import type { UrlString } from './types.js';
export interface NextWaiter {
    resolve: (release: (() => void) | null) => void;
    wake: () => void;
}
export interface UrlState {
    count: number;
    nextWaiter: NextWaiter | null;
    abortController: AbortController;
}
export interface RangeSlotManagerOptions {
    maxConcurrentRangesPerUrl: number;
    prioritizeLatestRequest: boolean;
    maxTrackedUrls: number;
}
export interface RangeSlotManager {
    acquireRangeSlot: (url: UrlString) => Promise<(() => void) | null>;
    getOrCreateUrlState: (url: UrlString) => UrlState;
}
export declare function mergeAbortSignals(...signals: AbortSignal[]): AbortSignal;
export declare function createRangeSlotManager(options: RangeSlotManagerOptions): RangeSlotManager;