import * as O from "../Option";
export declare class ImmutableQueue<A> {
   private readonly backing;
   constructor(backing: readonly A[]);
   push(a: A): ImmutableQueue<A>;
   prepend(a: A): ImmutableQueue<A>;
   get size(): number;
   dequeue(): O.Option<readonly [A, ImmutableQueue<A>]>;
   find(f: (a: A) => boolean): O.Option<A>;
   filter(f: (a: A) => boolean): ImmutableQueue<A>;
}
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