export declare class Util {
    private static _instance;
    private _listenerAttached;
    isNodeExit: boolean;
    static getInstance(): Util;
    constructor();
    /**
     * helper method to trim strings (IE8 does not implement String.prototype.trim)
     */
    trim(str: string): string;
    /**
     * Check if an object is of type Array
     */
    isArray(obj: any): boolean;
    /**
     * Check if an object is of type Error
     */
    isError(obj: any): boolean;
    isPrimitive(input: any): boolean;
    /**
     * Check if an object is of type Date
     */
    isDate(obj: any): boolean;
    /**
     * Convert milliseconds to Breeze expected time.
     * @internal
     */
    msToTimeSpan(ms: number): string;
    /**
     * Using JSON.stringify, by default Errors do not serialize to something useful:
     * Simplify a generic Node Error into a simpler map for customDimensions
     * Custom errors can still implement toJSON to override this functionality
     */
    protected extractError(err: Error): {
        message: string;
        code: string;
    };
    isDbDependency(dependencyType: string): boolean;
    /**
     * Returns string representation of an object suitable for diagnostics diag.
     */
    dumpObj(object: any): string;
    stringify(payload: any): string;
    private _addCloseHandler;
}