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declare class Denque { length: number; constructor(); constructor(array: T[]); constructor(array: T[], options: IDenqueOptions); push(item: T): number; unshift(item: T): number; pop(): T | undefined; shift(): T | undefined; peekBack(): T | undefined; peekFront(): T | undefined; peekAt(index: number): T | undefined; get(index: number): T | undefined; remove