemetryHelperBase";
import { TelemetryProperties } from "../../common/telemetryclient";
export declare class TelemetryHelper extends TelemetryHelperBase {
    static instance(): TelemetryHelper;
    private static _instance;
    private constructor();
    /**
     * @override
     */
    addCustomProperties(properties?: TelemetryProperties, cv?: string): TelemetryProperties;
}