fetchye-core/lib/useSubscription.js

Core components of the Fetchye library

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

var _react = require("react");

/*
 * Copyright 2020 American Express Travel Related Services Company, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */
const useSubscription = () => {
  const subscribers = (0, _react.useRef)(new Set());
  return [function notify() {
    subscribers.current.forEach(callback => {
      callback();
    });
  }, function subscribe(callback) {
    subscribers.current.add(callback);
    return () => {
      subscribers.current.delete(callback);
    };
  }];
};

var _default = useSubscription;
exports.default = _default;