/**
 * JavaScript port from java.util.TreeSet.
 */
export declare class TreeSet<T extends string | number> {
    array: T[];
    properties: {
        [key: string | number]: boolean;
    };
    comparator: {
        compare: (a: T, b: T) => number;
    };
    constructor();
    add(value: T): void;
    size(): number;
    contains(value: T): boolean;
    last(): T;
}
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