export declare function IsNull(value: unknown): boolean;
export declare function IsUndefined(value: unknown): boolean;
export declare function IsNon(value: unknown): boolean;
export declare function IsBoolean(value: unknown): boolean;
export declare function IsString(value: unknown): boolean;
export declare function IsDate(value: unknown): boolean;
export declare function IsEmptyString(value: unknown): boolean;
export declare function IsArray(value: unknown): boolean;
export declare function IsOptional(value: boolean): boolean;
export declare function IsNumber(value: unknown): boolean;
export declare function IsLessThanNil(value: unknown): boolean;
export declare function IsGreatThanNil(value: unknown): boolean;
export declare function IsObject(value: unknown): boolean;
export declare function IsJson(value: unknown): boolean;