/* harmony export */ __webpack_require__.d(__webpack_exports__, {
/* harmony export */   "Z": () => (/* binding */ Subscription)
/* harmony export */ });
/* harmony import */ var _batch__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(9256);
 // encapsulates the subscription logic for connecting a component to the redux store, as
// well as nesting subscriptions of descendant components, so that we can ensure the
// ancestor components re-render before descendants

var CLEARED = null;
var nullListeners = {
  notify: function notify() {}
};

function createListenerCollection() {
  var batch = (0,_batch__WEBPACK_IMPORTED_MODULE_0__/* .getBatch */ .k)(); // the current/next pattern is copied from redux's createStore code.
  // TODO: refactor+expose that code to be reusable here?

  var current = [];
  var next = [];
  return {
    clear: function clear() {
      next = CLEARED;
      current = CLEARED;
    },
    notify: function notify() {
      var listeners = current = next;
      batch(function () {
        for (var i = 0; i < listeners.length; i++) {
          listeners[i]();
        }
      });
    },
    get: function get() {
      return next;
    },
    subscribe: function subscribe(listener) {
      var isSubscribed = true;
      if (next === current) next = current.slice();
      next.push(listener);
      return function unsubscribe() {
        if (!isSubscribed || current === CLEARED) return;
        isSubscribed = false;
        if (next === current) next = current.slice();
        next.splice(next.indexOf(listener), 1);
      };
    }
  };
}

var Subscription =
/*#__PURE__*/
function () {
  function Subscription(store, parentSub) {
    this.store = store;
    this.parentSub = parentSub;
    this.unsubscribe = null;
    this.listeners = nullListeners;
    this.handleChangeWrapper = this.handleChangeWrapper.bind(this);
  }

  var _proto = Subscription.prototype;

  _proto.addNestedSub = function addNestedSub(listener) {
    this.trySubscribe();
    return this.listeners.subscribe(listener);
  };

  _proto.notifyNestedSubs = function notifyNestedSubs() {
    this.listeners.notify();
  };

  _proto.handleChangeWrapper = function handleChangeWrapper() {
    if (this.onStateChange) {
      this.onStateChange();
    }
  };

  _proto.isSubscribed = function isSubscribed() {
    return Boolean(this.unsubscribe);
  };

  _proto.trySubscribe = function trySubscribe() {
    if (!this.unsubscribe) {
      this.unsubscribe = this.parentSub ? this.parentSub.addNestedSub(this.handleChangeWrapper) : this.store.subscribe(this.handleChangeWrapper);
      this.listeners = createListenerCollection();
    }
  };

  _proto.tryUnsubscribe = function tryUnsubscribe() {
    if (this.unsubscribe) {
      this.unsubscribe();
      this.unsubscribe = null;
      this.listeners.clear();
      this.listeners = nullListeners;
    }
  };

  return Subscription;
}();

//# sourceURL=[module]
//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
//# sourceURL=webpack-internal:///6496