export declare function op(state: any): any[] | string | number | boolean | null;
export declare function string(state: any): string;
export declare function destruct(state: any): any[];
export declare function length(state: any): any[];
export declare function empty(state: any): boolean;
export declare function reverse(state: any): any[];
export declare function contains(state: any): boolean;
export declare function first(state: any): any;
export declare function last(state: any): any;
export declare function slice(state: any): any[];
export declare function concat(state: any): any[];
export declare function unique(state: any): any[];
export declare function check(state: any): boolean;
declare const _default: any;
export default _default;