export declare function isNumber(val: unknown): val is number;
export declare function isBoolean(val: unknown): val is boolean;
export declare function isArray(val: unknown): val is any[];
export declare function isObject(val: unknown): val is Record<string, any>;
export declare function isString(val: unknown): val is string;
export declare function isUndefined(val: unknown): val is undefined;
export declare function isFunction(val: unknown): val is Function;
export declare function isNotEmptyObject<T>(obj: T): boolean;