{"ast":null,"code":"import { isArray } from './util/isArray';\nimport { isObject } from './util/isObject';\nimport { isFunction } from './util/isFunction';\nimport { UnsubscriptionError } from './util/UnsubscriptionError';\nexport class Subscription {\n  constructor(unsubscribe) {\n    this.closed = false;\n    this._parentOrParents = null;\n    this._subscriptions = null;\n    if (unsubscribe) {\n      this._unsubscribe = unsubscribe;\n    }\n  }\n  unsubscribe() {\n    let errors;\n    if (this.closed) {\n      return;\n    }\n    let {\n      _parentOrParents,\n      _unsubscribe,\n      _subscriptions\n    } = this;\n    this.closed = true;\n    this._parentOrParents = null;\n    this._subscriptions = null;\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    if (isFunction(_unsubscribe)) {\n      try {\n        _unsubscribe.call(this);\n      } catch (e) {\n        errors = e instanceof UnsubscriptionError ? flattenUnsubscriptionErrors(e.errors) : [e];\n      }\n    }\n    if (isArray(_subscriptions)) {\n      let index = -1;\n      let len = _subscriptions.length;\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    if (errors) {\n      throw new UnsubscriptionError(errors);\n    }\n  }\n  add(teardown) {\n    let subscription = teardown;\n    if (!teardown) {\n      return Subscription.EMPTY;\n    }\n    switch (typeof teardown) {\n      case 'function':\n        subscription = new Subscription(teardown);\n      case 'object':\n        if (subscription === this || subscription.closed || typeof subscription.unsubscribe !== 'function') {\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        {\n          throw new Error('unrecognized teardown ' + teardown + ' added to Subscription.');\n        }\n    }\n    let {\n      _parentOrParents\n    } = subscription;\n    if (_parentOrParents === null) {\n      subscription._parentOrParents = this;\n    } else if (_parentOrParents instanceof Subscription) {\n      if (_parentOrParents === this) {\n        return subscription;\n      }\n      subscription._parentOrParents = [_parentOrParents, this];\n    } else if (_parentOrParents.indexOf(this) === -1) {\n      _parentOrParents.push(this);\n    } else {\n      return subscription;\n    }\n    const subscriptions = this._subscriptions;\n    if (subscriptions === null) {\n      this._subscriptions = [subscription];\n    } else {\n      subscriptions.push(subscription);\n    }\n    return subscription;\n  }\n  remove(subscription) {\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}\nSubscription.EMPTY = function (empty) {\n  empty.closed = true;\n  return empty;\n}(new Subscription());\nfunction flattenUnsubscriptionErrors(errors) {\n  return errors.reduce((errs, err) => errs.concat(err instanceof UnsubscriptionError ? 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