export interface WriteQueueState {
    readonly accepting: boolean;
    readonly running: boolean;
    readonly waiting: number;
}
type WriteOperation<T> = () => T | PromiseLike<T>;
export declare const WRITE_QUEUE_RETRY_AFTER_SECONDS = 1;
export declare class WriteQueue<T> {
    #private;
    constructor(waitingCapacity: number);
    get accepting(): boolean;
    get running(): boolean;
    get waiting(): number;
    get state(): WriteQueueState;
    enqueue(operation: WriteOperation<T>): Promise<T>;
    close(): Promise<void>;
    drain(): Promise<void>;
}
export {};
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