/**
 * -------------------------------------------------------------------------------------------
 * Copyright (c) Microsoft Corporation.  All Rights Reserved.  Licensed under the MIT License.
 * See License in the project root for license information.
 * -------------------------------------------------------------------------------------------
 */
export type Guid = string;
/**
 * Checks if the string is a valid GUID.
 * @param source the string to check.
 * @returns unchanged string if it is a valid GUID; otherwise, undefined.
 */
export declare const parseGuidString: (source?: string) => string | undefined;
/**
 * Generates a GUID.
 * @returns a GUID.
 */
export declare const createGuid: () => string;
/**
 * Generates a empty GUID.
 * @returns a empty GUID.
 */
export declare const createEmptyGuid: () => string;
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