export declare const numberIsFinite: (number: unknown) => boolean;
export declare function isNumber(param: any): boolean;
/**
 * Check if the value is a String
 *
 * @name isString
 * @param param Value to be checked
 * @returns {boolean} Returns true when the `param` is a String
 */
export declare const isString: (value?: any) => value is string;
/**
 * Check if `param` is defined.
 *
 * @param {*} param The value to check
 * @returns {boolean} Returns `false` when `param` is `undefined` otherwise true.
 */
export declare function isDefined(param: any): boolean;