export declare class Deque<T> {
    private items;
    private head;
    private tail;
    private count;
    constructor(initialCapacity?: number);
    get length(): number;
    push(item: T): void;
    shift(): T | undefined;
    unshift(item: T): void;
    clear(): void;
    indexOf(item: T): number;
    splice(start: number, deleteCount: number): T[];
    private resize;
    drain(): Generator<T>;
}
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