/**
 *
 * @param value
 * @returns {boolean}
 */
export declare function isFunction(value: any): value is Function;
/**
 *
 * @param value
 * @returns {boolean}
 */
export declare function isObject<T = object>(value: any): value is T;
/**
 *
 * @param value
 * @returns {any}
 */
export declare function isEmpty(value: any): any;
/**
 * Whether the provided value is considered a number.
 * @docs-private
 */
export declare function isNumber(value: any): value is number;
/**
 * Performs a deep comparison between two values to determine if they are equivalent.
 * @param valueA
 * @param valueB
 * @returns {boolean}
 */
export declare function isEqual(valueA: any, valueB: any): boolean;
/**
 * Check if a value is of type string
 * @param value
 * @return {boolean}
 */
export declare function isString(value: any): value is string;
/**
 * Check if null or undefined
 * @param value
 * @return {boolean}
 */
export declare function isNil(value: any): boolean;
export declare function isBoolean(value: any): value is boolean;