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import { WalkerState } from "../types";
type OnQueueEmptyCallback = (error: Error | null, output: WalkerState) => void;
/**
* This is a custom stateless queue to track concurrent async fs calls.
* It increments a counter whenever a call is queued and decrements it
* as soon as it completes. When the counter hits 0, it calls onQueueEmpty.
*/
export declare class Queue {
private onQueueEmpty?;
count: number;
constructor(onQueueEmpty?: OnQueueEmptyCallback | undefined);
enqueue(): number;
dequeue(error: Error | null, output: WalkerState): void;
}
export {};