evnty/build/index.cjs.map

0-Deps, simple, fast, for browser and node js reactive anonymous event library

{"version":3,"sources":["../src/index.ts"],"sourcesContent":["import { MaybePromise, Callback, Listener, FilterFunction, Predicate, Filter, Mapper, AsyncGenerable, Reducer, Expander } from './types.js';\nimport { Callable } from './callable.js';\nimport { Sequence } from './sequence.js';\n\nexport * from './types.js';\nexport * from './callable.js';\nexport * from './signal.js';\nexport * from './sequence.js';\n\n/**\n * Removes a listener from the provided array of listeners. It searches for the listener and removes all instances of it from the array.\n * This method ensures that the listener is fully unregistered, preventing any residual calls to a potentially deprecated handler.\n *\n * @internal\n * @param {unknown[]} listeners - The array of listeners from which to remove the listener.\n * @param {unknown} listener - The listener function to remove from the list of listeners.\n * @returns {boolean} - Returns `true` if the listener was found and removed, `false` otherwise.\n *\n * @template T - The type of the event that listeners are associated with.\n * @template R - The type of the return value that listeners are expected to return.\n *\n * ```typescript\n * // Assuming an array of listeners for click events\n * const listeners = [onClickHandler1, onClickHandler2];\n * const wasRemoved = removeListener(listeners, onClickHandler1);\n * console.log(wasRemoved); // Output: true\n * ```\n */\nexport const removeListener = (listeners: unknown[], listener: unknown): boolean => {\n  let index = listeners.indexOf(listener);\n  const wasRemoved = index !== -1;\n  while (~index) {\n    listeners.splice(index, 1);\n    index = listeners.indexOf(listener);\n  }\n  return wasRemoved;\n};\n\n/**\n * @internal\n * Creates a promise that resolves after a specified timeout. If an `AbortSignal` is provided and triggered,\n * the timeout is cleared, and the promise resolves to `false`.\n *\n * @param {number} timeout - The time in milliseconds to wait before resolving the promise.\n * @param {AbortSignal} [signal] - An optional `AbortSignal` that can abort the timeout.\n * @returns {Promise<boolean>} A promise that resolves to `true` if the timeout completed, or `false` if it was aborted.\n *\n * @example\n * ```typescript\n * const controller = new AbortController();\n * setTimeout(() => controller.abort(), 500);\n * const result = await setTimeoutAsync(1000, controller.signal);\n * console.log(result); // false\n * ```\n */\nexport const setTimeoutAsync = (timeout: number, signal?: AbortSignal): Promise<boolean> =>\n  new Promise<boolean>((resolve) => {\n    const timerId = setTimeout(resolve, timeout, true);\n    signal?.addEventListener('abort', () => {\n      clearTimeout(timerId);\n      resolve(false);\n    });\n  });\n\n/*\n * @internal\n */\nexport interface AsyncIterableCombinators<T> {\n  filter<U extends T>(filter: Filter<T, U>): AsyncIterableCombinators<Awaited<U>>;\n  map<U>(mapper: Mapper<T, U>): AsyncIterableCombinators<Awaited<U>>;\n  reduce<U>(reducer: Reducer<T, U>): AsyncIterableCombinators<Awaited<U>>;\n  expand<U>(expander: Mapper<T, U[]>): AsyncIterableCombinators<Awaited<U>>;\n  pipe<U>(expander: AsyncGenerable<T, U>): AsyncIterableCombinators<Awaited<U>>;\n}\n\n/*\n * @internal\n */\nexport interface EventSource<T> extends Callable<[T], boolean>, Promise<T>, AsyncIterable<T> {\n  next(): Promise<T>;\n}\n\n/**\n * @internal\n */\n\n/**\n * @internal\n */\nexport class Unsubscribe extends Callable<[], MaybePromise<void>> {\n  private _done = false;\n\n  constructor(callback: Callback) {\n    super(async () => {\n      this._done = true;\n      await callback();\n    });\n  }\n\n  get done() {\n    return this._done;\n  }\n\n  pre(callback: Callback): Unsubscribe {\n    return new Unsubscribe(async () => {\n      await callback();\n      await this();\n    });\n  }\n\n  post(callback: Callback): Unsubscribe {\n    return new Unsubscribe(async () => {\n      await this();\n      await callback();\n    });\n  }\n\n  countdown(count: number): Unsubscribe {\n    return new Unsubscribe(async () => {\n      if (!--count) {\n        await this();\n      }\n    });\n  }\n}\n\nenum HookType {\n  Add,\n  Remove,\n}\n\n/**\n * A class representing an anonymous event that can be listened to or triggered.\n *\n * @template T - The event type.\n * @template R - The return type of the event.\n */\nexport class Event<T = unknown, R = unknown> extends Callable<[T], Promise<(void | Awaited<R>)[]>> implements AsyncIterable<T>, PromiseLike<T> {\n  /**\n   * The array of listeners for the event.\n   */\n  private listeners: Listener<T, R>[];\n\n  private hooks: Array<(listener: Listener<T, R> | void, type: HookType) => void> = [];\n\n  private _disposed = false;\n\n  /**\n   * A function that disposes of the event and its listeners.\n   */\n  readonly dispose: Callback;\n\n  /**\n   * Creates a new event.\n   *\n   * @param dispose - A function to call on the event disposal.\n   *\n   * ```typescript\n   * // Create a click event.\n   * const clickEvent = new Event<[x: number, y: number], void>();\n   * clickEvent.on(([x, y]) => console.log(`Clicked at ${x}, ${y}`));\n   * ```\n   */\n  constructor(dispose?: Callback) {\n    const listeners: Listener<T, R>[] = [];\n    // passes listeners exceptions to catch method\n    super((value: T): Promise<(void | Awaited<R>)[]> => Promise.all(listeners.map(async (listener) => listener(await value))));\n\n    this.listeners = listeners;\n\n    this.dispose = () => {\n      this._disposed = true;\n      void this.clear();\n      void this._error?.dispose();\n      void dispose?.();\n    };\n  }\n\n  private _error?: Event<unknown>;\n\n  /**\n   * Error event that emits errors.\n   *\n   * @returns {Event<unknown>} The error event.\n   */\n  get error(): Event<unknown> {\n    return (this._error ??= new Event<unknown>());\n  }\n\n  /**\n   * The number of listeners for the event.\n   *\n   * @readonly\n   * @type {number}\n   */\n  get size(): number {\n    return this.listeners.length;\n  }\n\n  /**\n   * Checks if the event has been disposed.\n   * @returns {boolean} `true` if the event has been disposed; otherwise, `false`.\n   */\n  get disposed(): boolean {\n    return this._disposed;\n  }\n\n  /**\n   * Checks if the given listener is NOT registered for this event.\n   *\n   * @param listener - The listener function to check against the registered listeners.\n   * @returns `true` if the listener is not already registered; otherwise, `false`.\n   *\n   * ```typescript\n   * // Check if a listener is not already added\n   * if (event.lacks(myListener)) {\n   *   event.on(myListener);\n   * }\n   * ```\n   */\n  lacks(listener: Listener<T, R>): boolean {\n    return this.listeners.indexOf(listener) === -1;\n  }\n\n  /**\n   * Checks if the given listener is registered for this event.\n   *\n   * @param listener - The listener function to check.\n   * @returns `true` if the listener is currently registered; otherwise, `false`.\n   *\n   * ```typescript\n   * // Verify if a listener is registered\n   * if (event.has(myListener)) {\n   *   console.log('Listener is already registered');\n   * }\n   * ```\n   */\n  has(listener: Listener<T, R>): boolean {\n    return this.listeners.indexOf(listener) !== -1;\n  }\n\n  /**\n   * Removes a specific listener from this event.\n   *\n   * @param listener - The listener to remove.\n   * @returns The event instance, allowing for method chaining.\n   *\n   * ```typescript\n   * // Remove a listener\n   * event.off(myListener);\n   * ```\n   */\n  off(listener: Listener<T, R>): this {\n    if (removeListener(this.listeners, listener) && this.hooks.length) {\n      [...this.hooks].forEach((spy) => spy(listener, HookType.Remove));\n    }\n    return this;\n  }\n\n  /**\n   * Registers a listener that gets triggered whenever the event is emitted.\n   * This is the primary method for adding event handlers that will react to the event being triggered.\n   *\n   * @param listener - The function to call when the event occurs.\n   * @returns An object that can be used to unsubscribe the listener, ensuring easy cleanup.\n   *\n   * ```typescript\n   * // Add a listener to an event\n   * const unsubscribe = event.on((data) => {\n   *   console.log('Event data:', data);\n   * });\n   * ```\n   */\n  on(listener: Listener<T, R>): Unsubscribe {\n    this.listeners.push(listener);\n    if (this.hooks.length) {\n      [...this.hooks].forEach((spy) => spy(listener, HookType.Add));\n    }\n    return new Unsubscribe(() => {\n      void this.off(listener);\n    });\n  }\n\n  /**\n   * Adds a listener that will be called only once the next time the event is emitted.\n   * This method is useful for one-time notifications or single-trigger scenarios.\n   *\n   * @param listener - The listener to trigger once.\n   * @returns An object that can be used to remove the listener if the event has not yet occurred.\n   *\n   * ```typescript\n   * // Register a one-time listener\n   * const onceUnsubscribe = event.once((data) => {\n   *   console.log('Received data once:', data);\n   * });\n   * ```\n   */\n  once(listener: Listener<T, R>): Unsubscribe {\n    const oneTimeListener = (event: T) => {\n      void this.off(oneTimeListener);\n      return listener(event);\n    };\n    return this.on(oneTimeListener);\n  }\n\n  /**\n   * Removes all listeners from the event, effectively resetting it. This is useful when you need to\n   * cleanly dispose of all event handlers to prevent memory leaks or unwanted triggers after certain conditions.\n   *\n   * @returns {this} The instance of the event, allowing for method chaining.\n   *\n   * ```typescript\n   * const myEvent = new Event();\n   * myEvent.on(data => console.log(data));\n   * myEvent.clear(); // Clears all listeners\n   * ```\n   */\n  clear(): this {\n    this.listeners.splice(0);\n    if (this.hooks.length) {\n      [...this.hooks].forEach((spy) => spy(undefined, HookType.Remove));\n    }\n    return this;\n  }\n\n  /**\n   * Enables the `Event` to be used in a Promise chain, resolving with the first emitted value.\n   *\n   * @template OK - The type of the fulfilled value returned by `onfulfilled` (defaults to the event's type).\n   * @template ERR - The type of the rejected value returned by `onrejected` (defaults to `never`).\n   * @param onfulfilled - A function called when the event emits its first value.\n   * @param onrejected - A function called if an error occurs before the event emits.\n   * @returns A Promise that resolves with the result of `onfulfilled` or `onrejected`.\n   *\n   * ```typescript\n   * const clickEvent = new Event<[number, number]>();\n   * await clickEvent;\n   * ```\n   */\n  then<OK = T, ERR = never>(\n    onfulfilled?: ((value: T) => OK | PromiseLike<OK>) | null,\n    onrejected?: ((reason: unknown) => ERR | PromiseLike<ERR>) | null,\n  ): Promise<OK | ERR> {\n    const subscribers: Unsubscribe[] = [];\n    const promise = new Promise<T>((resolve, reject) => {\n      subscribers.push(this.once(resolve));\n      subscribers.push(this.error.once(reject));\n    });\n\n    const unsubscribe = async <U>(value: U) => {\n      await Promise.all(subscribers.map((u) => u()));\n      return value;\n    };\n\n    return promise\n      .then(onfulfilled, onrejected)\n      .then(unsubscribe)\n      .catch(async (error) => {\n        throw await unsubscribe(error);\n      });\n  }\n\n  /**\n   * Waits for the event to settle, returning a `PromiseSettledResult`.\n   *\n   * @returns {Promise<PromiseSettledResult<T>>} A promise that resolves with the settled result.\n   *\n   * @example\n   * ```typescript\n   * const result = await event.settle();\n   * if (result.status === 'fulfilled') {\n   *   console.log('Event fulfilled with value:', result.value);\n   * } else {\n   *   console.error('Event rejected with reason:', result.reason);\n   * }\n   * ```\n   */\n  async settle(): Promise<PromiseSettledResult<T>> {\n    return await Promise.allSettled([this.promise]).then(([settled]) => settled);\n  }\n\n  /**\n   * A promise that resolves with the first emitted value from this event.\n   *\n   * @returns {Promise<T>} The promise value.\n   */\n  get promise(): Promise<T> {\n    return this.then();\n  }\n\n  /**\n   * Makes this event iterable using `for await...of` loops.\n   *\n   * @returns An async iterator that yields values as they are emitted by this event.\n   *\n   * ```typescript\n   * // Assuming an event that emits numbers\n   * const numberEvent = new Event<number>();\n   * (async () => {\n   *   for await (const num of numberEvent) {\n   *     console.log('Number:', num);\n   *   }\n   * })();\n   * await numberEvent(1);\n   * await numberEvent(2);\n   * await numberEvent(3);\n   * ```\n   */\n  [Symbol.asyncIterator](): AsyncIterator<T> {\n    const ctrl = new AbortController();\n    const sequence = new Sequence<T>(ctrl.signal);\n    const emitEvent = (value: T) => {\n      sequence(value);\n    };\n    const unsubscribe = this.on(emitEvent).pre(() => {\n      ctrl.abort('done');\n    });\n\n    const spy: (typeof this.hooks)[number] = (target = emitEvent, action) => {\n      if (target === emitEvent && action === HookType.Remove) {\n        void unsubscribe();\n      }\n    };\n\n    this.hooks.push(spy);\n    return sequence[Symbol.asyncIterator]();\n  }\n\n  /**\n   * Transforms the event's values using a generator function, creating a new `Event` that emits the transformed values.\n   *\n   * @template PT - The type of values emitted by the transformed `Event`.\n   * @template PR - The return type of the listeners of the transformed `Event`.\n   * @param generator - A function that takes the original event's value and returns a generator (sync or async) that yields the transformed values.\n   * @returns A new `Event` instance that emits the transformed values.\n   *\n   * ```typescript\n   * const numbersEvent = new Event<number>();\n   * const evenNumbersEvent = numbersEvent.pipe(function*(value) {\n   *    if (value % 2 === 0) {\n   *      yield value;\n   *    }\n   * });\n   * evenNumbersEvent.on((evenNumber) => console.log(evenNumber));\n   * await numbersEvent(1);\n   * await numbersEvent(2);\n   * await numbersEvent(3);\n   * ```\n   */\n  pipe<PT, R>(generator: (event: T) => AsyncGenerator<PT, void, unknown> | Generator<PT, void, unknown>): Event<PT, R> {\n    const emitEvent = async (value: T) => {\n      try {\n        for await (const generatedValue of generator(value)) {\n          await result(generatedValue).catch(result.error);\n        }\n      } catch (e) {\n        await result.error(e);\n      }\n    };\n\n    const unsubscribe = this.on(emitEvent).pre(() => {\n      removeListener(this.hooks, hook);\n    });\n\n    const hook: (typeof this.hooks)[number] = (target = emitEvent, action) => {\n      if (target === emitEvent && action === HookType.Remove) {\n        void unsubscribe();\n      }\n    };\n    this.hooks.push(hook);\n\n    const result = new Event<PT, R>(unsubscribe);\n    return result;\n  }\n\n  /**\n   * Creates an async generator that yields values as they are emitted by this event.\n   *\n   * @template PT - The type of values yielded by the async generator.\n   * @param generator - An optional function that takes the original event's value and returns a generator (sync or async)\n   *                  that yields values to include in the async generator.\n   * @returns An async generator that yields values from this event as they occur.\n   *\n   * ```typescript\n   * const numbersEvent = new Event<number>();\n   * const evenNumbersEvent = numbersEvent.pipe(function*(value) {\n   *    if (value % 2 === 0) {\n   *      yield value;\n   *    }\n   * });\n   * evenNumbersEvent.on((evenNumber) => console.log(evenNumber));\n   * await numbersEvent(1);\n   * await numbersEvent(2);\n   * await numbersEvent(3);\n   * ```\n   */\n  async *generator<PT>(generator: (event: T) => AsyncGenerator<PT, void, unknown> | Generator<PT, void, unknown>): AsyncGenerator<Awaited<PT>, void, unknown> {\n    for await (const value of this.pipe(generator)) {\n      yield value;\n    }\n  }\n\n  /**\n   * Filters events, creating a new event that only triggers when the provided filter function returns `true`.\n   * This method can be used to selectively process events that meet certain criteria.\n   *\n   * @param {Filter<T, P>} predicate The filter function or predicate to apply to each event.\n   * @returns {Event<P, R>} A new event that only triggers for filtered events.\n   *\n   * ```typescript\n   * const keyPressedEvent = new Event<string>();\n   * const enterPressedEvent = keyPressedEvent.filter(key => key === 'Enter');\n   * enterPressedEvent.on(() => console.log('Enter key was pressed.'));\n   * ```\n   */\n  filter<P extends T>(predicate: Predicate<T, P>): Event<P, R>;\n  filter<P extends T>(filter: FilterFunction<T>): Event<P, R>;\n  filter<P extends T>(filter: Filter<T, P>): Event<P, R> {\n    return this.pipe<P, R>(async function* (value: T) {\n      if (await filter(value)) {\n        yield value as P;\n      }\n    });\n  }\n\n  /**\n   * Creates a new event that will only be triggered once when the provided filter function returns `true`.\n   * This method is useful for handling one-time conditions in a stream of events.\n   *\n   * @param {Filter<T, P>} predicate - The filter function or predicate.\n   * @returns {Event<P, R>} A new event that will be triggered only once when the filter condition is met.\n   *\n   * ```typescript\n   * const sizeChangeEvent = new Event<number>();\n   * const sizeReachedEvent = sizeChangeEvent.first(size => size > 1024);\n   * sizeReachedEvent.on(() => console.log('Size threshold exceeded.'));\n   * ```\n   */\n  first<P extends T>(predicate: Predicate<T, P>): Event<P, R>;\n  first<P extends T>(filter: FilterFunction<T>): Event<P, R>;\n  first<P extends T>(filter: Filter<T, P>): Event<P, R> {\n    const filteredEvent = this.pipe<P, R>(async function* (value: T) {\n      if (await filter(value)) {\n        yield value as P;\n        await filteredEvent.dispose();\n      }\n    });\n    return filteredEvent;\n  }\n\n  /**\n   * Transforms the data emitted by this event using a mapping function. Each emitted event is processed by the `mapper`\n   * function, which returns a new value that is then emitted by the returned `Event` instance. This is useful for data transformation\n   * or adapting the event's data structure.\n   *\n   * @template M The type of data that the mapper function will produce.\n   * @template MR The type of data emitted by the mapped event, usually related to or the same as `M`.\n   * @param {Mapper<T, M>} mapper A function that takes the original event data and returns the transformed data.\n   * @returns {Event<M, MR>} A new `Event` instance that emits the mapped values.\n   *\n   * ```typescript\n   * // Assuming an event that emits numbers, create a new event that emits their squares.\n   * const numberEvent = new Event<number>();\n   * const squaredEvent = numberEvent.map(num => num * num);\n   * squaredEvent.on(squared => console.log('Squared number:', squared));\n   * await numberEvent(5); // Logs: \"Squared number: 25\"\n   * ```\n   */\n  map<M, MR = R>(mapper: Mapper<T, M>): Event<Awaited<M>, MR> {\n    return this.pipe(async function* (value) {\n      yield await mapper(value);\n    });\n  }\n\n  /**\n   * Accumulates the values emitted by this event using a reducer function, starting from an initial value. The reducer\n   * function takes the accumulated value and the latest emitted event data, then returns a new accumulated value. This\n   * new value is then emitted by the returned `Event` instance. This is particularly useful for accumulating state over time.\n   *\n   * @template A The type of the accumulator value.\n   * @template AR The type of data emitted by the reduced event, usually the same as `A`.\n   * @param {Reducer<T, A>} reducer A function that takes the current accumulated value and the new event data, returning the new accumulated value.\n   * @param {A} init The initial value of the accumulator.\n   * @returns {Event<A, AR>} A new `Event` instance that emits the reduced value.\n   *\n   * ```typescript\n   * const sumEvent = numberEvent.reduce((a, b) => a + b, 0);\n   * sumEvent.on((sum) => console.log(sum)); // 1, 3, 6\n   * await sumEvent(1);\n   * await sumEvent(2);\n   * await sumEvent(3);\n   * ```\n   */\n  reduce<A, AR = R>(reducer: Reducer<T, A>, init?: A): Event<Awaited<A>, AR>;\n  reduce<A, AR = R>(reducer: Reducer<T, A>, ...init: unknown[]): Event<Awaited<A>, AR> {\n    let hasInit = init.length === 1;\n    let result = init[0] as A | undefined;\n\n    return this.pipe(async function* (value) {\n      if (hasInit) {\n        result = await reducer(result!, value);\n        yield result;\n      } else {\n        result = value as unknown as A;\n        hasInit = true;\n      }\n    });\n  }\n\n  /**\n   * Transforms each event's data into multiple events using an expander function. The expander function takes\n   * the original event's data and returns an array of new data elements, each of which will be emitted individually\n   * by the returned `Event` instance. This method is useful for scenarios where an event's data can naturally\n   * be expanded into multiple, separate pieces of data which should each trigger further processing independently.\n   *\n   * @template ET - The type of data elements in the array returned by the expander function.\n   * @template ER - The type of responses emitted by the expanded event, usually related to or the same as `ET`.\n   * @param {Expander<T, ET[]>} expander - A function that takes the original event data and returns an array of new data elements.\n   * @returns {Event<ET, ER>} - A new `Event` instance that emits each value from the array returned by the expander function.\n   *\n   * ```typescript\n   * // Assuming an event that emits a sentence, create a new event that emits each word from the sentence separately.\n   * const sentenceEvent = new Event<string>();\n   * const wordEvent = sentenceEvent.expand(sentence => sentence.split(' '));\n   * wordEvent.on(word => console.log('Word:', word));\n   * await sentenceEvent('Hello world'); // Logs: \"Word: Hello\", \"Word: world\"\n   * ```\n   */\n  expand<ET, ER>(expander: Expander<T, ET[]>): Event<Awaited<ET>, ER> {\n    return this.pipe(async function* (value) {\n      const values = await expander(value);\n      for (const value of values) {\n        yield value;\n      }\n    });\n  }\n\n  /**\n   * Creates a new event that emits values based on a conductor event. The orchestrated event will emit the last value\n   * captured from the original event each time the conductor event is triggered.\n   *\n   * @template T The type of data emitted by the original event.\n   * @template R The type of data emitted by the orchestrated event, usually the same as `T`.\n   * @param {Event<unknown, unknown>} conductor The event that triggers the emission of the last captured value.\n   * @returns {Event<T, R>} A new event that emits values based on the conductor's triggers.\n   *\n   * ```typescript\n   * const rightClickPositionEvent = mouseMoveEvent.orchestrate(mouseRightClickEvent);\n   * ```\n   *\n   * ```typescript\n   * // An event that emits whenever a \"tick\" event occurs.\n   * const tickEvent = new Event<void>();\n   * const dataEvent = new Event<string>();\n   * const synchronizedEvent = dataEvent.orchestrate(tickEvent);\n   * synchronizedEvent.on(data => console.log('Data on tick:', data));\n   * await dataEvent('Hello');\n   * await dataEvent('World!');\n   * await tickEvent(); // Logs: \"Data on tick: World!\"\n   * ```\n   */\n  orchestrate<CT, CR>(conductor: Event<CT, CR>): Event<T, R> {\n    let initialized = false;\n    let lastValue: T;\n    const unsubscribe = this.on((event) => {\n      initialized = true;\n      lastValue = event;\n    });\n    const unsubscribeConductor = conductor.on(async () => {\n      if (initialized) {\n        await orchestratedEvent(lastValue);\n        initialized = false;\n      }\n    });\n\n    const orchestratedEvent = new Event<T, R>(unsubscribe.post(unsubscribeConductor));\n\n    return orchestratedEvent;\n  }\n  /**\n   * Creates a debounced event that delays triggering until after a specified interval has elapsed\n   * following the last time it was invoked. This method is particularly useful for limiting the rate\n   * at which a function is executed. Common use cases include handling rapid user inputs, window resizing,\n   * or scroll events.\n   *\n   * @param {number} interval - The amount of time to wait (in milliseconds) before firing the debounced event.\n   * @returns {Event<T, R>} An event of debounced events.\n   *\n   * ```typescript\n   * const debouncedEvent = textInputEvent.debounce(100);\n   * debouncedEvent.on((str) => console.log(str)); // only 'text' is emitted\n   * await event('t');\n   * await event('te');\n   * await event('tex');\n   * await event('text');\n   * ```\n   */\n  debounce(interval: number): Event<Awaited<T>, unknown> {\n    let controller = new AbortController();\n\n    return this.pipe(async function* (value) {\n      controller.abort();\n      controller = new AbortController();\n      const complete = await setTimeoutAsync(interval, controller.signal);\n      if (complete) {\n        yield value;\n      }\n    });\n  }\n\n  /**\n   * Creates a throttled event that emits values at most once per specified interval.\n   *\n   * This is useful for controlling the rate of event emissions, especially for high-frequency events.\n   * The throttled event will immediately emit the first value, and then only emit subsequent values\n   * if the specified interval has passed since the last emission.\n   *\n   * @param interval - The time interval (in milliseconds) between allowed emissions.\n   * @returns A new Event that emits throttled values.\n   *\n   * ```typescript\n   * const scrollEvent = new Event();\n   * const throttledScroll = scrollEvent.throttle(100); // Emit at most every 100ms\n   * throttledScroll.on(() => console.log(\"Throttled scroll event\"));\n   * ```\n   */\n  throttle(interval: number): Event<Awaited<T>, unknown> {\n    let timeout = 0;\n    let pendingValue: T;\n    let hasPendingValue = false;\n\n    return this.pipe(async function* (value) {\n      const now = Date.now();\n      if (timeout <= now) {\n        timeout = now + interval;\n        yield value;\n      } else {\n        pendingValue = value;\n        if (!hasPendingValue) {\n          hasPendingValue = true;\n          await setTimeoutAsync(timeout - now);\n          timeout = now + interval;\n          hasPendingValue = false;\n          yield pendingValue;\n        }\n      }\n    });\n  }\n\n  /**\n   * Aggregates multiple event emissions into batches and emits the batched events either at specified\n   * time intervals or when the batch reaches a predefined size. This method is useful for grouping\n   * a high volume of events into manageable chunks, such as logging or processing data in bulk.\n   *\n   * @param {number} interval - The time in milliseconds between batch emissions.\n   * @param {number} [size] - Optional. The maximum size of each batch. 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The 'pop' method retrieves the next element from the queue, while 'stop' halts further processing.\n   *\n   * ```typescript\n   * // Queueing tasks for sequential execution\n   * const taskEvent = new Event<string>();\n   * const taskQueue = taskEvent.queue();\n   * (async () => {\n   *   console.log('Processing:', await taskQueue.pop()); // Processing: Task 1\n   *   // Queue also can be used as a Promise\n   *   console.log('Processing:', await taskQueue); // Processing: Task 2\n   * })();\n   * await taskEvent('Task 1');\n   * await taskEvent('Task 2');\n   *```\n   *\n   *```typescript\n   * // Additionally, the queue can be used as an async iterator\n   * const taskEvent = new Event<string>();\n   * const taskQueue = taskEvent.queue();\n   * (async () => {\n   *   for await (const task of taskQueue) {\n   *     console.log('Processing:', task);\n   *   }\n   * })();\n   * await taskEvent('Task 1');\n   * await taskEvent('Task 2');\n   * ```\n   *\n   */\n  queue(): Queue<T> {\n    const ctrl = new AbortController();\n    const sequence = new Sequence<T>(ctrl.signal);\n    const onEvent = (value: T) => {\n      sequence(value);\n    };\n    const unsubscribe = this.on(onEvent).pre(() => {\n      ctrl.abort('done');\n    });\n\n    const pop = async () => await sequence;\n\n    return {\n      pop,\n      stop: async () => {\n        await unsubscribe();\n      },\n      get stopped() {\n        return ctrl.signal.aborted;\n      },\n      then<TResult1 = T, TResult2 = never>(\n        onfulfilled?: ((value: T) => TResult1 | PromiseLike<TResult1>) | null,\n        onrejected?: ((reason: unknown) => TResult2 | PromiseLike<TResult2>) | null,\n      ): Promise<TResult1 | TResult2> {\n        return pop().then(onfulfilled, onrejected);\n      },\n      [Symbol.asyncIterator]() {\n        return {\n          next: async () => {\n            try {\n              const value = await pop();\n              return { value, done: false };\n            } catch {\n              return { value: undefined, done: true };\n            }\n          },\n        };\n      },\n    };\n  }\n}\n\nexport interface Queue<T> extends AsyncIterable<T>, PromiseLike<T> {\n  pop(): Promise<T>;\n  stop(): Promise<void>;\n  stopped: boolean;\n}\n\nexport type EventParameters<T> = T extends Event<infer P, any> ? P : never;\n\nexport type EventResult<T> = T extends Event<any, infer R> ? R : never;\n\nexport type AllEventsParameters<T extends Event<any, any>[]> = { [K in keyof T]: EventParameters<T[K]> }[number];\n\nexport type AllEventsResults<T extends Event<any, any>[]> = { [K in keyof T]: EventResult<T[K]> }[number];\n\n/**\n * Merges multiple events into a single event. This function takes any number of `Event` instances\n * and returns a new `Event` that triggers whenever any of the input events trigger. The parameters\n * and results of the merged event are derived from the input events, providing a flexible way to\n * handle multiple sources of events in a unified manner.\n *\n * @template Events - An array of `Event` instances.\n * @param {...Events} events - A rest parameter that takes multiple events to be merged.\n * @returns {Event<AllEventsParameters<Events>, AllEventsResults<Events>>} - Returns a new `Event` instance\n *           that triggers with the parameters and results of any of the merged input events.\n *\n * ```typescript\n * // Merging mouse and keyboard events into a single event\n * const mouseEvent = createEvent<MouseEvent>();\n * const keyboardEvent = createEvent<KeyboardEvent>();\n * const inputEvent = merge(mouseEvent, keyboardEvent);\n * inputEvent.on(event => console.log('Input event:', event));\n * ```\n */\nexport const merge = <Events extends Event<any, any>[]>(...events: Events): Event<AllEventsParameters<Events>, AllEventsResults<Events>> => {\n  const mergedEvent = new Event<AllEventsParameters<Events>, AllEventsResults<Events>>();\n  events.forEach((event) => event.on(mergedEvent));\n  return mergedEvent;\n};\n\n/**\n * Creates a periodic event that triggers at a specified interval. 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This function is useful\n * for creating time-based triggers within an application, such as updating UI elements, polling,\n * or any other timed operation.\n *\n * @template R - The return type of the event handler function, defaulting to `void`.\n * @param {number} interval - The interval in milliseconds at which the event should trigger.\n * @returns {Event<number, R>} - An `Event` instance that triggers at the specified interval,\n *           emitting an incrementing counter value.\n *\n * ```typescript\n * // Creating an interval event that logs a message every second\n * const tickEvent = createInterval(1000);\n * tickEvent.on(tickNumber => console.log('Tick:', tickNumber));\n * ```\n */\nexport const createInterval = <R = unknown>(interval: number): Event<number, R> => {\n  let counter = 0;\n  const intervalEvent = new Event<number, R>(() => clearInterval(timerId));\n  const timerId: ReturnType<typeof setInterval> = setInterval(() => {\n    void intervalEvent(counter++);\n  }, interval);\n  return intervalEvent;\n};\n\n/**\n * Creates a new instance of the `Event` class, which allows for the registration of event handlers that get called when the event is emitted.\n * This factory function simplifies the creation of events by encapsulating the instantiation logic, providing a clean and simple API for event creation.\n *\n * @typeParam T - The tuple of argument types that the event will accept.\n * @typeParam R - The return type of the event handler function, which is emitted after processing the event data.\n * @returns {Event<T, R>} - A new instance of the `Event` class, ready to have listeners added to it.\n *\n * ```typescript\n * // Create a new event that accepts a string and returns the string length\n * const myEvent = createEvent<string, number>();\n * myEvent.on((str: string) => str.length);\n * myEvent('hello').then(results => console.log(results)); // Logs: [5]\n * ```\n */\nexport const createEvent = <T = unknown, R = unknown>(): Event<T, R> => new Event<T, R>();\n\nexport default createEvent;\n\n/**\n * A type helper that extracts the event listener type\n *\n * @typeParam E - The event type.\n */\nexport type EventHandler<E> = E extends Event<infer T, infer R> ? 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