export type Many<T> = [T, T, ...T[]];
export type OneMany<T> = T | Many<T>;
export type Opt<T> = undefined | OneMany<T>;
export type Compare<T> = (a: T, b: T) => number;
declare const kSorted: unique symbol;
export type SortedMany<T> = Many<T> & {
    readonly [kSorted]: true;
};
export type SortedOneMany<T> = T | SortedMany<T>;
export type SortedOpt<T> = undefined | SortedOneMany<T>;
export declare class Sorted<T> {
    compare: Compare<T>;
    constructor(compare: Compare<T>);
    add<U extends NonNullable<T>>(data: SortedOpt<U>, item: U): SortedOneMany<U>;
    union<U extends NonNullable<T>>(a: SortedOpt<U>, b: SortedOpt<U>): SortedOpt<U>;
    filter<U extends NonNullable<T>>(data: SortedOpt<U>, cb: (item: U) => boolean): SortedOpt<U>;
    leadingRun<U extends NonNullable<T>, K>(data: SortedOpt<U>, key: (item: U) => K, compareKeys: Compare<K>, bound: K): SortedOpt<U>;
    range<U extends NonNullable<T>, K>(data: SortedOpt<U>, key: (item: U) => K, compareKeys: Compare<K>, bound: K): SortedOpt<U>;
    forEachRun<U extends NonNullable<T>, K>(data: SortedOpt<U>, key: (item: U) => K, compareKeys: Compare<K>, fn: (key: K, run: SortedOneMany<U>) => void): void;
    reduceRuns<U extends NonNullable<T>, K, R>(data: SortedOpt<U>, key: (item: U) => K, compareKeys: Compare<K>, fn: (acc: R, key: K, run: SortedOneMany<U>) => R, initial: R): R;
    find<U extends NonNullable<T>>(data: SortedOpt<U>, item: U): U | undefined;
    has<U extends NonNullable<T>>(data: SortedOpt<U>, item: U): boolean;
    findIndex<U extends NonNullable<T>>(data: SortedOpt<U>, item: U): number;
    intersects<U extends NonNullable<T>>(a: SortedOpt<U>, b: SortedOpt<U>): boolean;
    difference<U extends NonNullable<T>>(a: SortedOpt<U>, b: SortedOpt<U>): SortedOpt<U>;
    isSuperset<U extends NonNullable<T>>(superset: SortedOpt<U>, subset: SortedOpt<U>): boolean;
}
export declare function push<T>(data: Opt<T>, item: T): OneMany<T>;
export declare function concat<T>(a: Opt<T>, b: Opt<T>): Opt<T>;
export declare function size<T>(data: Opt<T>): number;
export declare function filter<T>(data: Opt<T>, cb: (item: T) => boolean): Opt<T>;
export declare function forEach<T>(data: Opt<T>, cb: (item: T, index: number) => void): void;
export declare function fromIter<T>(data: Iterable<T>): T | Many<T> | undefined;
export declare function find<T>(data: Opt<T>, cb: (item: T, index: number) => boolean): Opt<T>;
export declare function some<T>(data: Opt<T>, cb: (item: T, index: number) => unknown): boolean;
export declare function every<T>(data: Opt<T>, cb: (item: T, index: number) => boolean): boolean;
export declare function reduce<T, R>(data: Opt<T>, cb: (acc: R | undefined, item: T, index: number) => R | undefined): R | undefined;
export declare function reduce<T, R>(data: Opt<T>, cb: (acc: R, item: T, index: number) => R, initial: R): R;
export declare function reduceWhile<T, R>(data: Opt<T>, cb: (acc: R, item: T) => R | undefined, initial: R): R | undefined;
export declare function toArray<T, R>(data: Opt<T>, cb: (item: T, index: number) => R): R[];
export declare function toSet<T>(data: Opt<T>): Set<T>;
export declare function mapToString<T>(data: Opt<T>, sep: string, cb: (item: T, index: number) => string): string;
export declare function findSorted<T>(compare: Compare<T>, data: T[], item: T): T | undefined;
export declare function findIndexSorted<T>(compare: Compare<T>, data: T[], item: T): number;
export declare function addSorted<T, U extends T[]>(compare: Compare<T>, data: U, item: T): U;
export declare function at<T>(data: Opt<T>, index: number): T | undefined;
export declare function first<T>(data: OneMany<T>): T;
export declare function last<T>(data: OneMany<T>): T;
export declare function rest<T>(data: OneMany<T>): Opt<T>;
export {};