import { AbortOptions, MaybePromise } from '@mithic/commons';
/** A queue data structure. */
export interface Queue<T> {
    /** Returns the first item of this {@link Queue}, or undefined if empty. */
    front?(options?: AbortOptions): MaybePromise<T | undefined>;
    /** Adds an item to this {@link Queue}. */
    push(item: T, options?: AbortOptions): MaybePromise<unknown>;
    /** Removes and returns the first item of this {@link Queue}, or undefined if empty. */
    shift(options?: AbortOptions): MaybePromise<T | undefined>;
}
/** A {@link Queue} that supports peeking the front element. */
export interface PeekableQueue<T> extends Queue<T> {
    front(options?: AbortOptions): MaybePromise<T | undefined>;
}
/** A {@link Queue} with synchronous operations. */
export interface SyncQueue<T> extends Queue<T> {
    front?(): T | undefined;
    push(item: T): void;
    shift(): T | undefined;
}
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