export declare function is(val: unknown, type: string): boolean;
export declare function isDef<T = unknown>(val?: T): val is T;
export declare function isUnDef<T = unknown>(val?: T): val is T;
export declare function isObject(val: any): val is Record<any, any>;
export declare function isArray(val: any): val is Array<any>;
export declare function isEmpty<T = unknown>(val: T): val is T;
export declare function isDate(val: unknown): val is Date;
export declare function isNull(val: unknown): val is null;
export declare function isNullAndUnDef(val: unknown): val is null | undefined;
export declare function isNullOrUnDef(val: unknown): val is null | undefined;
export declare const isNumber: (target: unknown) => target is Number;
export declare const isString: (target: unknown) => target is String;
export declare const isBoolean: (target: unknown) => target is Boolean;
export declare const isFunction: (target: unknown) => target is Function;
export declare function isElement(val: unknown): val is Element;
export declare const isSuccessful: <T = any>(response: PromiseSettledResult<T>) => response is PromiseFulfilledResult<T>;