export declare function isNull(value: any): value is null;
export declare function isUndefined(value: any): value is undefined;
export declare function isDefined(value: any): boolean;
export declare function isNil(value: any): value is null | undefined;
export declare function isNilOrEmpty(value: any): boolean;
export declare function isString(value: any): value is string;
export declare function isNumber(value: any): value is number;
export declare function isArray<T>(value: any): value is Array<T>;
export declare function isEmptyArray(value: any): boolean;
export declare function isFunction(value: any): value is Function;
export declare function isPlainObject(value: any): value is Record<string, any>;
export declare function isPromise(value: any): boolean;