export interface Bitset extends Iterable { and(other: Bitset): Bitset; or(other: Bitset): Bitset; andNot(other: Bitset): Bitset; clone(): Bitset; add(num: number): Bitset; remove(num: number): Bitset; toArray(): Array; } export declare function emptySet(): Bitset; export declare function newSet(numbers?: Iterable): Bitset;