export declare class Affix<A> {
    size: number;
    len: number;
    a: A;
    b: A;
    c: A;
    d: A;
    constructor(size: number, len: number, a: A, b?: A, c?: A, d?: A);
    toArray(): A[];
    get(idx: number): A;
}
export declare class NNode<A> {
    size: number;
    three: boolean;
    a: A;
    b: A;
    c: A;
    constructor(size: number, three: boolean, a: A, b: A, c?: A);
    get(idx: number): A;
}
export declare class FingerTree<A> {
    depth: number;
    size: number;
    prefix: Affix<A>;
    deeper: FingerTree<NNode<A>>;
    suffix: Affix<A>;
    constructor(depth: number, size: number, prefix: Affix<A>, deeper: FingerTree<NNode<A>>, suffix: Affix<A>);
}
export declare const nil: FingerTree<any>;
export declare function prepend<A>(a: A, t: FingerTree<A>): FingerTree<A>;
export declare function nrPrepend<A>(depth: number, size: number, a: A, t: FingerTree<A>): FingerTree<A>;
export declare function append<A>(a: A, t: FingerTree<A>): FingerTree<A>;
export declare function size(t: FingerTree<any>): number;
export declare function concat<A>(t1: FingerTree<A>, t2: FingerTree<A>): FingerTree<A>;
export declare function get<A>(idx: number, tree: FingerTree<A>): A;
export declare function foldl<A, B>(f: (b: B, a: A) => B, initial: B, list: FingerTree<A>): B;
export declare function toArray<A>(t: FingerTree<A>): A[];