/**
 * Copyright (c) Double Symmetry GmbH
 * Commercial use requires a license. See https://rntp.dev/pricing
 */
import type { ResolvedMediaItem } from './engines/AudioEngine';
/**
 * Pure queue state for the web backend. Ports the iOS `QueueManager`
 * behavioral contract (see ios/tests/QueueManagerTests.swift).
 *
 * `items` is the canonical queue. When shuffle is enabled, `playOrder` is a
 * permutation of canonical indices and navigation walks it; the canonical
 * queue and `currentIndex` (canonical) are unaffected by shuffle state.
 */
export declare class QueueManager {
    items: ResolvedMediaItem[];
    currentIndex: number;
    private playOrder;
    get current(): ResolvedMediaItem | null;
    add(newItems: ResolvedMediaItem[]): void;
    insert(index: number, newItems: ResolvedMediaItem[]): void;
    /** Returns true if the removed item was the current item. */
    remove(index: number): boolean;
    /** Removes [fromIndex, toIndex). Returns true if the current item was removed. */
    removeRange(fromIndex: number, toIndex: number): boolean;
    replace(index: number, item: ResolvedMediaItem): void;
    move(fromIndex: number, toIndex: number): void;
    clear(): void;
    jump(index: number): void;
    next(wrap: boolean): boolean;
    previous(wrap: boolean): boolean;
    setShuffleEnabled(enabled: boolean): void;
    isShuffleEnabled(): boolean;
    /** Fisher–Yates over all indices, current item pinned first. */
    private rebuildPlayOrder;
    private step;
}
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