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const isArray = (() => Array.isArray || (<T>(x: any): x is T[] => x && typeof x.length === 'number'))();\n","export function isObject(x: any): x is Object {\n  return x !== null && typeof x === 'object';\n}\n","export const isArrayLike = (<T>(x: any): x is ArrayLike<T> => x && typeof x.length === 'number' && typeof x !== 'function');","import { Subscriber } from '../Subscriber';\n\n/**\n * Subscribes to an ArrayLike with a subscriber\n * @param array The array or array-like to subscribe to\n */\nexport const subscribeToArray = <T>(array: ArrayLike<T>) => (subscriber: Subscriber<T>) => {\n  for (let i = 0, len = array.length; i < len && !subscriber.closed; i++) {\n    subscriber.next(array[i]);\n  }\n  subscriber.complete();\n};\n","/**\n * Tests to see if the object is an ES2015 (ES6) Promise\n * @see {@link https://www.ecma-international.org/ecma-262/6.0/#sec-promise-objects}\n * @param value the object to test\n */\nexport function isPromise(value: any): value is PromiseLike<any> {\n  return !!value && typeof (<any>value).subscribe !== 'function' && typeof (value as any).then === 'function';\n}\n","import { SchedulerLike } from '../types';\n\nexport function isScheduler(value: any): value is SchedulerLike {\n  return value && typeof (<any>value).schedule === 'function';\n}\n","import { Observable } from '../Observable';\nimport { SchedulerLike } from '../types';\nimport { subscribeToArray } from '../util/subscribeToArray';\nimport { scheduleArray } from '../scheduled/scheduleArray';\n\nexport function fromArray<T>(input: ArrayLike<T>, scheduler?: SchedulerLike) {\n  if (!scheduler) {\n    return new Observable<T>(subscribeToArray(input));\n  } else {\n    return scheduleArray(input, scheduler);\n  }\n}\n","import { ObservableInput } from '../types';\nimport { subscribeToArray } from './subscribeToArray';\nimport { subscribeToPromise } from './subscribeToPromise';\nimport { subscribeToIterable } from './subscribeToIterable';\nimport { subscribeToObservable } from './subscribeToObservable';\nimport { isArrayLike } from './isArrayLike';\nimport { isPromise } from './isPromise';\nimport { isObject } from './isObject';\nimport { iterator as Symbol_iterator } from '../symbol/iterator';\nimport { observable as Symbol_observable } from '../symbol/observable';\nimport { Subscription } from '../Subscription';\nimport { Subscriber } from '../Subscriber';\n\nexport const subscribeTo = <T>(result: ObservableInput<T>): (subscriber: Subscriber<T>) => Subscription | void => {\n  if (!!result && typeof result[Symbol_observable] === 'function') {\n    return subscribeToObservable(result as any);\n  } else if (isArrayLike(result)) {\n    return subscribeToArray(result);\n  } else if (isPromise(result)) {\n    return subscribeToPromise(result as Promise<any>);\n  } else if (!!result && typeof result[Symbol_iterator] === 'function') {\n    return subscribeToIterable(result as any);\n  } else {\n    const value = isObject(result) ? 'an invalid object' : `'${result}'`;\n    const msg = `You provided ${value} where a stream was expected.`\n      + ' You can provide an Observable, Promise, Array, or Iterable.';\n    throw new TypeError(msg);\n  }\n};\n","import { Subscriber } from '../Subscriber';\nimport { observable as Symbol_observable } from '../symbol/observable';\n\n/**\n * Subscribes to an object that implements Symbol.observable with the given\n * Subscriber.\n * @param obj An object that implements Symbol.observable\n */\nexport const subscribeToObservable = <T>(obj: any) => (subscriber: Subscriber<T>) => {\n  const obs = obj[Symbol_observable]();\n  if (typeof obs.subscribe !== 'function') {\n    // Should be caught by observable subscribe function error handling.\n    throw new TypeError('Provided object does not correctly implement Symbol.observable');\n  } else {\n    return obs.subscribe(subscriber);\n  }\n};\n","import { Subscriber } from '../Subscriber';\nimport { hostReportError } from './hostReportError';\n\nexport const subscribeToPromise = <T>(promise: PromiseLike<T>) => (subscriber: Subscriber<T>) => {\n  promise.then(\n    (value) => {\n      if (!subscriber.closed) {\n        subscriber.next(value);\n        subscriber.complete();\n      }\n    },\n    (err: any) => subscriber.error(err)\n  )\n  .then(null, hostReportError);\n  return subscriber;\n};\n","import { Subscriber } from '../Subscriber';\nimport { iterator as Symbol_iterator } from '../symbol/iterator';\n\nexport const subscribeToIterable = <T>(iterable: Iterable<T>) => (subscriber: Subscriber<T>) => {\n  const iterator = iterable[Symbol_iterator]();\n  do {\n    const item = iterator.next();\n    if (item.done) {\n      subscriber.complete();\n      break;\n    }\n    subscriber.next(item.value);\n    if (subscriber.closed) {\n      break;\n    }\n  } while (true);\n\n  // Finalize the iterator if it happens to be a Generator\n  if (typeof iterator.return === 'function') {\n    subscriber.add(() => {\n      if (iterator.return) {\n        iterator.return();\n      }\n    });\n  }\n\n  return subscriber;\n};\n","import { Action } from './scheduler/Action';\nimport { Subscription } from './Subscription';\nimport { SchedulerLike, SchedulerAction } from './types';\n\n/**\n * An execution context and a data structure to order tasks and schedule their\n * execution. Provides a notion of (potentially virtual) time, through the\n * `now()` getter method.\n *\n * Each unit of work in a Scheduler is called an `Action`.\n *\n * ```ts\n * class Scheduler {\n *   now(): number;\n *   schedule(work, delay?, state?): Subscription;\n * }\n * ```\n *\n * @class Scheduler\n * @deprecated Scheduler is an internal implementation detail of RxJS, and\n * should not be used directly. Rather, create your own class and implement\n * {@link SchedulerLike}\n */\nexport class Scheduler implements SchedulerLike {\n\n  /**\n   * Note: the extra arrow function wrapper is to make testing by overriding\n   * Date.now easier.\n   * @nocollapse\n   */\n  public static now: () => number = () => Date.now();\n\n  constructor(private SchedulerAction: typeof Action,\n              now: () => number = Scheduler.now) {\n    this.now = now;\n  }\n\n  /**\n   * A getter method that returns a number representing the current time\n   * (at the time this function was called) according to the scheduler's own\n   * internal clock.\n   * @return {number} A number that represents the current time. May or may not\n   * have a relation to wall-clock time. May or may not refer to a time unit\n   * (e.g. milliseconds).\n   */\n  public now: () => number;\n\n  /**\n   * Schedules a function, `work`, for execution. May happen at some point in\n   * the future, according to the `delay` parameter, if specified. May be passed\n   * some context object, `state`, which will be passed to the `work` function.\n   *\n   * The given arguments will be processed an stored as an Action object in a\n   * queue of actions.\n   *\n   * @param {function(state: ?T): ?Subscription} work A function representing a\n   * task, or some unit of work to be executed by the Scheduler.\n   * @param {number} [delay] Time to wait before executing the work, where the\n   * time unit is implicit and defined by the Scheduler itself.\n   * @param {T} [state] Some contextual data that the `work` function uses when\n   * called by the Scheduler.\n   * @return {Subscription} A subscription in order to be able to unsubscribe\n   * the scheduled work.\n   */\n  public schedule<T>(work: (this: SchedulerAction<T>, state?: T) => void, delay: number = 0, state?: T): Subscription {\n    return new this.SchedulerAction<T>(this, work).schedule(state, delay);\n  }\n}\n","import { Scheduler } from '../Scheduler';\nimport { Action } from './Action';\nimport { AsyncAction } from './AsyncAction';\nimport { SchedulerAction } from '../types';\nimport { Subscription } from '../Subscription';\n\nexport class AsyncScheduler extends Scheduler {\n  public static delegate?: Scheduler;\n  public actions: Array<AsyncAction<any>> = [];\n  /**\n   * A flag to indicate whether the Scheduler is currently executing a batch of\n   * queued actions.\n   * @type {boolean}\n   * @deprecated internal use only\n   */\n  public active: boolean = false;\n  /**\n   * An internal ID used to track the latest asynchronous task such as those\n   * coming from `setTimeout`, `setInterval`, `requestAnimationFrame`, and\n   * others.\n   * @type {any}\n   * @deprecated internal use only\n   */\n  public scheduled: any = undefined;\n\n  constructor(SchedulerAction: typeof Action,\n              now: () => number = Scheduler.now) {\n    super(SchedulerAction, () => {\n      if (AsyncScheduler.delegate && AsyncScheduler.delegate !== this) {\n        return AsyncScheduler.delegate.now();\n      } else {\n        return now();\n      }\n    });\n  }\n\n  public schedule<T>(work: (this: SchedulerAction<T>, state?: T) => void, delay: number = 0, state?: T): Subscription {\n    if (AsyncScheduler.delegate && AsyncScheduler.delegate !== this) {\n      return AsyncScheduler.delegate.schedule(work, delay, state);\n    } else {\n      return super.schedule(work, delay, state);\n    }\n  }\n\n  public flush(action: AsyncAction<any>): void {\n\n    const {actions} = this;\n\n    if (this.active) {\n      actions.push(action);\n      return;\n    }\n\n    let error: any;\n    this.active = true;\n\n    do {\n      if (error = action.execute(action.state, action.delay)) {\n        break;\n      }\n    } while (action = actions.shift()); // exhaust the scheduler queue\n\n    this.active = false;\n\n    if (error) {\n      while (action = actions.shift()) {\n        action.unsubscribe();\n      }\n      throw error;\n    }\n  }\n}\n","import { Scheduler } from '../Scheduler';\nimport { Subscription } from '../Subscription';\nimport { SchedulerAction } from '../types';\n\n/**\n * A unit of work to be executed in a `scheduler`. An action is typically\n * created from within a {@link SchedulerLike} and an RxJS user does not need to concern\n * themselves about creating and manipulating an Action.\n *\n * ```ts\n * class Action<T> extends Subscription {\n *   new (scheduler: Scheduler, work: (state?: T) => void);\n *   schedule(state?: T, delay: number = 0): Subscription;\n * }\n * ```\n *\n * @class Action<T>\n */\nexport class Action<T> extends Subscription {\n  constructor(scheduler: Scheduler, work: (this: SchedulerAction<T>, state?: T) => void) {\n    super();\n  }\n  /**\n   * Schedules this action on its parent {@link SchedulerLike} for execution. May be passed\n   * some context object, `state`. May happen at some point in the future,\n   * according to the `delay` parameter, if specified.\n   * @param {T} [state] Some contextual data that the `work` function uses when\n   * called by the Scheduler.\n   * @param {number} [delay] Time to wait before executing the work, where the\n   * time unit is implicit and defined by the Scheduler.\n   * @return {void}\n   */\n  public schedule(state?: T, delay: number = 0): Subscription {\n    return this;\n  }\n}\n","import { Action } from './Action';\nimport { SchedulerAction } from '../types';\nimport { Subscription } from '../Subscription';\nimport { AsyncScheduler } from './AsyncScheduler';\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nexport class AsyncAction<T> extends Action<T> {\n\n  public id: any;\n  public state: T;\n  public delay: number;\n  protected pending: boolean = false;\n\n  constructor(protected scheduler: AsyncScheduler,\n              protected work: (this: SchedulerAction<T>, state?: T) => void) {\n    super(scheduler, work);\n  }\n\n  public schedule(state?: T, delay: number = 0): Subscription {\n\n    if (this.closed) {\n      return this;\n    }\n\n    // Always replace the current state with the new state.\n    this.state = state;\n\n    const id = this.id;\n    const scheduler = this.scheduler;\n\n    //\n    // Important implementation note:\n    //\n    // Actions only execute once by default, unless rescheduled from within the\n    // scheduled callback. This allows us to implement single and repeat\n    // actions via the same code path, without adding API surface area, as well\n    // as mimic traditional recursion but across asynchronous boundaries.\n    //\n    // However, JS runtimes and timers distinguish between intervals achieved by\n    // serial `setTimeout` calls vs. a single `setInterval` call. An interval of\n    // serial `setTimeout` calls can be individually delayed, which delays\n    // scheduling the next `setTimeout`, and so on. `setInterval` attempts to\n    // guarantee the interval callback will be invoked more precisely to the\n    // interval period, regardless of load.\n    //\n    // Therefore, we use `setInterval` to schedule single and repeat actions.\n    // If the action reschedules itself with the same delay, the interval is not\n    // canceled. If the action doesn't reschedule, or reschedules with a\n    // different delay, the interval will be canceled after scheduled callback\n    // execution.\n    //\n    if (id != null) {\n      this.id = this.recycleAsyncId(scheduler, id, delay);\n    }\n\n    // Set the pending flag indicating that this action has been scheduled, or\n    // has recursively rescheduled itself.\n    this.pending = true;\n\n    this.delay = delay;\n    // If this action has already an async Id, don't request a new one.\n    this.id = this.id || this.requestAsyncId(scheduler, this.id, delay);\n\n    return this;\n  }\n\n  protected requestAsyncId(scheduler: AsyncScheduler, id?: any, delay: number = 0): any {\n    return setInterval(scheduler.flush.bind(scheduler, this), delay);\n  }\n\n  protected recycleAsyncId(scheduler: AsyncScheduler, id: any, delay: number = 0): any {\n    // If this action is rescheduled with the same delay time, don't clear the interval id.\n    if (delay !== null && this.delay === delay && this.pending === false) {\n      return id;\n    }\n    // Otherwise, if the action's delay time is different from the current delay,\n    // or the action has been rescheduled before it's executed, clear the interval id\n    clearInterval(id);\n    return undefined;\n  }\n\n  /**\n   * Immediately executes this action and the `work` it contains.\n   * @return {any}\n   */\n  public execute(state: T, delay: number): any {\n\n    if (this.closed) {\n      return new Error('executing a cancelled action');\n    }\n\n    this.pending = false;\n    const error = this._execute(state, delay);\n    if (error) {\n      return error;\n    } else if (this.pending === false && this.id != null) {\n      // Dequeue if the action didn't reschedule itself. Don't call\n      // unsubscribe(), because the action could reschedule later.\n      // For example:\n      // ```\n      // scheduler.schedule(function doWork(counter) {\n      //   /* ... I'm a busy worker bee ... */\n      //   var originalAction = this;\n      //   /* wait 100ms before rescheduling the action */\n      //   setTimeout(function () {\n      //     originalAction.schedule(counter + 1);\n      //   }, 100);\n      // }, 1000);\n      // ```\n      this.id = this.recycleAsyncId(this.scheduler, this.id, null);\n    }\n  }\n\n  protected _execute(state: T, delay: number): any {\n    let errored: boolean = false;\n    let errorValue: any = undefined;\n    try {\n      this.work(state);\n    } catch (e) {\n      errored = true;\n      errorValue = !!e && e || new Error(e);\n    }\n    if (errored) {\n      this.unsubscribe();\n      return errorValue;\n    }\n  }\n\n  /** @deprecated This is an internal implementation detail, do not use. */\n  _unsubscribe() {\n\n    const id = this.id;\n    const scheduler = this.scheduler;\n    const actions = scheduler.actions;\n    const index = actions.indexOf(this);\n\n    this.work  = null;\n    this.state = null;\n    this.pending = false;\n    this.scheduler = null;\n\n    if (index !== -1) {\n      actions.splice(index, 1);\n    }\n\n    if (id != null) {\n      this.id = this.recycleAsyncId(scheduler, id, null);\n    }\n\n    this.delay = null;\n  }\n}\n","import { noop } from './noop';\nimport { UnaryFunction } from '../types';\n\n/* tslint:disable:max-line-length */\nexport function pipe<T>(): UnaryFunction<T, T>;\nexport function pipe<T, A>(fn1: UnaryFunction<T, A>): UnaryFunction<T, A>;\nexport function pipe<T, A, B>(fn1: UnaryFunction<T, A>, fn2: UnaryFunction<A, B>): UnaryFunction<T, B>;\nexport function pipe<T, A, B, C>(fn1: UnaryFunction<T, A>, fn2: UnaryFunction<A, B>, fn3: UnaryFunction<B, C>): UnaryFunction<T, C>;\nexport function pipe<T, A, B, C, D>(fn1: UnaryFunction<T, A>, fn2: UnaryFunction<A, B>, fn3: UnaryFunction<B, C>, fn4: UnaryFunction<C, D>): UnaryFunction<T, D>;\nexport function pipe<T, A, B, C, D, E>(fn1: UnaryFunction<T, A>, fn2: UnaryFunction<A, B>, fn3: UnaryFunction<B, C>, fn4: UnaryFunction<C, D>, fn5: UnaryFunction<D, E>): UnaryFunction<T, E>;\nexport function pipe<T, A, B, C, D, E, F>(fn1: UnaryFunction<T, A>, fn2: UnaryFunction<A, B>, fn3: UnaryFunction<B, C>, fn4: UnaryFunction<C, D>, fn5: UnaryFunction<D, E>, fn6: UnaryFunction<E, F>): UnaryFunction<T, F>;\nexport function pipe<T, A, B, C, D, E, F, G>(fn1: UnaryFunction<T, A>, fn2: UnaryFunction<A, B>, fn3: UnaryFunction<B, C>, fn4: UnaryFunction<C, D>, fn5: UnaryFunction<D, E>, fn6: UnaryFunction<E, F>, fn7: UnaryFunction<F, G>): UnaryFunction<T, G>;\nexport function pipe<T, A, B, C, D, E, F, G, H>(fn1: UnaryFunction<T, A>, fn2: UnaryFunction<A, B>, fn3: UnaryFunction<B, C>, fn4: UnaryFunction<C, D>, fn5: UnaryFunction<D, E>, fn6: UnaryFunction<E, F>, fn7: UnaryFunction<F, G>, fn8: UnaryFunction<G, H>): UnaryFunction<T, H>;\nexport function pipe<T, A, B, C, D, E, F, G, H, I>(fn1: UnaryFunction<T, A>, fn2: UnaryFunction<A, B>, fn3: UnaryFunction<B, C>, fn4: UnaryFunction<C, D>, fn5: UnaryFunction<D, E>, fn6: UnaryFunction<E, F>, fn7: UnaryFunction<F, G>, fn8: UnaryFunction<G, H>, fn9: UnaryFunction<H, I>): UnaryFunction<T, I>;\nexport function pipe<T, A, B, C, D, E, F, G, H, I>(fn1: UnaryFunction<T, A>, fn2: UnaryFunction<A, B>, fn3: UnaryFunction<B, C>, fn4: UnaryFunction<C, D>, fn5: UnaryFunction<D, E>, fn6: UnaryFunction<E, F>, fn7: UnaryFunction<F, G>, fn8: UnaryFunction<G, H>, fn9: UnaryFunction<H, I>, ...fns: UnaryFunction<any, any>[]): UnaryFunction<T, {}>;\n/* tslint:enable:max-line-length */\n\nexport function pipe(...fns: Array<UnaryFunction<any, any>>): UnaryFunction<any, any> {\n  return pipeFromArray(fns);\n}\n\n/** @internal */\nexport function pipeFromArray<T, R>(fns: Array<UnaryFunction<T, R>>): UnaryFunction<T, R> {\n  if (!fns) {\n    return noop as UnaryFunction<any, any>;\n  }\n\n  if (fns.length === 1) {\n    return fns[0];\n  }\n\n  return function piped(input: T): R {\n    return fns.reduce((prev: any, fn: UnaryFunction<T, R>) => fn(prev), input as any);\n  };\n}\n","import { Operator } from './Operator';\nimport { Subscriber } from './Subscriber';\nimport { Subscription } from './Subscription';\nimport { TeardownLogic, OperatorFunction, PartialObserver, Subscribable } from './types';\nimport { canReportError } from './util/canReportError';\nimport { toSubscriber } from './util/toSubscriber';\nimport { iif } from './observable/iif';\nimport { throwError } from './observable/throwError';\nimport { observable as Symbol_observable } from './symbol/observable';\nimport { pipeFromArray } from './util/pipe';\nimport { config } from './config';\n\n/**\n * A representation of any set of values over any amount of time. This is the most basic building block\n * of RxJS.\n *\n * @class Observable<T>\n */\nexport class Observable<T> implements Subscribable<T> {\n\n  /** Internal implementation detail, do not use directly. */\n  public _isScalar: boolean = false;\n\n  /** @deprecated This is an internal implementation detail, do not use. */\n  source: Observable<any>;\n\n  /** @deprecated This is an internal implementation detail, do not use. */\n  operator: Operator<any, T>;\n\n  /**\n   * @constructor\n   * @param {Function} subscribe the function that is called when the Observable is\n   * initially subscribed to. This function is given a Subscriber, to which new values\n   * can be `next`ed, or an `error` method can be called to raise an error, or\n   * `complete` can be called to notify of a successful completion.\n   */\n  constructor(subscribe?: (this: Observable<T>, subscriber: Subscriber<T>) => TeardownLogic) {\n    if (subscribe) {\n      this._subscribe = subscribe;\n    }\n  }\n\n  // HACK: Since TypeScript inherits static properties too, we have to\n  // fight against TypeScript here so Subject can have a different static create signature\n  /**\n   * Creates a new cold Observable by calling the Observable constructor\n   * @static true\n   * @owner Observable\n   * @method create\n   * @param {Function} subscribe? the subscriber function to be passed to the Observable constructor\n   * @return {Observable} a new cold observable\n   * @nocollapse\n   * @deprecated use new Observable() instead\n   */\n  static create: Function = <T>(subscribe?: (subscriber: Subscriber<T>) => TeardownLogic) => {\n    return new Observable<T>(subscribe);\n  }\n\n  /**\n   * Creates a new Observable, with this Observable as the source, and the passed\n   * operator defined as the new observable's operator.\n   * @method lift\n   * @param {Operator} operator the operator defining the operation to take on the observable\n   * @return {Observable} a new observable with the Operator applied\n   */\n  lift<R>(operator: Operator<T, R>): Observable<R> {\n    const observable = new Observable<R>();\n    observable.source = this;\n    observable.operator = operator;\n    return observable;\n  }\n\n  subscribe(observer?: PartialObserver<T>): Subscription;\n  /** @deprecated Use an observer instead of a complete callback */\n  subscribe(next: null | undefined, error: null | undefined, complete: () => void): Subscription;\n  /** @deprecated Use an observer instead of an error callback */\n  subscribe(next: null | undefined, error: (error: any) => void, complete?: () => void): Subscription;\n  /** @deprecated Use an observer instead of a complete callback */\n  subscribe(next: (value: T) => void, error: null | undefined, complete: () => void): Subscription;\n  subscribe(next?: (value: T) => void, error?: (error: any) => void, complete?: () => void): Subscription;\n  /**\n   * Invokes an execution of an Observable and registers Observer handlers for notifications it will emit.\n   *\n   * <span class=\"informal\">Use it when you have all these Observables, but still nothing is happening.</span>\n   *\n   * `subscribe` is not a regular operator, but a method that calls Observable's internal `subscribe` function. It\n   * might be for example a function that you passed to Observable's constructor, but most of the time it is\n   * a library implementation, which defines what will be emitted by an Observable, and when it be will emitted. This means\n   * that calling `subscribe` is actually the moment when Observable starts its work, not when it is created, as it is often\n   * the thought.\n   *\n   * Apart from starting the execution of an Observable, this method allows you to listen for values\n   * that an Observable emits, as well as for when it completes or errors. You can achieve this in two\n   * of the following ways.\n   *\n   * The first way is creating an object that implements {@link Observer} interface. It should have methods\n   * defined by that interface, but note that it should be just a regular JavaScript object, which you can create\n   * yourself in any way you want (ES6 class, classic function constructor, object literal etc.). In particular do\n   * not attempt to use any RxJS implementation details to create Observers - you don't need them. Remember also\n   * that your object does not have to implement all methods. If you find yourself creating a method that doesn't\n   * do anything, you can simply omit it. Note however, if the `error` method is not provided, all errors will\n   * be left uncaught.\n   *\n   * The second way is to give up on Observer object altogether and simply provide callback functions in place of its methods.\n   * This means you can provide three functions as arguments to `subscribe`, where the first function is equivalent\n   * of a `next` method, the second of an `error` method and the third of a `complete` method. Just as in case of Observer,\n   * if you do not need to listen for something, you can omit a function, preferably by passing `undefined` or `null`,\n   * since `subscribe` recognizes these functions by where they were placed in function call. When it comes\n   * to `error` function, just as before, if not provided, errors emitted by an Observable will be thrown.\n   *\n   * Whichever style of calling `subscribe` you use, in both cases it returns a Subscription object.\n   * This object allows you to call `unsubscribe` on it, which in turn will stop the work that an Observable does and will clean\n   * up all resources that an Observable used. Note that cancelling a subscription will not call `complete` callback\n   * provided to `subscribe` function, which is reserved for a regular completion signal that comes from an Observable.\n   *\n   * Remember that callbacks provided to `subscribe` are not guaranteed to be called asynchronously.\n   * It is an Observable itself that decides when these functions will be called. For example {@link of}\n   * by default emits all its values synchronously. Always check documentation for how given Observable\n   * will behave when subscribed and if its default behavior can be modified with a `scheduler`.\n   *\n   * ## Example\n   * ### Subscribe with an Observer\n   * ```ts\n   * import { of } from 'rxjs';\n   *\n   * const sumObserver = {\n   *   sum: 0,\n   *   next(value) {\n   *     console.log('Adding: ' + value);\n   *     this.sum = this.sum + value;\n   *   },\n   *   error() {\n   *     // We actually could just remove this method,\n   *     // since we do not really care about errors right now.\n   *   },\n   *   complete() {\n   *     console.log('Sum equals: ' + this.sum);\n   *   }\n   * };\n   *\n   * of(1, 2, 3) // Synchronously emits 1, 2, 3 and then completes.\n   *   .subscribe(sumObserver);\n   *\n   * // Logs:\n   * // \"Adding: 1\"\n   * // \"Adding: 2\"\n   * // \"Adding: 3\"\n   * // \"Sum equals: 6\"\n   * ```\n   *\n   * ### Subscribe with functions\n   * ```ts\n   * import { of } from 'rxjs'\n   *\n   * let sum = 0;\n   *\n   * of(1, 2, 3).subscribe(\n   *   value => {\n   *     console.log('Adding: ' + value);\n   *     sum = sum + value;\n   *   },\n   *   undefined,\n   *   () => console.log('Sum equals: ' + sum)\n   * );\n   *\n   * // Logs:\n   * // \"Adding: 1\"\n   * // \"Adding: 2\"\n   * // \"Adding: 3\"\n   * // \"Sum equals: 6\"\n   * ```\n   *\n   * ### Cancel a subscription\n   * ```ts\n   * import { interval } from 'rxjs';\n   *\n   * const subscription = interval(1000).subscribe(\n   *   num => console.log(num),\n   *   undefined,\n   *   () => {\n   *     // Will not be called, even when cancelling subscription.\n   *     console.log('completed!');\n   *   }\n   * );\n   *\n   * setTimeout(() => {\n   *   subscription.unsubscribe();\n   *   console.log('unsubscribed!');\n   * }, 2500);\n   *\n   * // Logs:\n   * // 0 after 1s\n   * // 1 after 2s\n   * // \"unsubscribed!\" after 2.5s\n   * ```\n   *\n   * @param {Observer|Function} observerOrNext (optional) Either an observer with methods to be called,\n   *  or the first of three possible handlers, which is the handler for each value emitted from the subscribed\n   *  Observable.\n   * @param {Function} error (optional) A handler for a terminal event resulting from an error. If no error handler is provided,\n   *  the error will be thrown as unhandled.\n   * @param {Function} complete (optional) A handler for a terminal event resulting from successful completion.\n   * @return {ISubscription} a subscription reference to the registered handlers\n   * @method subscribe\n   */\n  subscribe(observerOrNext?: PartialObserver<T> | ((value: T) => void),\n            error?: (error: any) => void,\n            complete?: () => void): Subscription {\n\n    const { operator } = this;\n    const sink = toSubscriber(observerOrNext, error, complete);\n\n    if (operator) {\n      sink.add(operator.call(sink, this.source));\n    } else {\n      sink.add(\n        this.source || (config.useDeprecatedSynchronousErrorHandling && !sink.syncErrorThrowable) ?\n        this._subscribe(sink) :\n        this._trySubscribe(sink)\n      );\n    }\n\n    if (config.useDeprecatedSynchronousErrorHandling) {\n      if (sink.syncErrorThrowable) {\n        sink.syncErrorThrowable = false;\n        if (sink.syncErrorThrown) {\n          throw sink.syncErrorValue;\n        }\n      }\n    }\n\n    return sink;\n  }\n\n  /** @deprecated This is an internal implementation detail, do not use. */\n  _trySubscribe(sink: Subscriber<T>): TeardownLogic {\n    try {\n      return this._subscribe(sink);\n    } catch (err) {\n      if (config.useDeprecatedSynchronousErrorHandling) {\n        sink.syncErrorThrown = true;\n        sink.syncErrorValue = err;\n      }\n      if (canReportError(sink)) {\n        sink.error(err);\n      } else {\n        console.warn(err);\n      }\n    }\n  }\n\n  /**\n   * @method forEach\n   * @param {Function} next a handler for each value emitted by the observable\n   * @param {PromiseConstructor} [promiseCtor] a constructor function used to instantiate the Promise\n   * @return {Promise} a promise that either resolves on observable completion or\n   *  rejects with the handled error\n   */\n  forEach(next: (value: T) => void, promiseCtor?: PromiseConstructorLike): Promise<void> {\n    promiseCtor = getPromiseCtor(promiseCtor);\n\n    return new promiseCtor<void>((resolve, reject) => {\n      // Must be declared in a separate statement to avoid a ReferenceError when\n      // accessing subscription below in the closure due to Temporal Dead Zone.\n      let subscription: Subscription;\n      subscription = this.subscribe((value) => {\n        try {\n          next(value);\n        } catch (err) {\n          reject(err);\n          if (subscription) {\n            subscription.unsubscribe();\n          }\n        }\n      }, reject, resolve);\n    }) as Promise<void>;\n  }\n\n  /** @internal This is an internal implementation detail, do not use. */\n  _subscribe(subscriber: Subscriber<any>): TeardownLogic {\n    const { source } = this;\n    return source && source.subscribe(subscriber);\n  }\n\n  // `if` and `throw` are special snow flakes, the compiler sees them as reserved words. Deprecated in\n  // favor of iif and throwError functions.\n  /**\n   * @nocollapse\n   * @deprecated In favor of iif creation function: import { iif } from 'rxjs';\n   */\n  static if: typeof iif;\n  /**\n   * @nocollapse\n   * @deprecated In favor of throwError creation function: import { throwError } from 'rxjs';\n   */\n  static throw: typeof throwError;\n\n  /**\n   * An interop point defined by the es7-observable spec https://github.com/zenparsing/es-observable\n   * @method Symbol.observable\n   * @return {Observable} this instance of the observable\n   */\n  [Symbol_observable]() {\n    return this;\n  }\n\n  /* tslint:disable:max-line-length */\n  pipe(): Observable<T>;\n  pipe<A>(op1: OperatorFunction<T, A>): Observable<A>;\n  pipe<A, B>(op1: OperatorFunction<T, A>, op2: OperatorFunction<A, B>): Observable<B>;\n  pipe<A, B, C>(op1: OperatorFunction<T, A>, op2: OperatorFunction<A, B>, op3: OperatorFunction<B, C>): Observable<C>;\n  pipe<A, B, C, D>(op1: OperatorFunction<T, A>, op2: OperatorFunction<A, B>, op3: OperatorFunction<B, C>, op4: OperatorFunction<C, D>): Observable<D>;\n  pipe<A, B, C, D, E>(op1: OperatorFunction<T, A>, op2: OperatorFunction<A, B>, op3: OperatorFunction<B, C>, op4: OperatorFunction<C, D>, op5: OperatorFunction<D, E>): Observable<E>;\n  pipe<A, B, C, D, E, F>(op1: OperatorFunction<T, A>, op2: OperatorFunction<A, B>, op3: OperatorFunction<B, C>, op4: OperatorFunction<C, D>, op5: OperatorFunction<D, E>, op6: OperatorFunction<E, F>): Observable<F>;\n  pipe<A, B, C, D, E, F, G>(op1: OperatorFunction<T, A>, op2: OperatorFunction<A, B>, op3: OperatorFunction<B, C>, op4: OperatorFunction<C, D>, op5: OperatorFunction<D, E>, op6: OperatorFunction<E, F>, op7: OperatorFunction<F, G>): Observable<G>;\n  pipe<A, B, C, D, E, F, G, H>(op1: OperatorFunction<T, A>, op2: OperatorFunction<A, B>, op3: OperatorFunction<B, C>, op4: OperatorFunction<C, D>, op5: OperatorFunction<D, E>, op6: OperatorFunction<E, F>, op7: OperatorFunction<F, G>, op8: OperatorFunction<G, H>): Observable<H>;\n  pipe<A, B, C, D, E, F, G, H, I>(op1: OperatorFunction<T, A>, op2: OperatorFunction<A, B>, op3: OperatorFunction<B, C>, op4: OperatorFunction<C, D>, op5: OperatorFunction<D, E>, op6: OperatorFunction<E, F>, op7: OperatorFunction<F, G>, op8: OperatorFunction<G, H>, op9: OperatorFunction<H, I>): Observable<I>;\n  pipe<A, B, C, D, E, F, G, H, I>(op1: OperatorFunction<T, A>, op2: OperatorFunction<A, B>, op3: OperatorFunction<B, C>, op4: OperatorFunction<C, D>, op5: OperatorFunction<D, E>, op6: OperatorFunction<E, F>, op7: OperatorFunction<F, G>, op8: OperatorFunction<G, H>, op9: OperatorFunction<H, I>, ...operations: OperatorFunction<any, any>[]): Observable<{}>;\n  /* tslint:enable:max-line-length */\n\n  /**\n   * Used to stitch together functional operators into a chain.\n   * @method pipe\n   * @return {Observable} the Observable result of all of the operators having\n   * been called in the order they were passed in.\n   *\n   * ### Example\n   * ```ts\n   * import { interval } from 'rxjs';\n   * import { map, filter, scan } from 'rxjs/operators';\n   *\n   * interval(1000)\n   *   .pipe(\n   *     filter(x => x % 2 === 0),\n   *     map(x => x + x),\n   *     scan((acc, x) => acc + x)\n   *   )\n   *   .subscribe(x => console.log(x))\n   * ```\n   */\n  pipe(...operations: OperatorFunction<any, any>[]): Observable<any> {\n    if (operations.length === 0) {\n      return this as any;\n    }\n\n    return pipeFromArray(operations)(this);\n  }\n\n  /* tslint:disable:max-line-length */\n  toPromise<T>(this: Observable<T>): Promise<T>;\n  toPromise<T>(this: Observable<T>, PromiseCtor: typeof Promise): Promise<T>;\n  toPromise<T>(this: Observable<T>, PromiseCtor: PromiseConstructorLike): Promise<T>;\n  /* tslint:enable:max-line-length */\n\n  toPromise(promiseCtor?: PromiseConstructorLike): Promise<T> {\n    promiseCtor = getPromiseCtor(promiseCtor);\n\n    return new promiseCtor((resolve, reject) => {\n      let value: any;\n      this.subscribe((x: T) => value = x, (err: any) => reject(err), () => resolve(value));\n    }) as Promise<T>;\n  }\n}\n\n/**\n * Decides between a passed promise constructor from consuming code,\n * A default configured promise constructor, and the native promise\n * constructor and returns it. If nothing can be found, it will throw\n * an error.\n * @param promiseCtor The optional promise constructor to passed by consuming code\n */\nfunction getPromiseCtor(promiseCtor: PromiseConstructorLike | undefined) {\n  if (!promiseCtor) {\n    promiseCtor = config.Promise || Promise;\n  }\n\n  if (!promiseCtor) {\n    throw new Error('no Promise impl found');\n  }\n\n  return promiseCtor;\n}\n","import { Subscriber } from '../Subscriber';\nimport { rxSubscriber as rxSubscriberSymbol } from '../symbol/rxSubscriber';\nimport { empty as emptyObserver } from '../Observer';\nimport { PartialObserver } from '../types';\n\nexport function toSubscriber<T>(\n  nextOrObserver?: PartialObserver<T> | ((value: T) => void),\n  error?: (error: any) => void,\n  complete?: () => void): Subscriber<T> {\n\n  if (nextOrObserver) {\n    if (nextOrObserver instanceof Subscriber) {\n      return (<Subscriber<T>> nextOrObserver);\n    }\n\n    if (nextOrObserver[rxSubscriberSymbol]) {\n      return nextOrObserver[rxSubscriberSymbol]();\n    }\n  }\n\n  if (!nextOrObserver && !error && !complete) {\n    return new Subscriber(emptyObserver);\n  }\n\n  return new Subscriber(nextOrObserver, error, complete);\n}\n","import { Subscriber } from '../Subscriber';\nimport { Subject } from '../Subject';\n\n/**\n * Determines whether the ErrorObserver is closed or stopped or has a\n * destination that is closed or stopped - in which case errors will\n * need to be reported via a different mechanism.\n * @param observer the observer\n */\nexport function canReportError(observer: Subscriber<any> | Subject<any>): boolean {\n  while (observer) {\n    const { closed, destination, isStopped } = observer as any;\n    if (closed || isStopped) {\n      return false;\n    } else if (destination && destination instanceof Subscriber) {\n      observer = destination;\n    } else {\n      observer = null;\n    }\n  }\n  return true;\n}\n","import { isFunction } from './util/isFunction';\nimport { empty as emptyObserver } from './Observer';\nimport { Observer, PartialObserver, TeardownLogic } from './types';\nimport { Subscription } from './Subscription';\nimport { rxSubscriber as rxSubscriberSymbol } from '../internal/symbol/rxSubscriber';\nimport { config } from './config';\nimport { hostReportError } from './util/hostReportError';\n\n/**\n * Implements the {@link Observer} interface and extends the\n * {@link Subscription} class. While the {@link Observer} is the public API for\n * consuming the values of an {@link Observable}, all Observers get converted to\n * a Subscriber, in order to provide Subscription-like capabilities such as\n * `unsubscribe`. Subscriber is a common type in RxJS, and crucial for\n * implementing operators, but it is rarely used as a public API.\n *\n * @class Subscriber<T>\n */\nexport class Subscriber<T> extends Subscription implements Observer<T> {\n\n  [rxSubscriberSymbol]() { return this; }\n\n  /**\n   * A static factory for a Subscriber, given a (potentially partial) definition\n   * of an Observer.\n   * @param {function(x: ?T): void} [next] The `next` callback of an Observer.\n   * @param {function(e: ?any): void} [error] The `error` callback of an\n   * Observer.\n   * @param {function(): void} [complete] The `complete` callback of an\n   * Observer.\n   * @return {Subscriber<T>} A Subscriber wrapping the (partially defined)\n   * Observer represented by the given arguments.\n   * @nocollapse\n   */\n  static create<T>(next?: (x?: T) => void,\n                   error?: (e?: any) => void,\n                   complete?: () => void): Subscriber<T> {\n    const subscriber = new Subscriber(next, error, complete);\n    subscriber.syncErrorThrowable = false;\n    return subscriber;\n  }\n\n  /** @internal */ syncErrorValue: any = null;\n  /** @internal */ syncErrorThrown: boolean = false;\n  /** @internal */ syncErrorThrowable: boolean = false;\n\n  protected isStopped: boolean = false;\n  protected destination: PartialObserver<any> | Subscriber<any>; // this `any` is the escape hatch to erase extra type param (e.g. R)\n\n  /**\n   * @param {Observer|function(value: T): void} [destinationOrNext] A partially\n   * defined Observer or a `next` callback function.\n   * @param {function(e: ?any): void} [error] The `error` callback of an\n   * Observer.\n   * @param {function(): void} [complete] The `complete` callback of an\n   * Observer.\n   */\n  constructor(destinationOrNext?: PartialObserver<any> | ((value: T) => void),\n              error?: (e?: any) => void,\n              complete?: () => void) {\n    super();\n\n    switch (arguments.length) {\n      case 0:\n        this.destination = emptyObserver;\n        break;\n      case 1:\n        if (!destinationOrNext) {\n          this.destination = emptyObserver;\n          break;\n        }\n        if (typeof destinationOrNext === 'object') {\n          if (destinationOrNext instanceof Subscriber) {\n            this.syncErrorThrowable = destinationOrNext.syncErrorThrowable;\n            this.destination = destinationOrNext;\n            destinationOrNext.add(this);\n          } else {\n            this.syncErrorThrowable = true;\n            this.destination = new SafeSubscriber<T>(this, <PartialObserver<any>> destinationOrNext);\n          }\n          break;\n        }\n      default:\n        this.syncErrorThrowable = true;\n        this.destination = new SafeSubscriber<T>(this, <((value: T) => void)> destinationOrNext, error, complete);\n        break;\n    }\n  }\n\n  /**\n   * The {@link Observer} callback to receive notifications of type `next` from\n   * the Observable, with a value. The Observable may call this method 0 or more\n   * times.\n   * @param {T} [value] The `next` value.\n   * @return {void}\n   */\n  next(value?: T): void {\n    if (!this.isStopped) {\n      this._next(value);\n    }\n  }\n\n  /**\n   * The {@link Observer} callback to receive notifications of type `error` from\n   * the Observable, with an attached `Error`. Notifies the Observer that\n   * the Observable has experienced an error condition.\n   * @param {any} [err] The `error` exception.\n   * @return {void}\n   */\n  error(err?: any): void {\n    if (!this.isStopped) {\n      this.isStopped = true;\n      this._error(err);\n    }\n  }\n\n  /**\n   * The {@link Observer} callback to receive a valueless notification of type\n   * `complete` from the Observable. Notifies the Observer that the Observable\n   * has finished sending push-based notifications.\n   * @return {void}\n   */\n  complete(): void {\n    if (!this.isStopped) {\n      this.isStopped = true;\n      this._complete();\n    }\n  }\n\n  unsubscribe(): void {\n    if (this.closed) {\n      return;\n    }\n    this.isStopped = true;\n    super.unsubscribe();\n  }\n\n  protected _next(value: T): void {\n    this.destination.next(value);\n  }\n\n  protected _error(err: any): void {\n    this.destination.error(err);\n    this.unsubscribe();\n  }\n\n  protected _complete(): void {\n    this.destination.complete();\n    this.unsubscribe();\n  }\n\n  /** @deprecated This is an internal implementation detail, do not use. */\n  _unsubscribeAndRecycle(): Subscriber<T> {\n    const {  _parentOrParents } = this;\n    this._parentOrParents = null;\n    this.unsubscribe();\n    this.closed = false;\n    this.isStopped = false;\n    this._parentOrParents = _parentOrParents;\n    return this;\n  }\n}\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nexport class SafeSubscriber<T> extends Subscriber<T> {\n\n  private _context: any;\n\n  constructor(private _parentSubscriber: Subscriber<T>,\n              observerOrNext?: PartialObserver<T> | ((value: T) => void),\n              error?: (e?: any) => void,\n              complete?: () => void) {\n    super();\n\n    let next: ((value: T) => void);\n    let context: any = this;\n\n    if (isFunction(observerOrNext)) {\n      next = (<((value: T) => void)> observerOrNext);\n    } else if (observerOrNext) {\n      next = (<PartialObserver<T>> observerOrNext).next;\n      error = (<PartialObserver<T>> observerOrNext).error;\n      complete = (<PartialObserver<T>> observerOrNext).complete;\n      if (observerOrNext !== emptyObserver) {\n        context = Object.create(observerOrNext);\n        if (isFunction(context.unsubscribe)) {\n          this.add(<() => void> context.unsubscribe.bind(context));\n        }\n        context.unsubscribe = this.unsubscribe.bind(this);\n      }\n    }\n\n    this._context = context;\n    this._next = next;\n    this._error = error;\n    this._complete = complete;\n  }\n\n  next(value?: T): void {\n    if (!this.isStopped && this._next) {\n      const { _parentSubscriber } = this;\n      if (!config.useDeprecatedSynchronousErrorHandling || !_parentSubscriber.syncErrorThrowable) {\n        this.__tryOrUnsub(this._next, value);\n      } else if (this.__tryOrSetError(_parentSubscriber, this._next, value)) {\n        this.unsubscribe();\n      }\n    }\n  }\n\n  error(err?: any): void {\n    if (!this.isStopped) {\n      const { _parentSubscriber } = this;\n      const { useDeprecatedSynchronousErrorHandling } = config;\n      if (this._error) {\n        if (!useDeprecatedSynchronousErrorHandling || !_parentSubscriber.syncErrorThrowable) {\n          this.__tryOrUnsub(this._error, err);\n          this.unsubscribe();\n        } else {\n          this.__tryOrSetError(_parentSubscriber, this._error, err);\n          this.unsubscribe();\n        }\n      } else if (!_parentSubscriber.syncErrorThrowable) {\n        this.unsubscribe();\n        if (useDeprecatedSynchronousErrorHandling) {\n          throw err;\n        }\n        hostReportError(err);\n      } else {\n        if (useDeprecatedSynchronousErrorHandling) {\n          _parentSubscriber.syncErrorValue = err;\n          _parentSubscriber.syncErrorThrown = true;\n        } else {\n          hostReportError(err);\n        }\n        this.unsubscribe();\n      }\n    }\n  }\n\n  complete(): void {\n    if (!this.isStopped) {\n      const { _parentSubscriber } = this;\n      if (this._complete) {\n        const wrappedComplete = () => this._complete.call(this._context);\n\n        if (!config.useDeprecatedSynchronousErrorHandling || !_parentSubscriber.syncErrorThrowable) {\n          this.__tryOrUnsub(wrappedComplete);\n          this.unsubscribe();\n        } else {\n          this.__tryOrSetError(_parentSubscriber, wrappedComplete);\n          this.unsubscribe();\n        }\n      } else {\n        this.unsubscribe();\n      }\n    }\n  }\n\n  private __tryOrUnsub(fn: Function, value?: any): void {\n    try {\n      fn.call(this._context, value);\n    } catch (err) {\n      this.unsubscribe();\n      if (config.useDeprecatedSynchronousErrorHandling) {\n        throw err;\n      } else {\n        hostReportError(err);\n      }\n    }\n  }\n\n  private __tryOrSetError(parent: Subscriber<T>, fn: Function, value?: any): boolean {\n    if (!config.useDeprecatedSynchronousErrorHandling) {\n      throw new Error('bad call');\n    }\n    try {\n      fn.call(this._context, value);\n    } catch (err) {\n      if (config.useDeprecatedSynchronousErrorHandling) {\n        parent.syncErrorValue = err;\n        parent.syncErrorThrown = true;\n        return true;\n      } else {\n        hostReportError(err);\n        return true;\n      }\n    }\n    return false;\n  }\n\n  /** @internal This is an internal implementation detail, do not use. */\n  _unsubscribe(): void {\n    const { _parentSubscriber } = this;\n    this._context = null;\n    this._parentSubscriber = null;\n    _parentSubscriber.unsubscribe();\n  }\n}\n","export interface UnsubscriptionError extends Error {\n  readonly errors: any[];\n}\n\nexport interface UnsubscriptionErrorCtor {\n  new(errors: any[]): UnsubscriptionError;\n}\n\nconst UnsubscriptionErrorImpl = (() => {\n  function UnsubscriptionErrorImpl(this: any, errors: any[]) {\n    Error.call(this);\n    this.message = errors ?\n      `${errors.length} errors occurred during unsubscription:\n${errors.map((err, i) => `${i + 1}) ${err.toString()}`).join('\\n  ')}` : '';\n    this.name = 'UnsubscriptionError';\n    this.errors = errors;\n    return this;\n  }\n\n  UnsubscriptionErrorImpl.prototype = Object.create(Error.prototype);\n\n  return UnsubscriptionErrorImpl;\n})();\n\n/**\n * An error thrown when one or more errors have occurred during the\n * `unsubscribe` of a {@link Subscription}.\n */\nexport const UnsubscriptionError: UnsubscriptionErrorCtor = UnsubscriptionErrorImpl as any;","import { isArray } from './util/isArray';\nimport { isObject } from './util/isObject';\nimport { isFunction } from './util/isFunction';\nimport { UnsubscriptionError } from './util/UnsubscriptionError';\nimport { SubscriptionLike, TeardownLogic } from './types';\n\n/**\n * Represents a disposable resource, such as the execution of an Observable. A\n * Subscription has one important method, `unsubscribe`, that takes no argument\n * and just disposes the resource held by the subscription.\n *\n * Additionally, subscriptions may be grouped together through the `add()`\n * method, which will attach a child Subscription to the current Subscription.\n * When a Subscription is unsubscribed, all its children (and its grandchildren)\n * will be unsubscribed as well.\n *\n * @class Subscription\n */\nexport class Subscription implements SubscriptionLike {\n  /** @nocollapse */\n  public static EMPTY: Subscription = (function(empty: any) {\n    empty.closed = true;\n    return empty;\n  }(new Subscription()));\n\n  /**\n   * A flag to indicate whether this Subscription has already been unsubscribed.\n   * @type {boolean}\n   */\n  public closed: boolean = false;\n\n  /** @internal */\n  protected _parentOrParents: Subscription | Subscription[] = null;\n  /** @internal */\n  private _subscriptions: SubscriptionLike[] = null;\n\n  /**\n   * @param {function(): void} [unsubscribe] A function describing how to\n   * perform the disposal of resources when the `unsubscribe` method is called.\n   */\n  constructor(unsubscribe?: () => void) {\n    if (unsubscribe) {\n      (<any> this)._unsubscribe = unsubscribe;\n    }\n  }\n\n  /**\n   * Disposes the resources held by the subscription. May, for instance, cancel\n   * an ongoing Observable execution or cancel any other type of work that\n   * started when the Subscription was created.\n   * @return {void}\n   */\n  unsubscribe(): void {\n    let errors: any[];\n\n    if (this.closed) {\n      return;\n    }\n\n    let { _parentOrParents, _unsubscribe, _subscriptions } = (<any> this);\n\n    this.closed = true;\n    this._parentOrParents = null;\n    // null out _subscriptions first so any child subscriptions that attempt\n    // to remove themselves from this subscription will noop\n    this._subscriptions = null;\n\n    if (_parentOrParents instanceof Subscription) {\n      _parentOrParents.remove(this);\n    } else if (_parentOrParents !== null) {\n      for (let index = 0; index < _parentOrParents.length; ++index) {\n        const parent = _parentOrParents[index];\n        parent.remove(this);\n      }\n    }\n\n    if (isFunction(_unsubscribe)) {\n      try {\n        _unsubscribe.call(this);\n      } catch (e) {\n        errors = e instanceof UnsubscriptionError ? flattenUnsubscriptionErrors(e.errors) : [e];\n      }\n    }\n\n    if (isArray(_subscriptions)) {\n      let index = -1;\n      let len = _subscriptions.length;\n\n      while (++index < len) {\n        const sub = _subscriptions[index];\n        if (isObject(sub)) {\n          try {\n            sub.unsubscribe();\n          } catch (e) {\n            errors = errors || [];\n            if (e instanceof UnsubscriptionError) {\n              errors = errors.concat(flattenUnsubscriptionErrors(e.errors));\n            } else {\n              errors.push(e);\n            }\n          }\n        }\n      }\n    }\n\n    if (errors) {\n      throw new UnsubscriptionError(errors);\n    }\n  }\n\n  /**\n   * Adds a tear down to be called during the unsubscribe() of this\n   * Subscription. Can also be used to add a child subscription.\n   *\n   * If the tear down being added is a subscription that is already\n   * unsubscribed, is the same reference `add` is being called on, or is\n   * `Subscription.EMPTY`, it will not be added.\n   *\n   * If this subscription is already in an `closed` state, the passed\n   * tear down logic will be executed immediately.\n   *\n   * When a parent subscription is unsubscribed, any child subscriptions that were added to it are also unsubscribed.\n   *\n   * @param {TeardownLogic} teardown The additional logic to execute on\n   * teardown.\n   * @return {Subscription} Returns the Subscription used or created to be\n   * added to the inner subscriptions list. This Subscription can be used with\n   * `remove()` to remove the passed teardown logic from the inner subscriptions\n   * list.\n   */\n  add(teardown: TeardownLogic): Subscription {\n    let subscription = (<Subscription>teardown);\n\n    if (!(<any>teardown)) {\n      return Subscription.EMPTY;\n    }\n\n    switch (typeof teardown) {\n      case 'function':\n        subscription = new Subscription(<(() => void)>teardown);\n      case 'object':\n        if (subscription === this || subscription.closed || typeof subscription.unsubscribe !== 'function') {\n          // This also covers the case where `subscription` is `Subscription.EMPTY`, which is always in `closed` state.\n          return subscription;\n        } else if (this.closed) {\n          subscription.unsubscribe();\n          return subscription;\n        } else if (!(subscription instanceof Subscription)) {\n          const tmp = subscription;\n          subscription = new Subscription();\n          subscription._subscriptions = [tmp];\n        }\n        break;\n      default: {\n        throw new Error('unrecognized teardown ' + teardown + ' added to Subscription.');\n      }\n    }\n\n    // Add `this` as parent of `subscription` if that's not already the case.\n    let { _parentOrParents } = subscription;\n    if (_parentOrParents === null) {\n      // If we don't have a parent, then set `subscription._parents` to\n      // the `this`, which is the common case that we optimize for.\n      subscription._parentOrParents = this;\n    } else if (_parentOrParents instanceof Subscription) {\n      if (_parentOrParents === this) {\n        // The `subscription` already has `this` as a parent.\n        return subscription;\n      }\n      // If there's already one parent, but not multiple, allocate an\n      // Array to store the rest of the parent Subscriptions.\n      subscription._parentOrParents = [_parentOrParents, this];\n    } else if (_parentOrParents.indexOf(this) === -1) {\n      // Only add `this` to the _parentOrParents list if it's not already there.\n      _parentOrParents.push(this);\n    } else {\n      // The `subscription` already has `this` as a parent.\n      return subscription;\n    }\n\n    // Optimize for the common case when adding the first subscription.\n    const subscriptions = this._subscriptions;\n    if (subscriptions === null) {\n      this._subscriptions = [subscription];\n    } else {\n      subscriptions.push(subscription);\n    }\n\n    return subscription;\n  }\n\n  /**\n   * Removes a Subscription from the internal list of subscriptions that will\n   * unsubscribe during the unsubscribe process of this Subscription.\n   * @param {Subscription} subscription The subscription to remove.\n   * @return {void}\n   */\n  remove(subscription: Subscription): void {\n    const subscriptions = this._subscriptions;\n    if (subscriptions) {\n      const subscriptionIndex = subscriptions.indexOf(subscription);\n      if (subscriptionIndex !== -1) {\n        subscriptions.splice(subscriptionIndex, 1);\n      }\n    }\n  }\n}\n\nfunction flattenUnsubscriptionErrors(errors: any[]) {\n return errors.reduce((errs, err) => errs.concat((err instanceof UnsubscriptionError) ? err.errors : err), []);\n}\n","import { Operator } from '../Operator';\nimport { Subscriber } from '../Subscriber';\nimport { Observable } from '../Observable';\nimport { OperatorFunction } from '../types';\n\n/**\n * Applies a given `project` function to each value emitted by the source\n * Observable, and emits the resulting values as an Observable.\n *\n * <span class=\"informal\">Like [Array.prototype.map()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map),\n * it passes each source value through a transformation function to get\n * corresponding output values.</span>\n *\n * ![](map.png)\n *\n * Similar to the well known `Array.prototype.map` function, this operator\n * applies a projection to each value and emits that projection in the output\n * Observable.\n *\n * ## Example\n * Map every click to the clientX position of that click\n * ```ts\n * import { fromEvent } from 'rxjs';\n * import { map } from 'rxjs/operators';\n *\n * const clicks = fromEvent(document, 'click');\n * const positions = clicks.pipe(map(ev => ev.clientX));\n * positions.subscribe(x => console.log(x));\n * ```\n *\n * @see {@link mapTo}\n * @see {@link pluck}\n *\n * @param {function(value: T, index: number): R} project The function to apply\n * to each `value` emitted by the source Observable. The `index` parameter is\n * the number `i` for the i-th emission that has happened since the\n * subscription, starting from the number `0`.\n * @param {any} [thisArg] An optional argument to define what `this` is in the\n * `project` function.\n * @return {Observable<R>} An Observable that emits the values from the source\n * Observable transformed by the given `project` function.\n * @method map\n * @owner Observable\n */\nexport function map<T, R>(project: (value: T, index: number) => R, thisArg?: any): OperatorFunction<T, R> {\n  return function mapOperation(source: Observable<T>): Observable<R> {\n    if (typeof project !== 'function') {\n      throw new TypeError('argument is not a function. Are you looking for `mapTo()`?');\n    }\n    return source.lift(new MapOperator(project, thisArg));\n  };\n}\n\nexport class MapOperator<T, R> implements Operator<T, R> {\n  constructor(private project: (value: T, index: number) => R, private thisArg: any) {\n  }\n\n  call(subscriber: Subscriber<R>, source: any): any {\n    return source.subscribe(new MapSubscriber(subscriber, this.project, this.thisArg));\n  }\n}\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nclass MapSubscriber<T, R> extends Subscriber<T> {\n  count: number = 0;\n  private thisArg: any;\n\n  constructor(destination: Subscriber<R>,\n              private project: (value: T, index: number) => R,\n              thisArg: any) {\n    super(destination);\n    this.thisArg = thisArg || this;\n  }\n\n  // NOTE: This looks unoptimized, but it's actually purposefully NOT\n  // using try/catch optimizations.\n  protected _next(value: T) {\n    let result: R;\n    try {\n      result = this.project.call(this.thisArg, value, this.count++);\n    } catch (err) {\n      this.destination.error(err);\n      return;\n    }\n    this.destination.next(result);\n  }\n}\n","import { SchedulerLike } from '../types';\nimport { isScheduler } from '../util/isScheduler';\nimport { fromArray } from './fromArray';\nimport { Observable } from '../Observable';\nimport { scheduleArray } from '../scheduled/scheduleArray';\n\n/* tslint:disable:max-line-length */\n/** @deprecated use {@link scheduled} instead `scheduled([a, b, c], scheduler)` */\nexport function of<T>(a: T, scheduler: SchedulerLike): Observable<T>;\n/** @deprecated use {@link scheduled} instead `scheduled([a, b, c], scheduler)` */\nexport function of<T, T2>(a: T, b: T2, scheduler: SchedulerLike): Observable<T | T2>;\n/** @deprecated use {@link scheduled} instead `scheduled([a, b, c], scheduler)` */\nexport function of<T, T2, T3>(a: T, b: T2, c: T3, scheduler: SchedulerLike): Observable<T | T2 | T3>;\n/** @deprecated use {@link scheduled} instead `scheduled([a, b, c], scheduler)` */\nexport function of<T, T2, T3, T4>(a: T, b: T2, c: T3, d: T4, scheduler: SchedulerLike): Observable<T | T2 | T3 | T4>;\n/** @deprecated use {@link scheduled} instead `scheduled([a, b, c], scheduler)` */\nexport function of<T, T2, T3, T4, T5>(a: T, b: T2, c: T3, d: T4, e: T5, scheduler: SchedulerLike): Observable<T | T2 | T3 | T4 | T5>;\n/** @deprecated use {@link scheduled} instead `scheduled([a, b, c], scheduler)` */\nexport function of<T, T2, T3, T4, T5, T6>(a: T, b: T2, c: T3, d: T4, e: T5, f: T6, scheduler: SchedulerLike): Observable<T | T2 | T3 | T4 | T5 | T6>;\n/** @deprecated use {@link scheduled} instead `scheduled([a, b, c], scheduler)` */\nexport function of<T, T2, T3, T4, T5, T6, T7>(a: T, b: T2, c: T3, d: T4, e: T5, f: T6, g: T7, scheduler: SchedulerLike):\n  Observable<T | T2 | T3 | T4 | T5 | T6 | T7>;\n/** @deprecated use {@link scheduled} instead `scheduled([a, b, c], scheduler)` */\nexport function of<T, T2, T3, T4, T5, T6, T7, T8>(a: T, b: T2, c: T3, d: T4, e: T5, f: T6, g: T7, h: T8, scheduler: SchedulerLike):\n  Observable<T | T2 | T3 | T4 | T5 | T6 | T7 | T8>;\n/** @deprecated use {@link scheduled} instead `scheduled([a, b, c], scheduler)` */\nexport function of<T, T2, T3, T4, T5, T6, T7, T8, T9>(a: T, b: T2, c: T3, d: T4, e: T5, f: T6, g: T7, h: T8, i: T9, scheduler: SchedulerLike):\n  Observable<T | T2 | T3 | T4 | T5 | T6 | T7 | T8 | T9>;\nexport function of<T>(...args: (T | SchedulerLike)[]): Observable<T>;\n\n// TODO(benlesh): Update the typings for this when we can switch to TS 3.x\nexport function of<T>(a: T): Observable<T>;\nexport function of<T, T2>(a: T, b: T2): Observable<T | T2>;\nexport function of<T, T2, T3>(a: T, b: T2, c: T3): Observable<T | T2 | T3>;\nexport function of<T, T2, T3, T4>(a: T, b: T2, c: T3, d: T4): Observable<T | T2 | T3 | T4>;\nexport function of<T, T2, T3, T4, T5>(a: T, b: T2, c: T3, d: T4, e: T5): Observable<T | T2 | T3 | T4 | T5>;\nexport function of<T, T2, T3, T4, T5, T6>(a: T, b: T2, c: T3, d: T4, e: T5, f: T6): Observable<T | T2 | T3 | T4 | T5 | T6>;\nexport function of<T, T2, T3, T4, T5, T6, T7>(a: T, b: T2, c: T3, d: T4, e: T5, f: T6, g: T7):\n  Observable<T | T2 | T3 | T4 | T5 | T6 | T7>;\nexport function of<T, T2, T3, T4, T5, T6, T7, T8>(a: T, b: T2, c: T3, d: T4, e: T5, f: T6, g: T7, h: T8):\n  Observable<T | T2 | T3 | T4 | T5 | T6 | T7 | T8>;\nexport function of<T, T2, T3, T4, T5, T6, T7, T8, T9>(a: T, b: T2, c: T3, d: T4, e: T5, f: T6, g: T7, h: T8, i: T9):\n  Observable<T | T2 | T3 | T4 | T5 | T6 | T7 | T8 | T9>;\nexport function of<T>(...args: T[]): Observable<T>;\n/* tslint:enable:max-line-length */\n\n/**\n * Converts the arguments to an observable sequence.\n *\n * <span class=\"informal\">Each argument becomes a `next` notification.</span>\n *\n * ![](of.png)\n *\n * Unlike {@link from}, it does not do any flattening and emits each argument in whole\n * as a separate `next` notification.\n *\n * ## Examples\n *\n * Emit the values `10, 20, 30`\n *\n * ```ts\n * import { of } from 'rxjs';\n *\n * of(10, 20, 30)\n * .subscribe(\n *   next => console.log('next:', next),\n *   err => console.log('error:', err),\n *   () => console.log('the end'),\n * );\n * // result:\n * // 'next: 10'\n * // 'next: 20'\n * // 'next: 30'\n *\n * ```\n *\n * Emit the array `[1,2,3]`\n *\n * ```ts\n * import { of } from 'rxjs';\n *\n * of([1,2,3])\n * .subscribe(\n *   next => console.log('next:', next),\n *   err => console.log('error:', err),\n *   () => console.log('the end'),\n * );\n * // result:\n * // 'next: [1,2,3]'\n * ```\n *\n * @see {@link from}\n * @see {@link range}\n *\n * @param {...T} values A comma separated list of arguments you want to be emitted\n * @return {Observable} An Observable that emits the arguments\n * described above and then completes.\n * @method of\n * @owner Observable\n */\n\nexport function of<T>(...args: Array<T | SchedulerLike>): Observable<T> {\n  let scheduler = args[args.length - 1] as SchedulerLike;\n  if (isScheduler(scheduler)) {\n    args.pop();\n    return scheduleArray(args as T[], scheduler);\n  } else {\n    return fromArray(args as T[]);\n  }\n}\n","import { scheduleObservable } from './scheduleObservable';\nimport { schedulePromise } from './schedulePromise';\nimport { scheduleArray } from './scheduleArray';\nimport { scheduleIterable } from './scheduleIterable';\nimport { ObservableInput, SchedulerLike, Observable } from 'rxjs';\nimport { isInteropObservable } from '../util/isInteropObservable';\nimport { isPromise } from '../util/isPromise';\nimport { isArrayLike } from '../util/isArrayLike';\nimport { isIterable } from '../util/isIterable';\n\n/**\n * Converts from a common {@link ObservableInput} type to an observable where subscription and emissions\n * are scheduled on the provided scheduler.\n *\n * @see from\n * @see of\n *\n * @param input The observable, array, promise, iterable, etc you would like to schedule\n * @param scheduler The scheduler to use to schedule the subscription and emissions from\n * the returned observable.\n */\nexport function scheduled<T>(input: ObservableInput<T>, scheduler: SchedulerLike): Observable<T> {\n  if (input != null) {\n    if (isInteropObservable(input)) {\n      return scheduleObservable(input, scheduler);\n    } else if (isPromise(input)) {\n      return schedulePromise(input, scheduler);\n    } else if (isArrayLike(input)) {\n      return scheduleArray(input, scheduler);\n    }  else if (isIterable(input) || typeof input === 'string') {\n      return scheduleIterable(input, scheduler);\n    }\n  }\n\n  throw new TypeError((input !== null && typeof input || input) + ' is not observable');\n}\n","import { InteropObservable } from '../types';\nimport { observable as Symbol_observable } from '../symbol/observable';\n\n/** Identifies an input as being Observable (but not necessary an Rx Observable) */\nexport function isInteropObservable(input: any): input is InteropObservable<any> {\n  return input && typeof input[Symbol_observable] === 'function';\n}\n","import { Observable } from '../Observable';\nimport { Subscription } from '../Subscription';\nimport { observable as Symbol_observable } from '../symbol/observable';\nimport { InteropObservable, SchedulerLike, Subscribable } from '../types';\n\nexport function scheduleObservable<T>(input: InteropObservable<T>, scheduler: SchedulerLike) {\n  return new Observable<T>(subscriber => {\n    const sub = new Subscription();\n    sub.add(scheduler.schedule(() => {\n      const observable: Subscribable<T> = input[Symbol_observable]();\n      sub.add(observable.subscribe({\n        next(value) { sub.add(scheduler.schedule(() => subscriber.next(value))); },\n        error(err) { sub.add(scheduler.schedule(() => subscriber.error(err))); },\n        complete() { sub.add(scheduler.schedule(() => subscriber.complete())); },\n      }));\n    }));\n    return sub;\n  });\n}\n","import { Observable } from '../Observable';\nimport { SchedulerLike } from '../types';\nimport { Subscription } from '../Subscription';\n\nexport function schedulePromise<T>(input: PromiseLike<T>, scheduler: SchedulerLike) {\n  return new Observable<T>(subscriber => {\n    const sub = new Subscription();\n    sub.add(scheduler.schedule(() => input.then(\n      value => {\n        sub.add(scheduler.schedule(() => {\n          subscriber.next(value);\n          sub.add(scheduler.schedule(() => subscriber.complete()));\n        }));\n      },\n      err => {\n        sub.add(scheduler.schedule(() => subscriber.error(err)));\n      }\n    )));\n    return sub;\n  });\n}\n","import { iterator as Symbol_iterator } from '../symbol/iterator';\n\n/** Identifies an input as being an Iterable */\nexport function isIterable(input: any): input is Iterable<any> {\n  return input && typeof input[Symbol_iterator] === 'function';\n}\n","import { Observable } from '../Observable';\nimport { SchedulerLike } from '../types';\nimport { Subscription } from '../Subscription';\nimport { iterator as Symbol_iterator } from '../symbol/iterator';\n\nexport function scheduleIterable<T>(input: Iterable<T>, scheduler: SchedulerLike) {\n  if (!input) {\n    throw new Error('Iterable cannot be null');\n  }\n  return new Observable<T>(subscriber => {\n    const sub = new Subscription();\n    let iterator: Iterator<T>;\n    sub.add(() => {\n      // Finalize generators\n      if (iterator && typeof iterator.return === 'function') {\n        iterator.return();\n      }\n    });\n    sub.add(scheduler.schedule(() => {\n      iterator = input[Symbol_iterator]();\n      sub.add(scheduler.schedule(function () {\n        if (subscriber.closed) {\n          return;\n        }\n        let value: T;\n        let done: boolean;\n        try {\n          const result = iterator.next();\n          value = result.value;\n          done = result.done;\n        } catch (err) {\n          subscriber.error(err);\n          return;\n        }\n        if (done) {\n          subscriber.complete();\n        } else {\n          subscriber.next(value);\n          this.schedule();\n        }\n      }));\n    }));\n    return sub;\n  });\n}\n","import { Observable } from '../Observable';\nimport { subscribeTo } from '../util/subscribeTo';\nimport { ObservableInput, SchedulerLike, ObservedValueOf } from '../types';\nimport { scheduled } from '../scheduled/scheduled';\n\nexport function from<O extends ObservableInput<any>>(input: O): Observable<ObservedValueOf<O>>;\n/** @deprecated use {@link scheduled} instead. */\nexport function from<O extends ObservableInput<any>>(input: O, scheduler: SchedulerLike): Observable<ObservedValueOf<O>>;\n\n/**\n * Creates an Observable from an Array, an array-like object, a Promise, an iterable object, or an Observable-like object.\n *\n * <span class=\"informal\">Converts almost anything to an Observable.</span>\n *\n * ![](from.png)\n *\n * `from` converts various other objects and data types into Observables. It also converts a Promise, an array-like, or an\n * <a href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols#iterable\" target=\"_blank\">iterable</a>\n * object into an Observable that emits the items in that promise, array, or iterable. A String, in this context, is treated\n * as an array of characters. Observable-like objects (contains a function named with the ES2015 Symbol for Observable) can also be\n * converted through this operator.\n *\n * ## Examples\n *\n * ### Converts an array to an Observable\n *\n * ```ts\n * import { from } from 'rxjs';\n *\n * const array = [10, 20, 30];\n * const result = from(array);\n *\n * result.subscribe(x => console.log(x));\n *\n * // Logs:\n * // 10\n * // 20\n * // 30\n * ```\n *\n * ---\n *\n * ### Convert an infinite iterable (from a generator) to an Observable\n *\n * ```ts\n * import { from } from 'rxjs';\n * import { take } from 'rxjs/operators';\n *\n * function* generateDoubles(seed) {\n *    let i = seed;\n *    while (true) {\n *      yield i;\n *      i = 2 * i; // double it\n *    }\n * }\n *\n * const iterator = generateDoubles(3);\n * const result = from(iterator).pipe(take(10));\n *\n * result.subscribe(x => console.log(x));\n *\n * // Logs:\n * // 3\n * // 6\n * // 12\n * // 24\n * // 48\n * // 96\n * // 192\n * // 384\n * // 768\n * // 1536\n * ```\n *\n * ---\n *\n * ### With async scheduler\n *\n * ```ts\n * import { from, asyncScheduler } from 'rxjs';\n *\n * console.log('start');\n *\n * const array = [10, 20, 30];\n * const result = from(array, asyncScheduler);\n *\n * result.subscribe(x => console.log(x));\n *\n * console.log('end');\n *\n * // Logs:\n * // start\n * // end\n * // 10\n * // 20\n * // 30\n * ```\n *\n * @see {@link fromEvent}\n * @see {@link fromEventPattern}\n *\n * @param {ObservableInput<T>} A subscription object, a Promise, an Observable-like,\n * an Array, an iterable, or an array-like object to be converted.\n * @param {SchedulerLike} An optional {@link SchedulerLike} on which to schedule the emission of values.\n * @return {Observable<T>}\n * @name from\n * @owner Observable\n */\nexport function from<T>(input: ObservableInput<T>, scheduler?: SchedulerLike): Observable<T> {\n  if (!scheduler) {\n    if (input instanceof Observable) {\n      return input;\n    }\n    return new Observable<T>(subscribeTo(input));\n  } else {\n    return scheduled(input, scheduler);\n  }\n}\n","import { Subscriber } from './Subscriber';\nimport { OuterSubscriber } from './OuterSubscriber';\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nexport class InnerSubscriber<T, R> extends Subscriber<R> {\n  private index = 0;\n\n  constructor(private parent: OuterSubscriber<T, R>, public outerValue: T, public outerIndex: number) {\n    super();\n  }\n\n  protected _next(value: R): void {\n    this.parent.notifyNext(this.outerValue, value, this.outerIndex, this.index++, this);\n  }\n\n  protected _error(error: any): void {\n    this.parent.notifyError(error, this);\n    this.unsubscribe();\n  }\n\n  protected _complete(): void {\n    this.parent.notifyComplete(this);\n    this.unsubscribe();\n  }\n}\n","import { Subscriber } from './Subscriber';\nimport { InnerSubscriber } from './InnerSubscriber';\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nexport class OuterSubscriber<T, R> extends Subscriber<T> {\n  notifyNext(outerValue: T, innerValue: R,\n             outerIndex: number, innerIndex: number,\n             innerSub: InnerSubscriber<T, R>): void {\n    this.destination.next(innerValue);\n  }\n\n  notifyError(error: any, innerSub: InnerSubscriber<T, R>): void {\n    this.destination.error(error);\n  }\n\n  notifyComplete(innerSub: InnerSubscriber<T, R>): void {\n    this.destination.complete();\n  }\n}\n","import { Observable } from '../Observable';\nimport { Operator } from '../Operator';\nimport { Subscriber } from '../Subscriber';\nimport { Subscription } from '../Subscription';\nimport { subscribeToResult } from '../util/subscribeToResult';\nimport { OuterSubscriber } from '../OuterSubscriber';\nimport { InnerSubscriber } from '../InnerSubscriber';\nimport { ObservableInput, OperatorFunction, ObservedValueOf } from '../types';\nimport { map } from './map';\nimport { from } from '../observable/from';\n\n/* tslint:disable:max-line-length */\nexport function mergeMap<T, O extends ObservableInput<any>>(project: (value: T, index: number) => O, concurrent?: number): OperatorFunction<T, ObservedValueOf<O>>;\n/** @deprecated resultSelector no longer supported, use inner map instead */\nexport function mergeMap<T, O extends ObservableInput<any>>(project: (value: T, index: number) => O, resultSelector: undefined, concurrent?: number): OperatorFunction<T, ObservedValueOf<O>>;\n/** @deprecated resultSelector no longer supported, use inner map instead */\nexport function mergeMap<T, R, O extends ObservableInput<any>>(project: (value: T, index: number) => O, resultSelector: (outerValue: T, innerValue: ObservedValueOf<O>, outerIndex: number, innerIndex: number) => R, concurrent?: number): OperatorFunction<T, R>;\n/* tslint:enable:max-line-length */\n\n/**\n * Projects each source value to an Observable which is merged in the output\n * Observable.\n *\n * <span class=\"informal\">Maps each value to an Observable, then flattens all of\n * these inner Observables using {@link mergeAll}.</span>\n *\n * ![](mergeMap.png)\n *\n * Returns an Observable that emits items based on applying a function that you\n * supply to each item emitted by the source Observable, where that function\n * returns an Observable, and then merging those resulting Observables and\n * emitting the results of this merger.\n *\n * ## Example\n * Map and flatten each letter to an Observable ticking every 1 second\n * ```ts\n * import { of, interval } from 'rxjs';\n * import { mergeMap, map } from 'rxjs/operators';\n *\n * const letters = of('a', 'b', 'c');\n * const result = letters.pipe(\n *   mergeMap(x => interval(1000).pipe(map(i => x+i))),\n * );\n * result.subscribe(x => console.log(x));\n *\n * // Results in the following:\n * // a0\n * // b0\n * // c0\n * // a1\n * // b1\n * // c1\n * // continues to list a,b,c with respective ascending integers\n * ```\n *\n * @see {@link concatMap}\n * @see {@link exhaustMap}\n * @see {@link merge}\n * @see {@link mergeAll}\n * @see {@link mergeMapTo}\n * @see {@link mergeScan}\n * @see {@link switchMap}\n *\n * @param {function(value: T, ?index: number): ObservableInput} project A function\n * that, when applied to an item emitted by the source Observable, returns an\n * Observable.\n * @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of input\n * Observables being subscribed to concurrently.\n * @return {Observable} An Observable that emits the result of applying the\n * projection function (and the optional deprecated `resultSelector`) to each item\n * emitted by the source Observable and merging the results of the Observables\n * obtained from this transformation.\n * @method mergeMap\n * @owner Observable\n */\nexport function mergeMap<T, R, O extends ObservableInput<any>>(\n  project: (value: T, index: number) => O,\n  resultSelector?: ((outerValue: T, innerValue: ObservedValueOf<O>, outerIndex: number, innerIndex: number) => R) | number,\n  concurrent: number = Number.POSITIVE_INFINITY\n): OperatorFunction<T, ObservedValueOf<O>|R> {\n  if (typeof resultSelector === 'function') {\n    // DEPRECATED PATH\n    return (source: Observable<T>) => source.pipe(\n      mergeMap((a, i) => from(project(a, i)).pipe(\n        map((b: any, ii: number) => resultSelector(a, b, i, ii)),\n      ), concurrent)\n    );\n  } else if (typeof resultSelector === 'number') {\n    concurrent = resultSelector;\n  }\n  return (source: Observable<T>) => source.lift(new MergeMapOperator(project, concurrent));\n}\n\nexport class MergeMapOperator<T, R> implements Operator<T, R> {\n  constructor(private project: (value: T, index: number) => ObservableInput<R>,\n              private concurrent: number = Number.POSITIVE_INFINITY) {\n  }\n\n  call(observer: Subscriber<R>, source: any): any {\n    return source.subscribe(new MergeMapSubscriber(\n      observer, this.project, this.concurrent\n    ));\n  }\n}\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nexport class MergeMapSubscriber<T, R> extends OuterSubscriber<T, R> {\n  private hasCompleted: boolean = false;\n  private buffer: T[] = [];\n  private active: number = 0;\n  protected index: number = 0;\n\n  constructor(destination: Subscriber<R>,\n              private project: (value: T, index: number) => ObservableInput<R>,\n              private concurrent: number = Number.POSITIVE_INFINITY) {\n    super(destination);\n  }\n\n  protected _next(value: T): void {\n    if (this.active < this.concurrent) {\n      this._tryNext(value);\n    } else {\n      this.buffer.push(value);\n    }\n  }\n\n  protected _tryNext(value: T) {\n    let result: ObservableInput<R>;\n    const index = this.index++;\n    try {\n      result = this.project(value, index);\n    } catch (err) {\n      this.destination.error(err);\n      return;\n    }\n    this.active++;\n    this._innerSub(result, value, index);\n  }\n\n  private _innerSub(ish: ObservableInput<R>, value: T, index: number): void {\n    const innerSubscriber = new InnerSubscriber(this, value, index);\n    const destination = this.destination as Subscription;\n    destination.add(innerSubscriber);\n    const innerSubscription = subscribeToResult<T, R>(this, ish, undefined, undefined, innerSubscriber);\n    // The returned subscription will usually be the subscriber that was\n    // passed. However, interop subscribers will be wrapped and for\n    // unsubscriptions to chain correctly, the wrapper needs to be added, too.\n    if (innerSubscription !== innerSubscriber) {\n      destination.add(innerSubscription);\n    }\n  }\n\n  protected _complete(): void {\n    this.hasCompleted = true;\n    if (this.active === 0 && this.buffer.length === 0) {\n      this.destination.complete();\n    }\n    this.unsubscribe();\n  }\n\n  notifyNext(outerValue: T, innerValue: R,\n             outerIndex: number, innerIndex: number,\n             innerSub: InnerSubscriber<T, R>): void {\n    this.destination.next(innerValue);\n  }\n\n  notifyComplete(innerSub: Subscription): void {\n    const buffer = this.buffer;\n    this.remove(innerSub);\n    this.active--;\n    if (buffer.length > 0) {\n      this._next(buffer.shift());\n    } else if (this.active === 0 && this.hasCompleted) {\n      this.destination.complete();\n    }\n  }\n}\n","import { Subscription } from '../Subscription';\nimport { InnerSubscriber } from '../InnerSubscriber';\nimport { OuterSubscriber } from '../OuterSubscriber';\nimport { Subscriber } from '../Subscriber';\nimport { subscribeTo } from './subscribeTo';\nimport { Observable } from '../Observable';\n\nexport function subscribeToResult<T, R>(\n  outerSubscriber: OuterSubscriber<T, R>,\n  result: any,\n  outerValue: undefined,\n  outerIndex: undefined,\n  innerSubscriber: InnerSubscriber<T, R>\n): Subscription | undefined;\n\nexport function subscribeToResult<T, R>(\n  outerSubscriber: OuterSubscriber<T, R>,\n  result: any,\n  outerValue?: T,\n  outerIndex?: number\n): Subscription | undefined;\n\nexport function subscribeToResult<T, R>(\n  outerSubscriber: OuterSubscriber<T, R>,\n  result: any,\n  outerValue?: T,\n  outerIndex?: number,\n  innerSubscriber: Subscriber<R> = new InnerSubscriber(outerSubscriber, outerValue, outerIndex)\n): Subscription | undefined {\n  if (innerSubscriber.closed) {\n    return undefined;\n  }\n  if (result instanceof Observable) {\n    return result.subscribe(innerSubscriber);\n  }\n  return subscribeTo(result)(innerSubscriber) as Subscription;\n}\n","let _enable_super_gross_mode_that_will_cause_bad_things = false;\n\n/**\n * The global configuration object for RxJS, used to configure things\n * like what Promise contructor should used to create Promises\n */\nexport const config = {\n  /**\n   * The promise constructor used by default for methods such as\n   * {@link toPromise} and {@link forEach}\n   */\n  Promise: undefined as PromiseConstructorLike,\n\n  /**\n   * If true, turns on synchronous error rethrowing, which is a deprecated behavior\n   * in v6 and higher. This behavior enables bad patterns like wrapping a subscribe\n   * call in a try/catch block. It also enables producer interference, a nasty bug\n   * where a multicast can be broken for all observers by a downstream consumer with\n   * an unhandled error. DO NOT USE THIS FLAG UNLESS IT'S NEEDED TO BY TIME\n   * FOR MIGRATION REASONS.\n   */\n  set useDeprecatedSynchronousErrorHandling(value: boolean) {\n    if (value) {\n      const error = new Error();\n      console.warn('DEPRECATED! RxJS was set to use deprecated synchronous error handling behavior by code at: \\n' + error.stack);\n    } else if (_enable_super_gross_mode_that_will_cause_bad_things) {\n      console.log('RxJS: Back to a better error behavior. Thank you. <3');\n    }\n    _enable_super_gross_mode_that_will_cause_bad_things = value;\n  },\n\n  get useDeprecatedSynchronousErrorHandling() {\n    return _enable_super_gross_mode_that_will_cause_bad_things;\n  },\n};\n","/** Symbol.observable addition */\n/* Note: This will add Symbol.observable globally for all TypeScript users,\n  however, we are no longer polyfilling Symbol.observable */\ndeclare global {\n  interface SymbolConstructor {\n    readonly observable: symbol;\n  }\n}\n\n/** Symbol.observable or a string \"@@observable\". Used for interop */\nexport const observable = (() => typeof Symbol === 'function' && Symbol.observable || '@@observable')();\n","/**\n * Throws an error on another job so that it's picked up by the runtime's\n * uncaught error handling mechanism.\n * @param err the error to throw\n */\nexport function hostReportError(err: any) {\n  setTimeout(() => { throw err; }, 0);\n}","export function getSymbolIterator(): symbol {\n  if (typeof Symbol !== 'function' || !Symbol.iterator) {\n    return '@@iterator' as any;\n  }\n\n  return Symbol.iterator;\n}\n\nexport const iterator = getSymbolIterator();\n\n/**\n * @deprecated use {@link iterator} instead\n */\nexport const $$iterator = iterator;\n","import { Operator } from '../Operator';\nimport { Subscriber } from '../Subscriber';\nimport { Observable } from '../Observable';\nimport { OperatorFunction, MonoTypeOperatorFunction, TeardownLogic } from '../types';\n\n/* tslint:disable:max-line-length */\nexport function filter<T, S extends T>(predicate: (value: T, index: number) => value is S,\n                                       thisArg?: any): OperatorFunction<T, S>;\nexport function filter<T>(predicate: (value: T, index: number) => boolean,\n                          thisArg?: any): MonoTypeOperatorFunction<T>;\n/* tslint:enable:max-line-length */\n\n/**\n * Filter items emitted by the source Observable by only emitting those that\n * satisfy a specified predicate.\n *\n * <span class=\"informal\">Like\n * [Array.prototype.filter()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter),\n * it only emits a value from the source if it passes a criterion function.</span>\n *\n * ![](filter.png)\n *\n * Similar to the well-known `Array.prototype.filter` method, this operator\n * takes values from the source Observable, passes them through a `predicate`\n * function and only emits those values that yielded `true`.\n *\n * ## Example\n * Emit only click events whose target was a DIV element\n * ```ts\n * import { fromEvent } from 'rxjs';\n * import { filter } from 'rxjs/operators';\n *\n * const clicks = fromEvent(document, 'click');\n * const clicksOnDivs = clicks.pipe(filter(ev => ev.target.tagName === 'DIV'));\n * clicksOnDivs.subscribe(x => console.log(x));\n * ```\n *\n * @see {@link distinct}\n * @see {@link distinctUntilChanged}\n * @see {@link distinctUntilKeyChanged}\n * @see {@link ignoreElements}\n * @see {@link partition}\n * @see {@link skip}\n *\n * @param {function(value: T, index: number): boolean} predicate A function that\n * evaluates each value emitted by the source Observable. If it returns `true`,\n * the value is emitted, if `false` the value is not passed to the output\n * Observable. The `index` parameter is the number `i` for the i-th source\n * emission that has happened since the subscription, starting from the number\n * `0`.\n * @param {any} [thisArg] An optional argument to determine the value of `this`\n * in the `predicate` function.\n * @return {Observable} An Observable of values from the source that were\n * allowed by the `predicate` function.\n * @method filter\n * @owner Observable\n */\nexport function filter<T>(predicate: (value: T, index: number) => boolean,\n                          thisArg?: any): MonoTypeOperatorFunction<T> {\n  return function filterOperatorFunction(source: Observable<T>): Observable<T> {\n    return source.lift(new FilterOperator(predicate, thisArg));\n  };\n}\n\nclass FilterOperator<T> implements Operator<T, T> {\n  constructor(private predicate: (value: T, index: number) => boolean,\n              private thisArg?: any) {\n  }\n\n  call(subscriber: Subscriber<T>, source: any): TeardownLogic {\n    return source.subscribe(new FilterSubscriber(subscriber, this.predicate, this.thisArg));\n  }\n}\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nclass FilterSubscriber<T> extends Subscriber<T> {\n\n  count: number = 0;\n\n  constructor(destination: Subscriber<T>,\n              private predicate: (value: T, index: number) => boolean,\n              private thisArg: any) {\n    super(destination);\n  }\n\n  // the try catch block below is left specifically for\n  // optimization and perf reasons. a tryCatcher is not necessary here.\n  protected _next(value: T) {\n    let result: any;\n    try {\n      result = this.predicate.call(this.thisArg, value, this.count++);\n    } catch (err) {\n      this.destination.error(err);\n      return;\n    }\n    if (result) {\n      this.destination.next(value);\n    }\n  }\n}\n","export function identity<T>(x: T): T {\n  return x;\n}\n","\nimport { mergeMap } from './mergeMap';\nimport { identity } from '../util/identity';\nimport { OperatorFunction, ObservableInput } from '../types';\n\n/**\n * Converts a higher-order Observable into a first-order Observable which\n * concurrently delivers all values that are emitted on the inner Observables.\n *\n * <span class=\"informal\">Flattens an Observable-of-Observables.</span>\n *\n * ![](mergeAll.png)\n *\n * `mergeAll` subscribes to an Observable that emits Observables, also known as\n * a higher-order Observable. Each time it observes one of these emitted inner\n * Observables, it subscribes to that and delivers all the values from the\n * inner Observable on the output Observable. The output Observable only\n * completes once all inner Observables have completed. Any error delivered by\n * a inner Observable will be immediately emitted on the output Observable.\n *\n * ## Examples\n * Spawn a new interval Observable for each click event, and blend their outputs as one Observable\n * ```ts\n * import { fromEvent, interval } from 'rxjs';\n * import { map, mergeAll } from 'rxjs/operators';\n *\n * const clicks = fromEvent(document, 'click');\n * const higherOrder = clicks.pipe(map((ev) => interval(1000)));\n * const firstOrder = higherOrder.pipe(mergeAll());\n * firstOrder.subscribe(x => console.log(x));\n * ```\n *\n * Count from 0 to 9 every second for each click, but only allow 2 concurrent timers\n * ```ts\n * import { fromEvent, interval } from 'rxjs';\n * import { take, map, mergeAll } from 'rxjs/operators';\n *\n * const clicks = fromEvent(document, 'click');\n * const higherOrder = clicks.pipe(\n *   map((ev) => interval(1000).pipe(take(10))),\n * );\n * const firstOrder = higherOrder.pipe(mergeAll(2));\n * firstOrder.subscribe(x => console.log(x));\n * ```\n *\n * @see {@link combineAll}\n * @see {@link concatAll}\n * @see {@link exhaust}\n * @see {@link merge}\n * @see {@link mergeMap}\n * @see {@link mergeMapTo}\n * @see {@link mergeScan}\n * @see {@link switchAll}\n * @see {@link switchMap}\n * @see {@link zipAll}\n *\n * @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of inner\n * Observables being subscribed to concurrently.\n * @return {Observable} An Observable that emits values coming from all the\n * inner Observables emitted by the source Observable.\n * @method mergeAll\n * @owner Observable\n */\nexport function mergeAll<T>(concurrent: number = Number.POSITIVE_INFINITY): OperatorFunction<ObservableInput<T>, T> {\n  return mergeMap(identity, concurrent);\n}\n","import { Observable } from '../Observable';\nimport { ObservableInput, SchedulerLike} from '../types';\nimport { isScheduler } from '../util/isScheduler';\nimport { mergeAll } from '../operators/mergeAll';\nimport { fromArray } from './fromArray';\n\n/* tslint:disable:max-line-length */\n/** @deprecated use {@link scheduled} and {@link mergeAll} (e.g. `scheduled([ob1, ob2, ob3], scheduled).pipe(mergeAll())*/\nexport function merge<T>(v1: ObservableInput<T>, scheduler: SchedulerLike): Observable<T>;\n/** @deprecated use {@link scheduled} and {@link mergeAll} (e.g. `scheduled([ob1, ob2, ob3], scheduled).pipe(mergeAll())*/\nexport function merge<T>(v1: ObservableInput<T>, concurrent: number, scheduler: SchedulerLike): Observable<T>;\n/** @deprecated use {@link scheduled} and {@link mergeAll} (e.g. `scheduled([ob1, ob2, ob3], scheduled).pipe(mergeAll())*/\nexport function merge<T, T2>(v1: ObservableInput<T>, v2: ObservableInput<T2>, scheduler: SchedulerLike): Observable<T | T2>;\n/** @deprecated use {@link scheduled} and {@link mergeAll} (e.g. `scheduled([ob1, ob2, ob3], scheduled).pipe(mergeAll())*/\nexport function merge<T, T2>(v1: ObservableInput<T>, v2: ObservableInput<T2>, concurrent: number, scheduler: SchedulerLike): Observable<T | T2>;\n/** @deprecated use {@link scheduled} and {@link mergeAll} (e.g. `scheduled([ob1, ob2, ob3], scheduled).pipe(mergeAll())*/\nexport function merge<T, T2, T3>(v1: ObservableInput<T>, v2: ObservableInput<T2>, v3: ObservableInput<T3>, scheduler: SchedulerLike): Observable<T | T2 | T3>;\n/** @deprecated use {@link scheduled} and {@link mergeAll} (e.g. `scheduled([ob1, ob2, ob3], scheduled).pipe(mergeAll())*/\nexport function merge<T, T2, T3>(v1: ObservableInput<T>, v2: ObservableInput<T2>, v3: ObservableInput<T3>, concurrent: number, scheduler: SchedulerLike): Observable<T | T2 | T3>;\n/** @deprecated use {@link scheduled} and {@link mergeAll} (e.g. `scheduled([ob1, ob2, ob3], scheduled).pipe(mergeAll())*/\nexport function merge<T, T2, T3, T4>(v1: ObservableInput<T>, v2: ObservableInput<T2>, v3: ObservableInput<T3>, v4: ObservableInput<T4>, scheduler: SchedulerLike): Observable<T | T2 | T3 | T4>;\n/** @deprecated use {@link scheduled} and {@link mergeAll} (e.g. `scheduled([ob1, ob2, ob3], scheduled).pipe(mergeAll())*/\nexport function merge<T, T2, T3, T4>(v1: ObservableInput<T>, v2: ObservableInput<T2>, v3: ObservableInput<T3>, v4: ObservableInput<T4>, concurrent: number, scheduler: SchedulerLike): Observable<T | T2 | T3 | T4>;\n/** @deprecated use {@link scheduled} and {@link mergeAll} (e.g. `scheduled([ob1, ob2, ob3], scheduled).pipe(mergeAll())*/\nexport function merge<T, T2, T3, T4, T5>(v1: ObservableInput<T>, v2: ObservableInput<T2>, v3: ObservableInput<T3>, v4: ObservableInput<T4>, v5: ObservableInput<T5>, scheduler: SchedulerLike): Observable<T | T2 | T3 | T4 | T5>;\n/** @deprecated use {@link scheduled} and {@link mergeAll} (e.g. `scheduled([ob1, ob2, ob3], scheduled).pipe(mergeAll())*/\nexport function merge<T, T2, T3, T4, T5>(v1: ObservableInput<T>, v2: ObservableInput<T2>, v3: ObservableInput<T3>, v4: ObservableInput<T4>, v5: ObservableInput<T5>, concurrent: number, scheduler: SchedulerLike): Observable<T | T2 | T3 | T4 | T5>;\n/** @deprecated use {@link scheduled} and {@link mergeAll} (e.g. `scheduled([ob1, ob2, ob3], scheduled).pipe(mergeAll())*/\nexport function merge<T, T2, T3, T4, T5, T6>(v1: ObservableInput<T>, v2: ObservableInput<T2>, v3: ObservableInput<T3>, v4: ObservableInput<T4>, v5: ObservableInput<T5>, v6: ObservableInput<T6>, scheduler: SchedulerLike): Observable<T | T2 | T3 | T4 | T5 | T6>;\n/** @deprecated use {@link scheduled} and {@link mergeAll} (e.g. `scheduled([ob1, ob2, ob3], scheduled).pipe(mergeAll())*/\nexport function merge<T, T2, T3, T4, T5, T6>(v1: ObservableInput<T>, v2: ObservableInput<T2>, v3: ObservableInput<T3>, v4: ObservableInput<T4>, v5: ObservableInput<T5>, v6: ObservableInput<T6>, concurrent: number, scheduler: SchedulerLike): Observable<T | T2 | T3 | T4 | T5 | T6>;\n\nexport function merge<T>(v1: ObservableInput<T>): Observable<T>;\nexport function merge<T>(v1: ObservableInput<T>, concurrent?: number): Observable<T>;\nexport function merge<T, T2>(v1: ObservableInput<T>, v2: ObservableInput<T2>): Observable<T | T2>;\nexport function merge<T, T2>(v1: ObservableInput<T>, v2: ObservableInput<T2>, concurrent?: number): Observable<T | T2>;\nexport function merge<T, T2, T3>(v1: ObservableInput<T>, v2: ObservableInput<T2>, v3: ObservableInput<T3>): Observable<T | T2 | T3>;\nexport function merge<T, T2, T3>(v1: ObservableInput<T>, v2: ObservableInput<T2>, v3: ObservableInput<T3>, concurrent?: number): Observable<T | T2 | T3>;\nexport function merge<T, T2, T3, T4>(v1: ObservableInput<T>, v2: ObservableInput<T2>, v3: ObservableInput<T3>, v4: ObservableInput<T4>): Observable<T | T2 | T3 | T4>;\nexport function merge<T, T2, T3, T4>(v1: ObservableInput<T>, v2: ObservableInput<T2>, v3: ObservableInput<T3>, v4: ObservableInput<T4>, concurrent?: number): Observable<T | T2 | T3 | T4>;\nexport function merge<T, T2, T3, T4, T5>(v1: ObservableInput<T>, v2: ObservableInput<T2>, v3: ObservableInput<T3>, v4: ObservableInput<T4>, v5: ObservableInput<T5>): Observable<T | T2 | T3 | T4 | T5>;\nexport function merge<T, T2, T3, T4, T5>(v1: ObservableInput<T>, v2: ObservableInput<T2>, v3: ObservableInput<T3>, v4: ObservableInput<T4>, v5: ObservableInput<T5>, concurrent?: number): Observable<T | T2 | T3 | T4 | T5>;\nexport function merge<T, T2, T3, T4, T5, T6>(v1: ObservableInput<T>, v2: ObservableInput<T2>, v3: ObservableInput<T3>, v4: ObservableInput<T4>, v5: ObservableInput<T5>, v6: ObservableInput<T6>): Observable<T | T2 | T3 | T4 | T5 | T6>;\nexport function merge<T, T2, T3, T4, T5, T6>(v1: ObservableInput<T>, v2: ObservableInput<T2>, v3: ObservableInput<T3>, v4: ObservableInput<T4>, v5: ObservableInput<T5>, v6: ObservableInput<T6>, concurrent?: number): Observable<T | T2 | T3 | T4 | T5 | T6>;\nexport function merge<T>(...observables: (ObservableInput<T> | number)[]): Observable<T>;\n/** @deprecated use {@link scheduled} and {@link mergeAll} (e.g. `scheduled([ob1, ob2, ob3], scheduled).pipe(mergeAll())*/\nexport function merge<T>(...observables: (ObservableInput<T> | SchedulerLike | number)[]): Observable<T>;\nexport function merge<T, R>(...observables: (ObservableInput<any> | number)[]): Observable<R>;\n/** @deprecated use {@link scheduled} and {@link mergeAll} (e.g. `scheduled([ob1, ob2, ob3], scheduled).pipe(mergeAll())*/\nexport function merge<T, R>(...observables: (ObservableInput<any> | SchedulerLike | number)[]): Observable<R>;\n/* tslint:enable:max-line-length */\n/**\n * Creates an output Observable which concurrently emits all values from every\n * given input Observable.\n *\n * <span class=\"informal\">Flattens multiple Observables together by blending\n * their values into one Observable.</span>\n *\n * ![](merge.png)\n *\n * `merge` subscribes to each given input Observable (as arguments), and simply\n * forwards (without doing any transformation) all the values from all the input\n * Observables to the output Observable. The output Observable only completes\n * once all input Observables have completed. Any error delivered by an input\n * Observable will be immediately emitted on the output Observable.\n *\n * ## Examples\n * ### Merge together two Observables: 1s interval and clicks\n * ```ts\n * import { merge, fromEvent, interval } from 'rxjs';\n *\n * const clicks = fromEvent(document, 'click');\n * const timer = interval(1000);\n * const clicksOrTimer = merge(clicks, timer);\n * clicksOrTimer.subscribe(x => console.log(x));\n *\n * // Results in the following:\n * // timer will emit ascending values, one every second(1000ms) to console\n * // clicks logs MouseEvents to console everytime the \"document\" is clicked\n * // Since the two streams are merged you see these happening\n * // as they occur.\n * ```\n *\n * ### Merge together 3 Observables, but only 2 run concurrently\n * ```ts\n * import { merge, interval } from 'rxjs';\n * import { take } from 'rxjs/operators';\n *\n * const timer1 = interval(1000).pipe(take(10));\n * const timer2 = interval(2000).pipe(take(6));\n * const timer3 = interval(500).pipe(take(10));\n * const concurrent = 2; // the argument\n * const merged = merge(timer1, timer2, timer3, concurrent);\n * merged.subscribe(x => console.log(x));\n *\n * // Results in the following:\n * // - First timer1 and timer2 will run concurrently\n * // - timer1 will emit a value every 1000ms for 10 iterations\n * // - timer2 will emit a value every 2000ms for 6 iterations\n * // - after timer1 hits it's max iteration, timer2 will\n * //   continue, and timer3 will start to run concurrently with timer2\n * // - when timer2 hits it's max iteration it terminates, and\n * //   timer3 will continue to emit a value every 500ms until it is complete\n * ```\n *\n * @see {@link mergeAll}\n * @see {@link mergeMap}\n * @see {@link mergeMapTo}\n * @see {@link mergeScan}\n *\n * @param {...ObservableInput} observables Input Observables to merge together.\n * @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of input\n * Observables being subscribed to concurrently.\n * @param {SchedulerLike} [scheduler=null] The {@link SchedulerLike} to use for managing\n * concurrency of input Observables.\n * @return {Observable} an Observable that emits items that are the result of\n * every input Observable.\n * @static true\n * @name merge\n * @owner Observable\n */\nexport function merge<T, R>(...observables: Array<ObservableInput<any> | SchedulerLike | number>): Observable<R> {\n let concurrent = Number.POSITIVE_INFINITY;\n let scheduler: SchedulerLike = null;\n  let last: any = observables[observables.length - 1];\n  if (isScheduler(last)) {\n    scheduler = <SchedulerLike>observables.pop();\n    if (observables.length > 1 && typeof observables[observables.length - 1] === 'number') {\n      concurrent = <number>observables.pop();\n    }\n  } else if (typeof last === 'number') {\n    concurrent = <number>observables.pop();\n  }\n\n  if (scheduler === null && observables.length === 1 && observables[0] instanceof Observable) {\n    return <Observable<R>>observables[0];\n  }\n\n  return mergeAll<R>(concurrent)(fromArray<any>(observables, scheduler));\n}\n","import { Operator } from '../Operator';\nimport { Subscriber } from '../Subscriber';\nimport { Observable } from '../Observable';\nimport { OperatorFunction } from '../types';\n\n/**\n * Emits the given constant value on the output Observable every time the source\n * Observable emits a value.\n *\n * <span class=\"informal\">Like {@link map}, but it maps every source value to\n * the same output value every time.</span>\n *\n * ![](mapTo.png)\n *\n * Takes a constant `value` as argument, and emits that whenever the source\n * Observable emits a value. In other words, ignores the actual source value,\n * and simply uses the emission moment to know when to emit the given `value`.\n *\n * ## Example\n * Map every click to the string 'Hi'\n * ```ts\n * import { fromEvent } from 'rxjs';\n * import { mapTo } from 'rxjs/operators';\n *\n * const clicks = fromEvent(document, 'click');\n * const greetings = clicks.pipe(mapTo('Hi'));\n * greetings.subscribe(x => console.log(x));\n * ```\n *\n * @see {@link map}\n *\n * @param {any} value The value to map each source value to.\n * @return {Observable} An Observable that emits the given `value` every time\n * the source Observable emits something.\n * @method mapTo\n * @owner Observable\n */\nexport function mapTo<T, R>(value: R): OperatorFunction<T, R> {\n  return (source: Observable<T>) => source.lift(new MapToOperator(value));\n}\n\nclass MapToOperator<T, R> implements Operator<T, R> {\n\n  value: R;\n\n  constructor(value: R) {\n    this.value = value;\n  }\n\n  call(subscriber: Subscriber<R>, source: any): any {\n    return source.subscribe(new MapToSubscriber(subscriber, this.value));\n  }\n}\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nclass MapToSubscriber<T, R> extends Subscriber<T> {\n\n  value: R;\n\n  constructor(destination: Subscriber<R>, value: R) {\n    super(destination);\n    this.value = value;\n  }\n\n  protected _next(x: T) {\n    this.destination.next(this.value);\n  }\n}\n","let nextHandle = 1;\nconst RESOLVED = (() => Promise.resolve())();\nconst activeHandles: { [key: number]: any } = {};\n\n/**\n * Finds the handle in the list of active handles, and removes it.\n * Returns `true` if found, `false` otherwise. Used both to clear\n * Immediate scheduled tasks, and to identify if a task should be scheduled.\n */\nfunction findAndClearHandle(handle: number): boolean {\n  if (handle in activeHandles) {\n    delete activeHandles[handle];\n    return true;\n  }\n  return false;\n}\n\n/**\n * Helper functions to schedule and unschedule microtasks.\n */\nexport const Immediate = {\n  setImmediate(cb: () => void): number {\n    const handle = nextHandle++;\n    activeHandles[handle] = true;\n    RESOLVED.then(() => findAndClearHandle(handle) && cb());\n    return handle;\n  },\n\n  clearImmediate(handle: number): void {\n    findAndClearHandle(handle);\n  },\n};\n\n/**\n * Used for internal testing purposes only. Do not export from library.\n */\nexport const TestTools = {\n  pending() {\n    return Object.keys(activeHandles).length;\n  }\n};\n","import { Immediate } from '../util/Immediate';\nimport { AsyncAction } from './AsyncAction';\nimport { AsapScheduler } from './AsapScheduler';\nimport { SchedulerAction } from '../types';\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nexport class AsapAction<T> extends AsyncAction<T> {\n\n  constructor(protected scheduler: AsapScheduler,\n              protected work: (this: SchedulerAction<T>, state?: T) => void) {\n    super(scheduler, work);\n  }\n\n  protected requestAsyncId(scheduler: AsapScheduler, id?: any, delay: number = 0): any {\n    // If delay is greater than 0, request as an async action.\n    if (delay !== null && delay > 0) {\n      return super.requestAsyncId(scheduler, id, delay);\n    }\n    // Push the action to the end of the scheduler queue.\n    scheduler.actions.push(this);\n    // If a microtask has already been scheduled, don't schedule another\n    // one. If a microtask hasn't been scheduled yet, schedule one now. Return\n    // the current scheduled microtask id.\n    return scheduler.scheduled || (scheduler.scheduled = Immediate.setImmediate(\n      scheduler.flush.bind(scheduler, null)\n    ));\n  }\n  protected recycleAsyncId(scheduler: AsapScheduler, id?: any, delay: number = 0): any {\n    // If delay exists and is greater than 0, or if the delay is null (the\n    // action wasn't rescheduled) but was originally scheduled as an async\n    // action, then recycle as an async action.\n    if ((delay !== null && delay > 0) || (delay === null && this.delay > 0)) {\n      return super.recycleAsyncId(scheduler, id, delay);\n    }\n    // If the scheduler queue is empty, cancel the requested microtask and\n    // set the scheduled flag to undefined so the next AsapAction will schedule\n    // its own.\n    if (scheduler.actions.length === 0) {\n      Immediate.clearImmediate(id);\n      scheduler.scheduled = undefined;\n    }\n    // Return undefined so the action knows to request a new async id if it's rescheduled.\n    return undefined;\n  }\n}\n","import { AsyncAction } from './AsyncAction';\nimport { AsyncScheduler } from './AsyncScheduler';\n\nexport class AsapScheduler extends AsyncScheduler {\n  public flush(action?: AsyncAction<any>): void {\n\n    this.active = true;\n    this.scheduled = undefined;\n\n    const {actions} = this;\n    let error: any;\n    let index: number = -1;\n    let count: number = actions.length;\n    action = action || actions.shift();\n\n    do {\n      if (error = action.execute(action.state, action.delay)) {\n        break;\n      }\n    } while (++index < count && (action = actions.shift()));\n\n    this.active = false;\n\n    if (error) {\n      while (++index < count && (action = actions.shift())) {\n        action.unsubscribe();\n      }\n      throw error;\n    }\n  }\n}\n","import { SchedulerLike, SchedulerAction } from '../types';\nimport { Subscriber } from '../Subscriber';\nimport { Subscription } from '../Subscription';\nimport { Observable } from '../Observable';\nimport { asap } from '../scheduler/asap';\nimport { isNumeric } from '../util/isNumeric';\n\nexport interface DispatchArg<T> {\n  source: Observable<T>;\n  subscriber: Subscriber<T>;\n}\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @extends {Ignored}\n * @hide true\n */\nexport class SubscribeOnObservable<T> extends Observable<T> {\n  /** @nocollapse */\n  static create<T>(source: Observable<T>, delay: number = 0, scheduler: SchedulerLike = asap): Observable<T> {\n    return new SubscribeOnObservable(source, delay, scheduler);\n  }\n\n  /** @nocollapse */\n  static dispatch<T>(this: SchedulerAction<T>, arg: DispatchArg<T>): Subscription {\n    const { source, subscriber } = arg;\n    return this.add(source.subscribe(subscriber));\n  }\n\n  constructor(public source: Observable<T>,\n              private delayTime: number = 0,\n              private scheduler: SchedulerLike = asap) {\n    super();\n    if (!isNumeric(delayTime) || delayTime < 0) {\n      this.delayTime = 0;\n    }\n    if (!scheduler || typeof scheduler.schedule !== 'function') {\n      this.scheduler = asap;\n    }\n  }\n\n  /** @deprecated This is an internal implementation detail, do not use. */\n  _subscribe(subscriber: Subscriber<T>) {\n    const delay = this.delayTime;\n    const source = this.source;\n    const scheduler = this.scheduler;\n\n    return scheduler.schedule<DispatchArg<any>>(SubscribeOnObservable.dispatch, delay, {\n      source, subscriber\n    });\n  }\n}\n","import { isArray } from './isArray';\n\nexport function isNumeric(val: any): val is number | string {\n  // parseFloat NaNs numeric-cast false positives (null|true|false|\"\")\n  // ...but misinterprets leading-number strings, particularly hex literals (\"0x...\")\n  // subtraction forces infinities to NaN\n  // adding 1 corrects loss of precision from parseFloat (#15100)\n  return !isArray(val) && (val - parseFloat(val) + 1) >= 0;\n}\n","import { Operator } from '../Operator';\nimport { Subscriber } from '../Subscriber';\nimport { Observable } from '../Observable';\nimport { SubscribeOnObservable } from '../observable/SubscribeOnObservable';\nimport { MonoTypeOperatorFunction, SchedulerLike, TeardownLogic } from '../types';\n\n/**\n * Asynchronously subscribes Observers to this Observable on the specified {@link SchedulerLike}.\n *\n * With `subscribeOn` you can decide what type of scheduler a specific Observable will be using when it is subscribed to.\n *\n * Schedulers control the speed and order of emissions to observers from an Observable stream.\n *\n * ![](subscribeOn.png)\n *\n * ## Example\n * Given the following code:\n * ```javascript\n * import { of, merge } from 'rxjs';\n *\n * const a = of(1, 2, 3, 4);\n * const b = of(5, 6, 7, 8, 9);\n * merge(a, b).subscribe(console.log);\n * ```\n *\n * Both Observable `a` and `b` will emit their values directly and synchronously once they are subscribed to.\n * This will result in the output of `1 2 3 4 5 6 7 8 9`.\n *\n * But if we instead us the `subscribeOn` operator declaring that we want to use the {@link asyncScheduler} for values emited by Observable `a`:\n * ```javascript\n * import { of, merge, asyncScheduler } from 'rxjs';\n * import { subscribeOn } from 'rxjs/operators';\n *\n * const a = of(1, 2, 3, 4).pipe(subscribeOn(asyncScheduler));\n * const b = of(5, 6, 7, 8, 9);\n * merge(a, b).subscribe(console.log);\n * ```\n *\n * The output will instead be `5 6 7 8 9 1 2 3 4`.\n * The reason for this is that Observable `b` emits its values directly and synchronously like before\n * but the emissions from `a` are scheduled on the event loop because we are now using the {@link asyncScheduler} for that specific Observable.\n *\n * @param {SchedulerLike} scheduler - The {@link SchedulerLike} to perform subscription actions on.\n * @return {Observable<T>} The source Observable modified so that its subscriptions happen on the specified {@link SchedulerLike}.\n .\n * @method subscribeOn\n * @owner Observable\n */\nexport function subscribeOn<T>(scheduler: SchedulerLike, delay: number = 0): MonoTypeOperatorFunction<T> {\n  return function subscribeOnOperatorFunction(source: Observable<T>): Observable<T> {\n    return source.lift(new SubscribeOnOperator<T>(scheduler, delay));\n  };\n}\n\nclass SubscribeOnOperator<T> implements Operator<T, T> {\n  constructor(private scheduler: SchedulerLike,\n              private delay: number) {\n  }\n  call(subscriber: Subscriber<T>, source: any): TeardownLogic {\n    return new SubscribeOnObservable<T>(\n      source, this.delay, this.scheduler\n    ).subscribe(subscriber);\n  }\n}\n","import { Observable } from '../Observable';\nimport { SchedulerLike } from '../types';\n\n/**\n * The same Observable instance returned by any call to {@link empty} without a\n * `scheduler`. It is preferrable to use this over `empty()`.\n */\nexport const EMPTY = new Observable<never>(subscriber => subscriber.complete());\n\n/**\n * Creates an Observable that emits no items to the Observer and immediately\n * emits a complete notification.\n *\n * <span class=\"informal\">Just emits 'complete', and nothing else.\n * </span>\n *\n * ![](empty.png)\n *\n * This static operator is useful for creating a simple Observable that only\n * emits the complete notification. It can be used for composing with other\n * Observables, such as in a {@link mergeMap}.\n *\n * ## Examples\n * ### Emit the number 7, then complete\n * ```ts\n * import { empty } from 'rxjs';\n * import { startWith } from 'rxjs/operators';\n *\n * const result = empty().pipe(startWith(7));\n * result.subscribe(x => console.log(x));\n * ```\n *\n * ### Map and flatten only odd numbers to the sequence 'a', 'b', 'c'\n * ```ts\n * import { empty, interval, of } from 'rxjs';\n * import { mergeMap } from 'rxjs/operators';\n *\n * const interval$ = interval(1000);\n * const result = interval$.pipe(\n *   mergeMap(x => x % 2 === 1 ? of('a', 'b', 'c') : empty()),\n * );\n * result.subscribe(x => console.log(x));\n *\n * // Results in the following to the console:\n * // x is equal to the count on the interval eg(0,1,2,3,...)\n * // x will occur every 1000ms\n * // if x % 2 is equal to 1 print abc\n * // if x % 2 is not equal to 1 nothing will be output\n * ```\n *\n * @see {@link Observable}\n * @see {@link never}\n * @see {@link of}\n * @see {@link throwError}\n *\n * @param scheduler A {@link SchedulerLike} to use for scheduling\n * the emission of the complete notification.\n * @return An \"empty\" Observable: emits only the complete\n * notification.\n * @deprecated Deprecated in favor of using {@link EMPTY} constant, or {@link scheduled} (e.g. `scheduled([], scheduler)`)\n */\nexport function empty(scheduler?: SchedulerLike) {\n  return scheduler ? emptyScheduled(scheduler) : EMPTY;\n}\n\nfunction emptyScheduled(scheduler: SchedulerLike) {\n  return new Observable<never>(subscriber => scheduler.schedule(() => subscriber.complete()));\n}\n","import { PartialObserver } from './types';\nimport { Observable } from './Observable';\nimport { empty } from './observable/empty';\nimport { of } from './observable/of';\nimport { throwError } from './observable/throwError';\nimport { deprecate } from 'util';\n\n// TODO: When this enum is removed, replace it with a type alias. See #4556.\n/**\n * @deprecated NotificationKind is deprecated as const enums are not compatible with isolated modules. Use a string literal instead.\n */\nexport enum NotificationKind {\n  NEXT = 'N',\n  ERROR = 'E',\n  COMPLETE = 'C',\n}\n\n/**\n * Represents a push-based event or value that an {@link Observable} can emit.\n * This class is particularly useful for operators that manage notifications,\n * like {@link materialize}, {@link dematerialize}, {@link observeOn}, and\n * others. Besides wrapping the actual delivered value, it also annotates it\n * with metadata of, for instance, what type of push message it is (`next`,\n * `error`, or `complete`).\n *\n * @see {@link materialize}\n * @see {@link dematerialize}\n * @see {@link observeOn}\n *\n * @class Notification<T>\n */\nexport class Notification<T> {\n  hasValue: boolean;\n\n  constructor(public kind: 'N' | 'E' | 'C', public value?: T, public error?: any) {\n    this.hasValue = kind === 'N';\n  }\n\n  /**\n   * Delivers to the given `observer` the value wrapped by this Notification.\n   * @param {Observer} observer\n   * @return\n   */\n  observe(observer: PartialObserver<T>): any {\n    switch (this.kind) {\n      case 'N':\n        return observer.next && observer.next(this.value);\n      case 'E':\n        return observer.error && observer.error(this.error);\n      case 'C':\n        return observer.complete && observer.complete();\n    }\n  }\n\n  /**\n   * Given some {@link Observer} callbacks, deliver the value represented by the\n   * current Notification to the correctly corresponding callback.\n   * @param {function(value: T): void} next An Observer `next` callback.\n   * @param {function(err: any): void} [error] An Observer `error` callback.\n   * @param {function(): void} [complete] An Observer `complete` callback.\n   * @return {any}\n   */\n  do(next: (value: T) => void, error?: (err: any) => void, complete?: () => void): any {\n    const kind = this.kind;\n    switch (kind) {\n      case 'N':\n        return next && next(this.value);\n      case 'E':\n        return error && error(this.error);\n      case 'C':\n        return complete && complete();\n    }\n  }\n\n  /**\n   * Takes an Observer or its individual callback functions, and calls `observe`\n   * or `do` methods accordingly.\n   * @param {Observer|function(value: T): void} nextOrObserver An Observer or\n   * the `next` callback.\n   * @param {function(err: any): void} [error] An Observer `error` callback.\n   * @param {function(): void} [complete] An Observer `complete` callback.\n   * @return {any}\n   */\n  accept(nextOrObserver: PartialObserver<T> | ((value: T) => void), error?: (err: any) => void, complete?: () => void) {\n    if (nextOrObserver && typeof (<PartialObserver<T>>nextOrObserver).next === 'function') {\n      return this.observe(<PartialObserver<T>>nextOrObserver);\n    } else {\n      return this.do(<(value: T) => void>nextOrObserver, error, complete);\n    }\n  }\n\n  /**\n   * Returns a simple Observable that just delivers the notification represented\n   * by this Notification instance.\n   * @return {any}\n   */\n  toObservable(): Observable<T> {\n    const kind = this.kind;\n    switch (kind) {\n      case 'N':\n        return of(this.value);\n      case 'E':\n        return throwError(this.error);\n      case 'C':\n        return empty();\n    }\n    throw new Error('unexpected notification kind value');\n  }\n\n  private static completeNotification: Notification<any> = new Notification('C');\n  private static undefinedValueNotification: Notification<any> = new Notification('N', undefined);\n\n  /**\n   * A shortcut to create a Notification instance of the type `next` from a\n   * given value.\n   * @param {T} value The `next` value.\n   * @return {Notification<T>} The \"next\" Notification representing the\n   * argument.\n   * @nocollapse\n   */\n  static createNext<T>(value: T): Notification<T> {\n    if (typeof value !== 'undefined') {\n      return new Notification('N', value);\n    }\n    return Notification.undefinedValueNotification;\n  }\n\n  /**\n   * A shortcut to create a Notification instance of the type `error` from a\n   * given error.\n   * @param {any} [err] The `error` error.\n   * @return {Notification<T>} The \"error\" Notification representing the\n   * argument.\n   * @nocollapse\n   */\n  static createError<T>(err?: any): Notification<T> {\n    return new Notification('E', undefined, err);\n  }\n\n  /**\n   * A shortcut to create a Notification instance of the type `complete`.\n   * @return {Notification<any>} The valueless \"complete\" Notification.\n   * @nocollapse\n   */\n  static createComplete(): Notification<any> {\n    return Notification.completeNotification;\n  }\n}\n","import { Observable } from '../Observable';\nimport { SchedulerLike } from '../types';\nimport { Subscriber } from '../Subscriber';\n\n/**\n * Creates an Observable that emits no items to the Observer and immediately\n * emits an error notification.\n *\n * <span class=\"informal\">Just emits 'error', and nothing else.\n * </span>\n *\n * ![](throw.png)\n *\n * This static operator is useful for creating a simple Observable that only\n * emits the error notification. It can be used for composing with other\n * Observables, such as in a {@link mergeMap}.\n *\n * ## Examples\n * ### Emit the number 7, then emit an error\n * ```ts\n * import { throwError, concat, of } from 'rxjs';\n *\n * const result = concat(of(7), throwError(new Error('oops!')));\n * result.subscribe(x => console.log(x), e => console.error(e));\n *\n * // Logs:\n * // 7\n * // Error: oops!\n * ```\n *\n * ---\n *\n * ### Map and flatten numbers to the sequence 'a', 'b', 'c', but throw an error for 2\n * ```ts\n * import { throwError, interval, of } from 'rxjs';\n * import { mergeMap } from 'rxjs/operators';\n *\n * interval(1000).pipe(\n *   mergeMap(x => x === 2\n *     ? throwError('Twos are bad')\n *     : of('a', 'b', 'c')\n *   ),\n * ).subscribe(x => console.log(x), e => console.error(e));\n *\n * // Logs:\n * // a\n * // b\n * // c\n * // a\n * // b\n * // c\n * // Twos are bad\n * ```\n *\n * @see {@link Observable}\n * @see {@link empty}\n * @see {@link never}\n * @see {@link of}\n *\n * @param {any} error The particular Error to pass to the error notification.\n * @param {SchedulerLike} [scheduler] A {@link SchedulerLike} to use for scheduling\n * the emission of the error notification.\n * @return {Observable} An error Observable: emits only the error notification\n * using the given error argument.\n * @static true\n * @name throwError\n * @owner Observable\n */\nexport function throwError(error: any, scheduler?: SchedulerLike): Observable<never> {\n  if (!scheduler) {\n    return new Observable(subscriber => subscriber.error(error));\n  } else {\n    return new Observable(subscriber => scheduler.schedule(dispatch, 0, { error, subscriber }));\n  }\n}\n\ninterface DispatchArg {\n  error: any;\n  subscriber: Subscriber<any>;\n}\n\nfunction dispatch({ error, subscriber }: DispatchArg) {\n  subscriber.error(error);\n}\n","import { Observable } from '../Observable';\nimport { Operator } from '../Operator';\nimport { Subscriber } from '../Subscriber';\nimport { Subscription } from '../Subscription';\nimport { Notification } from '../Notification';\nimport { MonoTypeOperatorFunction, PartialObserver, SchedulerAction, SchedulerLike, TeardownLogic } from '../types';\n\n/**\n *\n * Re-emits all notifications from source Observable with specified scheduler.\n *\n * <span class=\"informal\">Ensure a specific scheduler is used, from outside of an Observable.</span>\n *\n * `observeOn` is an operator that accepts a scheduler as a first parameter, which will be used to reschedule\n * notifications emitted by the source Observable. It might be useful, if you do not have control over\n * internal scheduler of a given Observable, but want to control when its values are emitted nevertheless.\n *\n * Returned Observable emits the same notifications (nexted values, complete and error events) as the source Observable,\n * but rescheduled with provided scheduler. Note that this doesn't mean that source Observables internal\n * scheduler will be replaced in any way. Original scheduler still will be used, but when the source Observable emits\n * notification, it will be immediately scheduled again - this time with scheduler passed to `observeOn`.\n * An anti-pattern would be calling `observeOn` on Observable that emits lots of values synchronously, to split\n * that emissions into asynchronous chunks. For this to happen, scheduler would have to be passed into the source\n * Observable directly (usually into the operator that creates it). `observeOn` simply delays notifications a\n * little bit more, to ensure that they are emitted at expected moments.\n *\n * As a matter of fact, `observeOn` accepts second parameter, which specifies in milliseconds with what delay notifications\n * will be emitted. The main difference between {@link delay} operator and `observeOn` is that `observeOn`\n * will delay all notifications - including error notifications - while `delay` will pass through error\n * from source Observable immediately when it is emitted. In general it is highly recommended to use `delay` operator\n * for any kind of delaying of values in the stream, while using `observeOn` to specify which scheduler should be used\n * for notification emissions in general.\n *\n * ## Example\n * Ensure values in subscribe are called just before browser repaint.\n * ```ts\n * import { interval } from 'rxjs';\n * import { observeOn } from 'rxjs/operators';\n *\n * const intervals = interval(10);                // Intervals are scheduled\n *                                                // with async scheduler by default...\n * intervals.pipe(\n *   observeOn(animationFrameScheduler),          // ...but we will observe on animationFrame\n * )                                              // scheduler to ensure smooth animation.\n * .subscribe(val => {\n *   someDiv.style.height = val + 'px';\n * });\n * ```\n *\n * @see {@link delay}\n *\n * @param {SchedulerLike} scheduler Scheduler that will be used to reschedule notifications from source Observable.\n * @param {number} [delay] Number of milliseconds that states with what delay every notification should be rescheduled.\n * @return {Observable<T>} Observable that emits the same notifications as the source Observable,\n * but with provided scheduler.\n *\n * @method observeOn\n * @owner Observable\n */\nexport function observeOn<T>(scheduler: SchedulerLike, delay: number = 0): MonoTypeOperatorFunction<T> {\n  return function observeOnOperatorFunction(source: Observable<T>): Observable<T> {\n    return source.lift(new ObserveOnOperator(scheduler, delay));\n  };\n}\n\nexport class ObserveOnOperator<T> implements Operator<T, T> {\n  constructor(private scheduler: SchedulerLike, private delay: number = 0) {\n  }\n\n  call(subscriber: Subscriber<T>, source: any): TeardownLogic {\n    return source.subscribe(new ObserveOnSubscriber(subscriber, this.scheduler, this.delay));\n  }\n}\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nexport class ObserveOnSubscriber<T> extends Subscriber<T> {\n  /** @nocollapse */\n  static dispatch(this: SchedulerAction<ObserveOnMessage>, arg: ObserveOnMessage) {\n    const { notification, destination } = arg;\n    notification.observe(destination);\n    this.unsubscribe();\n  }\n\n  constructor(destination: Subscriber<T>,\n              private scheduler: SchedulerLike,\n              private delay: number = 0) {\n    super(destination);\n  }\n\n  private scheduleMessage(notification: Notification<any>): void {\n    const destination = this.destination as Subscription;\n    destination.add(this.scheduler.schedule(\n      ObserveOnSubscriber.dispatch,\n      this.delay,\n      new ObserveOnMessage(notification, this.destination)\n    ));\n  }\n\n  protected _next(value: T): void {\n    this.scheduleMessage(Notification.createNext(value));\n  }\n\n  protected _error(err: any): void {\n    this.scheduleMessage(Notification.createError(err));\n    this.unsubscribe();\n  }\n\n  protected _complete(): void {\n    this.scheduleMessage(Notification.createComplete());\n    this.unsubscribe();\n  }\n}\n\nexport class ObserveOnMessage {\n  constructor(public notification: Notification<any>,\n              public destination: PartialObserver<any>) {\n  }\n}\n","import { AsyncAction } from './AsyncAction';\nimport { Subscription } from '../Subscription';\nimport { QueueScheduler } from './QueueScheduler';\nimport { SchedulerAction } from '../types';\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nexport class QueueAction<T> extends AsyncAction<T> {\n\n  constructor(protected scheduler: QueueScheduler,\n              protected work: (this: SchedulerAction<T>, state?: T) => void) {\n    super(scheduler, work);\n  }\n\n  public schedule(state?: T, delay: number = 0): Subscription {\n    if (delay > 0) {\n      return super.schedule(state, delay);\n    }\n    this.delay = delay;\n    this.state = state;\n    this.scheduler.flush(this);\n    return this;\n  }\n\n  public execute(state: T, delay: number): any {\n    return (delay > 0 || this.closed) ?\n      super.execute(state, delay) :\n      this._execute(state, delay) ;\n  }\n\n  protected requestAsyncId(scheduler: QueueScheduler, id?: any, delay: number = 0): any {\n    // If delay exists and is greater than 0, or if the delay is null (the\n    // action wasn't rescheduled) but was originally scheduled as an async\n    // action, then recycle as an async action.\n    if ((delay !== null && delay > 0) || (delay === null && this.delay > 0)) {\n      return super.requestAsyncId(scheduler, id, delay);\n    }\n    // Otherwise flush the scheduler starting with this action.\n    return scheduler.flush(this);\n  }\n}\n","import { AsyncScheduler } from './AsyncScheduler';\n\nexport class QueueScheduler extends AsyncScheduler {\n}\n","import { QueueAction } from './QueueAction';\nimport { QueueScheduler } from './QueueScheduler';\n\n/**\n *\n * Queue Scheduler\n *\n * <span class=\"informal\">Put every next task on a queue, instead of executing it immediately</span>\n *\n * `queue` scheduler, when used with delay, behaves the same as {@link asyncScheduler} scheduler.\n *\n * When used without delay, it schedules given task synchronously - executes it right when\n * it is scheduled. However when called recursively, that is when inside the scheduled task,\n * another task is scheduled with queue scheduler, instead of executing immediately as well,\n * that task will be put on a queue and wait for current one to finish.\n *\n * This means that when you execute task with `queue` scheduler, you are sure it will end\n * before any other task scheduled with that scheduler will start.\n *\n * ## Examples\n * Schedule recursively first, then do something\n * ```ts\n * import { queueScheduler } from 'rxjs';\n *\n * queueScheduler.schedule(() => {\n *   queueScheduler.schedule(() => console.log('second')); // will not happen now, but will be put on a queue\n *\n *   console.log('first');\n * });\n *\n * // Logs:\n * // \"first\"\n * // \"second\"\n * ```\n *\n * Reschedule itself recursively\n * ```ts\n * import { queueScheduler } from 'rxjs';\n *\n * queueScheduler.schedule(function(state) {\n *   if (state !== 0) {\n *     console.log('before', state);\n *     this.schedule(state - 1); // `this` references currently executing Action,\n *                               // which we reschedule with new state\n *     console.log('after', state);\n *   }\n * }, 0, 3);\n *\n * // In scheduler that runs recursively, you would expect:\n * // \"before\", 3\n * // \"before\", 2\n * // \"before\", 1\n * // \"after\", 1\n * // \"after\", 2\n * // \"after\", 3\n *\n * // But with queue it logs:\n * // \"before\", 3\n * // \"after\", 3\n * // \"before\", 2\n * // \"after\", 2\n * // \"before\", 1\n * // \"after\", 1\n * ```\n *\n * @static true\n * @name queue\n * @owner Scheduler\n */\n\nexport const queue = new QueueScheduler(QueueAction);\n","export interface ObjectUnsubscribedError extends Error {\n}\n\nexport interface ObjectUnsubscribedErrorCtor {\n  new(): ObjectUnsubscribedError;\n}\n\nconst ObjectUnsubscribedErrorImpl = (() => {\n  function ObjectUnsubscribedErrorImpl(this: any) {\n    Error.call(this);\n    this.message = 'object unsubscribed';\n    this.name = 'ObjectUnsubscribedError';\n    return this;\n  }\n\n  ObjectUnsubscribedErrorImpl.prototype = Object.create(Error.prototype);\n\n  return ObjectUnsubscribedErrorImpl;\n})();\n\n/**\n * An error thrown when an action is invalid because the object has been\n * unsubscribed.\n *\n * @see {@link Subject}\n * @see {@link BehaviorSubject}\n *\n * @class ObjectUnsubscribedError\n */\nexport const ObjectUnsubscribedError: ObjectUnsubscribedErrorCtor = ObjectUnsubscribedErrorImpl as any;","import { Subject } from './Subject';\nimport { Observer } from './types';\nimport { Subscription } from './Subscription';\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nexport class SubjectSubscription<T> extends Subscription {\n  closed: boolean = false;\n\n  constructor(public subject: Subject<T>, public subscriber: Observer<T>) {\n    super();\n  }\n\n  unsubscribe() {\n    if (this.closed) {\n      return;\n    }\n\n    this.closed = true;\n\n    const subject = this.subject;\n    const observers = subject.observers;\n\n    this.subject = null;\n\n    if (!observers || observers.length === 0 || subject.isStopped || subject.closed) {\n      return;\n    }\n\n    const subscriberIndex = observers.indexOf(this.subscriber);\n\n    if (subscriberIndex !== -1) {\n      observers.splice(subscriberIndex, 1);\n    }\n  }\n}\n","import { Operator } from './Operator';\nimport { Observable } from './Observable';\nimport { Subscriber } from './Subscriber';\nimport { Subscription } from './Subscription';\nimport { Observer, SubscriptionLike, TeardownLogic } from './types';\nimport { ObjectUnsubscribedError } from './util/ObjectUnsubscribedError';\nimport { SubjectSubscription } from './SubjectSubscription';\nimport { rxSubscriber as rxSubscriberSymbol } from '../internal/symbol/rxSubscriber';\n\n/**\n * @class SubjectSubscriber<T>\n */\nexport class SubjectSubscriber<T> extends Subscriber<T> {\n  constructor(protected destination: Subject<T>) {\n    super(destination);\n  }\n}\n\n/**\n * A Subject is a special type of Observable that allows values to be\n * multicasted to many Observers. Subjects are like EventEmitters.\n *\n * Every Subject is an Observable and an Observer. You can subscribe to a\n * Subject, and you can call next to feed values as well as error and complete.\n *\n * @class Subject<T>\n */\nexport class Subject<T> extends Observable<T> implements SubscriptionLike {\n\n  [rxSubscriberSymbol]() {\n    return new SubjectSubscriber(this);\n  }\n\n  observers: Observer<T>[] = [];\n\n  closed = false;\n\n  isStopped = false;\n\n  hasError = false;\n\n  thrownError: any = null;\n\n  constructor() {\n    super();\n  }\n\n  /**@nocollapse\n   * @deprecated use new Subject() instead\n  */\n  static create: Function = <T>(destination: Observer<T>, source: Observable<T>): AnonymousSubject<T> => {\n    return new AnonymousSubject<T>(destination, source);\n  }\n\n  lift<R>(operator: Operator<T, R>): Observable<R> {\n    const subject = new AnonymousSubject(this, this);\n    subject.operator = <any>operator;\n    return <any>subject;\n  }\n\n  next(value?: T) {\n    if (this.closed) {\n      throw new ObjectUnsubscribedError();\n    }\n    if (!this.isStopped) {\n      const { observers } = this;\n      const len = observers.length;\n      const copy = observers.slice();\n      for (let i = 0; i < len; i++) {\n        copy[i].next(value);\n      }\n    }\n  }\n\n  error(err: any) {\n    if (this.closed) {\n      throw new ObjectUnsubscribedError();\n    }\n    this.hasError = true;\n    this.thrownError = err;\n    this.isStopped = true;\n    const { observers } = this;\n    const len = observers.length;\n    const copy = observers.slice();\n    for (let i = 0; i < len; i++) {\n      copy[i].error(err);\n    }\n    this.observers.length = 0;\n  }\n\n  complete() {\n    if (this.closed) {\n      throw new ObjectUnsubscribedError();\n    }\n    this.isStopped = true;\n    const { observers } = this;\n    const len = observers.length;\n    const copy = observers.slice();\n    for (let i = 0; i < len; i++) {\n      copy[i].complete();\n    }\n    this.observers.length = 0;\n  }\n\n  unsubscribe() {\n    this.isStopped = true;\n    this.closed = true;\n    this.observers = null;\n  }\n\n  /** @deprecated This is an internal implementation detail, do not use. */\n  _trySubscribe(subscriber: Subscriber<T>): TeardownLogic {\n    if (this.closed) {\n      throw new ObjectUnsubscribedError();\n    } else {\n      return super._trySubscribe(subscriber);\n    }\n  }\n\n  /** @deprecated This is an internal implementation detail, do not use. */\n  _subscribe(subscriber: Subscriber<T>): Subscription {\n    if (this.closed) {\n      throw new ObjectUnsubscribedError();\n    } else if (this.hasError) {\n      subscriber.error(this.thrownError);\n      return Subscription.EMPTY;\n    } else if (this.isStopped) {\n      subscriber.complete();\n      return Subscription.EMPTY;\n    } else {\n      this.observers.push(subscriber);\n      return new SubjectSubscription(this, subscriber);\n    }\n  }\n\n  /**\n   * Creates a new Observable with this Subject as the source. You can do this\n   * to create customize Observer-side logic of the Subject and conceal it from\n   * code that uses the Observable.\n   * @return {Observable} Observable that the Subject casts to\n   */\n  asObservable(): Observable<T> {\n    const observable = new Observable<T>();\n    (<any>observable).source = this;\n    return observable;\n  }\n}\n\n/**\n * @class AnonymousSubject<T>\n */\nexport class AnonymousSubject<T> extends Subject<T> {\n  constructor(protected destination?: Observer<T>, source?: Observable<T>) {\n    super();\n    this.source = source;\n  }\n\n  next(value: T) {\n    const { destination } = this;\n    if (destination && destination.next) {\n      destination.next(value);\n    }\n  }\n\n  error(err: any) {\n    const { destination } = this;\n    if (destination && destination.error) {\n      this.destination.error(err);\n    }\n  }\n\n  complete() {\n    const { destination } = this;\n    if (destination && destination.complete) {\n      this.destination.complete();\n    }\n  }\n\n  /** @deprecated This is an internal implementation detail, do not use. */\n  _subscribe(subscriber: Subscriber<T>): Subscription {\n    const { source } = this;\n    if (source) {\n      return this.source.subscribe(subscriber);\n    } else {\n      return Subscription.EMPTY;\n    }\n  }\n}\n","/** @deprecated do not use, this is no longer checked by RxJS internals */\nexport const rxSubscriber = (() =>\n  typeof Symbol === 'function'\n    ? Symbol('rxSubscriber')\n    : '@@rxSubscriber_' + Math.random())();\n\n/**\n * @deprecated use rxSubscriber instead\n */\nexport const $$rxSubscriber = rxSubscriber;\n","import { Observable } from '../Observable';\nimport { SchedulerLike } from '../types';\nimport { Subscription } from '../Subscription';\n\nexport function scheduleArray<T>(input: ArrayLike<T>, scheduler: SchedulerLike) {\n  return new Observable<T>(subscriber => {\n    const sub = new Subscription();\n    let i = 0;\n    sub.add(scheduler.schedule(function () {\n      if (i === input.length) {\n        subscriber.complete();\n        return;\n      }\n      subscriber.next(input[i++]);\n      if (!subscriber.closed) {\n        sub.add(this.schedule());\n      }\n    }));\n    return sub;\n  });\n}\n","import { Observer } from './types';\nimport { config } from './config';\nimport { hostReportError } from './util/hostReportError';\n\nexport const empty: Observer<any> = {\n  closed: true,\n  next(value: any): void { /* noop */},\n  error(err: any): void {\n    if (config.useDeprecatedSynchronousErrorHandling) {\n      throw err;\n    } else {\n      hostReportError(err);\n    }\n  },\n  complete(): void { /*noop*/ }\n};\n","export function isFunction(x: any): x is Function {\n  return typeof x === 'function';\n}\n"],"sourceRoot":""}