redux-restate/lib/subscribe.js

<div align="center"> <h1>redux-restate</h1> <br/> <img src="https://cdn.rawgit.com/theKashey/restate/1d67d86d/images/logo.svg" alt="restate" width="600" align="center"> <br/> <br/> Restate base layer. <br/> <br/> <a href="https://circlec

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
var createSubscription = function createSubscription() {
  var nextListeners = [];

  return {
    trigger: function trigger() {
      var listeners = nextListeners;
      for (var i = 0; i < listeners.length; i++) {
        listeners[i]();
      }
    },
    subscribe: function subscribe(listener) {
      if (typeof listener !== 'function') {
        throw new Error('Expected listener to be a function.');
      }

      var isSubscribed = true;

      nextListeners.push(listener);

      return function unsubscribe() {
        if (!isSubscribed) {
          return;
        }

        isSubscribed = false;

        var index = nextListeners.indexOf(listener);
        nextListeners.splice(index, 1);
      };
    }
  };
};

exports.default = createSubscription;