import TelemetryClient = require("../Library/TelemetryClient");
import Config = require("../Library/Config");
declare class HeartBeat {
    static INSTANCE: HeartBeat;
    private _collectionInterval;
    private _client;
    private _handle;
    private _isEnabled;
    private _isInitialized;
    private _isVM;
    private _vmData;
    private _azInst_vmId;
    private _azInst_subscriptionId;
    private _azInst_osType;
    constructor(client: TelemetryClient);
    enable(isEnabled: boolean, config?: Config): void;
    isInitialized(): boolean;
    static isEnabled(): boolean;
    trackHeartBeat(config: Config, callback: () => void): void;
    dispose(): void;
    private _getAzureComputeMetadata(config, callback);
    private _isJSON(str);
}
export = HeartBeat;