/**
 * Validator: UI5 namespace.
 *
 * @param namespace - namepsace to validate
 * @param moduleName - module name
 * @param allowUnderscore - is underscore characters allowed
 * @returns true if valid, otherwise an error message string for use in Inquirer validation functions
 */
export declare function validateNamespace(namespace: string, moduleName?: string, allowUnderscore?: boolean): boolean | string;
/**
 * Validator: UI5 library module name.
 *
 * @param libName - library module name
 * @returns true if valid, otherwise an error message string for use in Inquirer validation functions
 */
export declare function validateLibModuleName(libName: string): boolean | string;
/**
 * Validator: UI5 project directory can be used to create a UI5 application.
 *
 * @param targetFolder - the directory path not including the application folder (UI5 application name)
 * @param projectName - the UI5 application directory name
 * @returns true if valid, otherwise an error message string for use in Inquirer validation function
 */
export declare function validateProjectFolder(targetFolder: string, projectName: string): boolean | string;
/**
 * Validator: UI5 package json module name validator. Validates a module name accoding to npm package rules and some additional UI5 specific rules.
 *
 * @param moduleName - module name to validate
 * @returns true if valid, otherwise an error message string for use in Inquirer validation functions
 */
export declare function validateModuleName(moduleName: string): boolean | string;
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