@jakexchan/node-queue/dist/index.js

A CommonJS package for p-queue.

'use strict';

function getDefaultExportFromCjs (x) {
	return x && x.__esModule && Object.prototype.hasOwnProperty.call(x, 'default') ? x['default'] : x;
}

var eventemitter3 = {exports: {}};

(function (module) {

	var has = Object.prototype.hasOwnProperty
	  , prefix = '~';

	/**
	 * Constructor to create a storage for our `EE` objects.
	 * An `Events` instance is a plain object whose properties are event names.
	 *
	 * @constructor
	 * @private
	 */
	function Events() {}

	//
	// We try to not inherit from `Object.prototype`. In some engines creating an
	// instance in this way is faster than calling `Object.create(null)` directly.
	// If `Object.create(null)` is not supported we prefix the event names with a
	// character to make sure that the built-in object properties are not
	// overridden or used as an attack vector.
	//
	if (Object.create) {
	  Events.prototype = Object.create(null);

	  //
	  // This hack is needed because the `__proto__` property is still inherited in
	  // some old browsers like Android 4, iPhone 5.1, Opera 11 and Safari 5.
	  //
	  if (!new Events().__proto__) prefix = false;
	}

	/**
	 * Representation of a single event listener.
	 *
	 * @param {Function} fn The listener function.
	 * @param {*} context The context to invoke the listener with.
	 * @param {Boolean} [once=false] Specify if the listener is a one-time listener.
	 * @constructor
	 * @private
	 */
	function EE(fn, context, once) {
	  this.fn = fn;
	  this.context = context;
	  this.once = once || false;
	}

	/**
	 * Add a listener for a given event.
	 *
	 * @param {EventEmitter} emitter Reference to the `EventEmitter` instance.
	 * @param {(String|Symbol)} event The event name.
	 * @param {Function} fn The listener function.
	 * @param {*} context The context to invoke the listener with.
	 * @param {Boolean} once Specify if the listener is a one-time listener.
	 * @returns {EventEmitter}
	 * @private
	 */
	function addListener(emitter, event, fn, context, once) {
	  if (typeof fn !== 'function') {
	    throw new TypeError('The listener must be a function');
	  }

	  var listener = new EE(fn, context || emitter, once)
	    , evt = prefix ? prefix + event : event;

	  if (!emitter._events[evt]) emitter._events[evt] = listener, emitter._eventsCount++;
	  else if (!emitter._events[evt].fn) emitter._events[evt].push(listener);
	  else emitter._events[evt] = [emitter._events[evt], listener];

	  return emitter;
	}

	/**
	 * Clear event by name.
	 *
	 * @param {EventEmitter} emitter Reference to the `EventEmitter` instance.
	 * @param {(String|Symbol)} evt The Event name.
	 * @private
	 */
	function clearEvent(emitter, evt) {
	  if (--emitter._eventsCount === 0) emitter._events = new Events();
	  else delete emitter._events[evt];
	}

	/**
	 * Minimal `EventEmitter` interface that is molded against the Node.js
	 * `EventEmitter` interface.
	 *
	 * @constructor
	 * @public
	 */
	function EventEmitter() {
	  this._events = new Events();
	  this._eventsCount = 0;
	}

	/**
	 * Return an array listing the events for which the emitter has registered
	 * listeners.
	 *
	 * @returns {Array}
	 * @public
	 */
	EventEmitter.prototype.eventNames = function eventNames() {
	  var names = []
	    , events
	    , name;

	  if (this._eventsCount === 0) return names;

	  for (name in (events = this._events)) {
	    if (has.call(events, name)) names.push(prefix ? name.slice(1) : name);
	  }

	  if (Object.getOwnPropertySymbols) {
	    return names.concat(Object.getOwnPropertySymbols(events));
	  }

	  return names;
	};

	/**
	 * Return the listeners registered for a given event.
	 *
	 * @param {(String|Symbol)} event The event name.
	 * @returns {Array} The registered listeners.
	 * @public
	 */
	EventEmitter.prototype.listeners = function listeners(event) {
	  var evt = prefix ? prefix + event : event
	    , handlers = this._events[evt];

	  if (!handlers) return [];
	  if (handlers.fn) return [handlers.fn];

	  for (var i = 0, l = handlers.length, ee = new Array(l); i < l; i++) {
	    ee[i] = handlers[i].fn;
	  }

	  return ee;
	};

	/**
	 * Return the number of listeners listening to a given event.
	 *
	 * @param {(String|Symbol)} event The event name.
	 * @returns {Number} The number of listeners.
	 * @public
	 */
	EventEmitter.prototype.listenerCount = function listenerCount(event) {
	  var evt = prefix ? prefix + event : event
	    , listeners = this._events[evt];

	  if (!listeners) return 0;
	  if (listeners.fn) return 1;
	  return listeners.length;
	};

	/**
	 * Calls each of the listeners registered for a given event.
	 *
	 * @param {(String|Symbol)} event The event name.
	 * @returns {Boolean} `true` if the event had listeners, else `false`.
	 * @public
	 */
	EventEmitter.prototype.emit = function emit(event, a1, a2, a3, a4, a5) {
	  var evt = prefix ? prefix + event : event;

	  if (!this._events[evt]) return false;

	  var listeners = this._events[evt]
	    , len = arguments.length
	    , args
	    , i;

	  if (listeners.fn) {
	    if (listeners.once) this.removeListener(event, listeners.fn, undefined, true);

	    switch (len) {
	      case 1: return listeners.fn.call(listeners.context), true;
	      case 2: return listeners.fn.call(listeners.context, a1), true;
	      case 3: return listeners.fn.call(listeners.context, a1, a2), true;
	      case 4: return listeners.fn.call(listeners.context, a1, a2, a3), true;
	      case 5: return listeners.fn.call(listeners.context, a1, a2, a3, a4), true;
	      case 6: return listeners.fn.call(listeners.context, a1, a2, a3, a4, a5), true;
	    }

	    for (i = 1, args = new Array(len -1); i < len; i++) {
	      args[i - 1] = arguments[i];
	    }

	    listeners.fn.apply(listeners.context, args);
	  } else {
	    var length = listeners.length
	      , j;

	    for (i = 0; i < length; i++) {
	      if (listeners[i].once) this.removeListener(event, listeners[i].fn, undefined, true);

	      switch (len) {
	        case 1: listeners[i].fn.call(listeners[i].context); break;
	        case 2: listeners[i].fn.call(listeners[i].context, a1); break;
	        case 3: listeners[i].fn.call(listeners[i].context, a1, a2); break;
	        case 4: listeners[i].fn.call(listeners[i].context, a1, a2, a3); break;
	        default:
	          if (!args) for (j = 1, args = new Array(len -1); j < len; j++) {
	            args[j - 1] = arguments[j];
	          }

	          listeners[i].fn.apply(listeners[i].context, args);
	      }
	    }
	  }

	  return true;
	};

	/**
	 * Add a listener for a given event.
	 *
	 * @param {(String|Symbol)} event The event name.
	 * @param {Function} fn The listener function.
	 * @param {*} [context=this] The context to invoke the listener with.
	 * @returns {EventEmitter} `this`.
	 * @public
	 */
	EventEmitter.prototype.on = function on(event, fn, context) {
	  return addListener(this, event, fn, context, false);
	};

	/**
	 * Add a one-time listener for a given event.
	 *
	 * @param {(String|Symbol)} event The event name.
	 * @param {Function} fn The listener function.
	 * @param {*} [context=this] The context to invoke the listener with.
	 * @returns {EventEmitter} `this`.
	 * @public
	 */
	EventEmitter.prototype.once = function once(event, fn, context) {
	  return addListener(this, event, fn, context, true);
	};

	/**
	 * Remove the listeners of a given event.
	 *
	 * @param {(String|Symbol)} event The event name.
	 * @param {Function} fn Only remove the listeners that match this function.
	 * @param {*} context Only remove the listeners that have this context.
	 * @param {Boolean} once Only remove one-time listeners.
	 * @returns {EventEmitter} `this`.
	 * @public
	 */
	EventEmitter.prototype.removeListener = function removeListener(event, fn, context, once) {
	  var evt = prefix ? prefix + event : event;

	  if (!this._events[evt]) return this;
	  if (!fn) {
	    clearEvent(this, evt);
	    return this;
	  }

	  var listeners = this._events[evt];

	  if (listeners.fn) {
	    if (
	      listeners.fn === fn &&
	      (!once || listeners.once) &&
	      (!context || listeners.context === context)
	    ) {
	      clearEvent(this, evt);
	    }
	  } else {
	    for (var i = 0, events = [], length = listeners.length; i < length; i++) {
	      if (
	        listeners[i].fn !== fn ||
	        (once && !listeners[i].once) ||
	        (context && listeners[i].context !== context)
	      ) {
	        events.push(listeners[i]);
	      }
	    }

	    //
	    // Reset the array, or remove it completely if we have no more listeners.
	    //
	    if (events.length) this._events[evt] = events.length === 1 ? events[0] : events;
	    else clearEvent(this, evt);
	  }

	  return this;
	};

	/**
	 * Remove all listeners, or those of the specified event.
	 *
	 * @param {(String|Symbol)} [event] The event name.
	 * @returns {EventEmitter} `this`.
	 * @public
	 */
	EventEmitter.prototype.removeAllListeners = function removeAllListeners(event) {
	  var evt;

	  if (event) {
	    evt = prefix ? prefix + event : event;
	    if (this._events[evt]) clearEvent(this, evt);
	  } else {
	    this._events = new Events();
	    this._eventsCount = 0;
	  }

	  return this;
	};

	//
	// Alias methods names because people roll like that.
	//
	EventEmitter.prototype.off = EventEmitter.prototype.removeListener;
	EventEmitter.prototype.addListener = EventEmitter.prototype.on;

	//
	// Expose the prefix.
	//
	EventEmitter.prefixed = prefix;

	//
	// Allow `EventEmitter` to be imported as module namespace.
	//
	EventEmitter.EventEmitter = EventEmitter;

	//
	// Expose the module.
	//
	{
	  module.exports = EventEmitter;
	} 
} (eventemitter3));

var eventemitter3Exports = eventemitter3.exports;
var EventEmitter = /*@__PURE__*/getDefaultExportFromCjs(eventemitter3Exports);

class TimeoutError extends Error {
	constructor(message) {
		super(message);
		this.name = 'TimeoutError';
	}
}

/**
An error to be thrown when the request is aborted by AbortController.
DOMException is thrown instead of this Error when DOMException is available.
*/
class AbortError extends Error {
	constructor(message) {
		super();
		this.name = 'AbortError';
		this.message = message;
	}
}

/**
TODO: Remove AbortError and just throw DOMException when targeting Node 18.
*/
const getDOMException = errorMessage => globalThis.DOMException === undefined
	? new AbortError(errorMessage)
	: new DOMException(errorMessage);

/**
TODO: Remove below function and just 'reject(signal.reason)' when targeting Node 18.
*/
const getAbortedReason = signal => {
	const reason = signal.reason === undefined
		? getDOMException('This operation was aborted.')
		: signal.reason;

	return reason instanceof Error ? reason : getDOMException(reason);
};

function pTimeout(promise, options) {
	const {
		milliseconds,
		fallback,
		message,
		customTimers = {setTimeout, clearTimeout},
	} = options;

	let timer;
	let abortHandler;

	const wrappedPromise = new Promise((resolve, reject) => {
		if (typeof milliseconds !== 'number' || Math.sign(milliseconds) !== 1) {
			throw new TypeError(`Expected \`milliseconds\` to be a positive number, got \`${milliseconds}\``);
		}

		if (options.signal) {
			const {signal} = options;
			if (signal.aborted) {
				reject(getAbortedReason(signal));
			}

			abortHandler = () => {
				reject(getAbortedReason(signal));
			};

			signal.addEventListener('abort', abortHandler, {once: true});
		}

		if (milliseconds === Number.POSITIVE_INFINITY) {
			promise.then(resolve, reject);
			return;
		}

		// We create the error outside of `setTimeout` to preserve the stack trace.
		const timeoutError = new TimeoutError();

		timer = customTimers.setTimeout.call(undefined, () => {
			if (fallback) {
				try {
					resolve(fallback());
				} catch (error) {
					reject(error);
				}

				return;
			}

			if (typeof promise.cancel === 'function') {
				promise.cancel();
			}

			if (message === false) {
				resolve();
			} else if (message instanceof Error) {
				reject(message);
			} else {
				timeoutError.message = message ?? `Promise timed out after ${milliseconds} milliseconds`;
				reject(timeoutError);
			}
		}, milliseconds);

		(async () => {
			try {
				resolve(await promise);
			} catch (error) {
				reject(error);
			}
		})();
	});

	const cancelablePromise = wrappedPromise.finally(() => {
		cancelablePromise.clear();
		if (abortHandler && options.signal) {
			options.signal.removeEventListener('abort', abortHandler);
		}
	});

	cancelablePromise.clear = () => {
		customTimers.clearTimeout.call(undefined, timer);
		timer = undefined;
	};

	return cancelablePromise;
}

// Port of lower_bound from https://en.cppreference.com/w/cpp/algorithm/lower_bound
// Used to compute insertion index to keep queue sorted after insertion
function lowerBound(array, value, comparator) {
    let first = 0;
    let count = array.length;
    while (count > 0) {
        const step = Math.trunc(count / 2);
        let it = first + step;
        if (comparator(array[it], value) <= 0) {
            first = ++it;
            count -= step + 1;
        }
        else {
            count = step;
        }
    }
    return first;
}

class PriorityQueue {
    #queue = [];
    enqueue(run, options) {
        options = {
            priority: 0,
            ...options,
        };
        const element = {
            priority: options.priority,
            id: options.id,
            run,
        };
        if (this.size === 0 || this.#queue[this.size - 1].priority >= options.priority) {
            this.#queue.push(element);
            return;
        }
        const index = lowerBound(this.#queue, element, (a, b) => b.priority - a.priority);
        this.#queue.splice(index, 0, element);
    }
    setPriority(id, priority) {
        const index = this.#queue.findIndex((element) => element.id === id);
        if (index === -1) {
            throw new ReferenceError(`No promise function with the id "${id}" exists in the queue.`);
        }
        const [item] = this.#queue.splice(index, 1);
        this.enqueue(item.run, { priority, id });
    }
    dequeue() {
        const item = this.#queue.shift();
        return item?.run;
    }
    filter(options) {
        return this.#queue.filter((element) => element.priority === options.priority).map((element) => element.run);
    }
    get size() {
        return this.#queue.length;
    }
}

/**
Promise queue with concurrency control.
*/
class PQueue extends EventEmitter {
    #carryoverConcurrencyCount;
    #isIntervalIgnored;
    #intervalCount = 0;
    #intervalCap;
    #interval;
    #intervalEnd = 0;
    #intervalId;
    #timeoutId;
    #queue;
    #queueClass;
    #pending = 0;
    // The `!` is needed because of https://github.com/microsoft/TypeScript/issues/32194
    #concurrency;
    #isPaused;
    #throwOnTimeout;
    // Use to assign a unique identifier to a promise function, if not explicitly specified
    #idAssigner = 1n;
    /**
    Per-operation timeout in milliseconds. Operations fulfill once `timeout` elapses if they haven't already.

    Applies to each future operation.
    */
    timeout;
    // TODO: The `throwOnTimeout` option should affect the return types of `add()` and `addAll()`
    constructor(options) {
        super();
        // eslint-disable-next-line @typescript-eslint/consistent-type-assertions
        options = {
            carryoverConcurrencyCount: false,
            intervalCap: Number.POSITIVE_INFINITY,
            interval: 0,
            concurrency: Number.POSITIVE_INFINITY,
            autoStart: true,
            queueClass: PriorityQueue,
            ...options,
        };
        if (!(typeof options.intervalCap === 'number' && options.intervalCap >= 1)) {
            throw new TypeError(`Expected \`intervalCap\` to be a number from 1 and up, got \`${options.intervalCap?.toString() ?? ''}\` (${typeof options.intervalCap})`);
        }
        if (options.interval === undefined || !(Number.isFinite(options.interval) && options.interval >= 0)) {
            throw new TypeError(`Expected \`interval\` to be a finite number >= 0, got \`${options.interval?.toString() ?? ''}\` (${typeof options.interval})`);
        }
        this.#carryoverConcurrencyCount = options.carryoverConcurrencyCount;
        this.#isIntervalIgnored = options.intervalCap === Number.POSITIVE_INFINITY || options.interval === 0;
        this.#intervalCap = options.intervalCap;
        this.#interval = options.interval;
        this.#queue = new options.queueClass();
        this.#queueClass = options.queueClass;
        this.concurrency = options.concurrency;
        this.timeout = options.timeout;
        this.#throwOnTimeout = options.throwOnTimeout === true;
        this.#isPaused = options.autoStart === false;
    }
    get #doesIntervalAllowAnother() {
        return this.#isIntervalIgnored || this.#intervalCount < this.#intervalCap;
    }
    get #doesConcurrentAllowAnother() {
        return this.#pending < this.#concurrency;
    }
    #next() {
        this.#pending--;
        this.#tryToStartAnother();
        this.emit('next');
    }
    #onResumeInterval() {
        this.#onInterval();
        this.#initializeIntervalIfNeeded();
        this.#timeoutId = undefined;
    }
    get #isIntervalPaused() {
        const now = Date.now();
        if (this.#intervalId === undefined) {
            const delay = this.#intervalEnd - now;
            if (delay < 0) {
                // Act as the interval was done
                // We don't need to resume it here because it will be resumed on line 160
                this.#intervalCount = (this.#carryoverConcurrencyCount) ? this.#pending : 0;
            }
            else {
                // Act as the interval is pending
                if (this.#timeoutId === undefined) {
                    this.#timeoutId = setTimeout(() => {
                        this.#onResumeInterval();
                    }, delay);
                }
                return true;
            }
        }
        return false;
    }
    #tryToStartAnother() {
        if (this.#queue.size === 0) {
            // We can clear the interval ("pause")
            // Because we can redo it later ("resume")
            if (this.#intervalId) {
                clearInterval(this.#intervalId);
            }
            this.#intervalId = undefined;
            this.emit('empty');
            if (this.#pending === 0) {
                this.emit('idle');
            }
            return false;
        }
        if (!this.#isPaused) {
            const canInitializeInterval = !this.#isIntervalPaused;
            if (this.#doesIntervalAllowAnother && this.#doesConcurrentAllowAnother) {
                const job = this.#queue.dequeue();
                if (!job) {
                    return false;
                }
                this.emit('active');
                job();
                if (canInitializeInterval) {
                    this.#initializeIntervalIfNeeded();
                }
                return true;
            }
        }
        return false;
    }
    #initializeIntervalIfNeeded() {
        if (this.#isIntervalIgnored || this.#intervalId !== undefined) {
            return;
        }
        this.#intervalId = setInterval(() => {
            this.#onInterval();
        }, this.#interval);
        this.#intervalEnd = Date.now() + this.#interval;
    }
    #onInterval() {
        if (this.#intervalCount === 0 && this.#pending === 0 && this.#intervalId) {
            clearInterval(this.#intervalId);
            this.#intervalId = undefined;
        }
        this.#intervalCount = this.#carryoverConcurrencyCount ? this.#pending : 0;
        this.#processQueue();
    }
    /**
    Executes all queued functions until it reaches the limit.
    */
    #processQueue() {
        // eslint-disable-next-line no-empty
        while (this.#tryToStartAnother()) { }
    }
    get concurrency() {
        return this.#concurrency;
    }
    set concurrency(newConcurrency) {
        if (!(typeof newConcurrency === 'number' && newConcurrency >= 1)) {
            throw new TypeError(`Expected \`concurrency\` to be a number from 1 and up, got \`${newConcurrency}\` (${typeof newConcurrency})`);
        }
        this.#concurrency = newConcurrency;
        this.#processQueue();
    }
    async #throwOnAbort(signal) {
        return new Promise((_resolve, reject) => {
            signal.addEventListener('abort', () => {
                reject(signal.reason);
            }, { once: true });
        });
    }
    /**
    Updates the priority of a promise function by its id, affecting its execution order. Requires a defined concurrency limit to take effect.

    For example, this can be used to prioritize a promise function to run earlier.

    ```js
    import PQueue from 'p-queue';

    const queue = new PQueue({concurrency: 1});

    queue.add(async () => '🦄', {priority: 1});
    queue.add(async () => '🦀', {priority: 0, id: '🦀'});
    queue.add(async () => '🦄', {priority: 1});
    queue.add(async () => '🦄', {priority: 1});

    queue.setPriority('🦀', 2);
    ```

    In this case, the promise function with `id: '🦀'` runs second.

    You can also deprioritize a promise function to delay its execution:

    ```js
    import PQueue from 'p-queue';

    const queue = new PQueue({concurrency: 1});

    queue.add(async () => '🦄', {priority: 1});
    queue.add(async () => '🦀', {priority: 1, id: '🦀'});
    queue.add(async () => '🦄');
    queue.add(async () => '🦄', {priority: 0});

    queue.setPriority('🦀', -1);
    ```
    Here, the promise function with `id: '🦀'` executes last.
    */
    setPriority(id, priority) {
        this.#queue.setPriority(id, priority);
    }
    async add(function_, options = {}) {
        // In case `id` is not defined.
        options.id ??= (this.#idAssigner++).toString();
        options = {
            timeout: this.timeout,
            throwOnTimeout: this.#throwOnTimeout,
            ...options,
        };
        return new Promise((resolve, reject) => {
            this.#queue.enqueue(async () => {
                this.#pending++;
                this.#intervalCount++;
                try {
                    options.signal?.throwIfAborted();
                    let operation = function_({ signal: options.signal });
                    if (options.timeout) {
                        operation = pTimeout(Promise.resolve(operation), { milliseconds: options.timeout });
                    }
                    if (options.signal) {
                        operation = Promise.race([operation, this.#throwOnAbort(options.signal)]);
                    }
                    const result = await operation;
                    resolve(result);
                    this.emit('completed', result);
                }
                catch (error) {
                    if (error instanceof TimeoutError && !options.throwOnTimeout) {
                        resolve();
                        return;
                    }
                    reject(error);
                    this.emit('error', error);
                }
                finally {
                    this.#next();
                }
            }, options);
            this.emit('add');
            this.#tryToStartAnother();
        });
    }
    async addAll(functions, options) {
        return Promise.all(functions.map(async (function_) => this.add(function_, options)));
    }
    /**
    Start (or resume) executing enqueued tasks within concurrency limit. No need to call this if queue is not paused (via `options.autoStart = false` or by `.pause()` method.)
    */
    start() {
        if (!this.#isPaused) {
            return this;
        }
        this.#isPaused = false;
        this.#processQueue();
        return this;
    }
    /**
    Put queue execution on hold.
    */
    pause() {
        this.#isPaused = true;
    }
    /**
    Clear the queue.
    */
    clear() {
        this.#queue = new this.#queueClass();
    }
    /**
    Can be called multiple times. Useful if you for example add additional items at a later time.

    @returns A promise that settles when the queue becomes empty.
    */
    async onEmpty() {
        // Instantly resolve if the queue is empty
        if (this.#queue.size === 0) {
            return;
        }
        await this.#onEvent('empty');
    }
    /**
    @returns A promise that settles when the queue size is less than the given limit: `queue.size < limit`.

    If you want to avoid having the queue grow beyond a certain size you can `await queue.onSizeLessThan()` before adding a new item.

    Note that this only limits the number of items waiting to start. There could still be up to `concurrency` jobs already running that this call does not include in its calculation.
    */
    async onSizeLessThan(limit) {
        // Instantly resolve if the queue is empty.
        if (this.#queue.size < limit) {
            return;
        }
        await this.#onEvent('next', () => this.#queue.size < limit);
    }
    /**
    The difference with `.onEmpty` is that `.onIdle` guarantees that all work from the queue has finished. `.onEmpty` merely signals that the queue is empty, but it could mean that some promises haven't completed yet.

    @returns A promise that settles when the queue becomes empty, and all promises have completed; `queue.size === 0 && queue.pending === 0`.
    */
    async onIdle() {
        // Instantly resolve if none pending and if nothing else is queued
        if (this.#pending === 0 && this.#queue.size === 0) {
            return;
        }
        await this.#onEvent('idle');
    }
    async #onEvent(event, filter) {
        return new Promise(resolve => {
            const listener = () => {
                if (filter && !filter()) {
                    return;
                }
                this.off(event, listener);
                resolve();
            };
            this.on(event, listener);
        });
    }
    /**
    Size of the queue, the number of queued items waiting to run.
    */
    get size() {
        return this.#queue.size;
    }
    /**
    Size of the queue, filtered by the given options.

    For example, this can be used to find the number of items remaining in the queue with a specific priority level.
    */
    sizeBy(options) {
        // eslint-disable-next-line unicorn/no-array-callback-reference
        return this.#queue.filter(options).length;
    }
    /**
    Number of running items (no longer in the queue).
    */
    get pending() {
        return this.#pending;
    }
    /**
    Whether the queue is currently paused.
    */
    get isPaused() {
        return this.#isPaused;
    }
}

module.exports = PQueue;