export declare const isNull: (data: any) => data is null;
export declare const isUndefined: (data: any) => data is undefined;
export declare const isString: (data: any) => data is string;
export declare const isNumber: (data: any) => data is number;
export declare const isBoolean: (data: any) => data is boolean;
export declare const isNumberOrNaN: (data: any) => data is number;
export declare const isObject: (data: any) => data is any;
export declare const isArray: (data: any) => data is any[];
export declare const joinTypes: (...types: string[]) => string;