		@@ -6,3 +6,3 @@ 'use strict';
		});
		exports.AddonStore = undefined;
		exports.AddonStore = exports.mockChannel = undefined;

		@@ -21,4 +21,15 @@ var _keys = require('babel-runtime/core-js/object/keys');

		var _global = require('global');

		var _global2 = _interopRequireDefault(_global);

		var _storybookChannelMock = require('./storybook-channel-mock');

		var _storybookChannelMock2 = _interopRequireDefault(_storybookChannelMock);

		function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

		// Resolves to window in browser and to global in node
		exports.mockChannel = _storybookChannelMock2.default;

		var AddonStore = exports.AddonStore = function () {
		@@ -38,4 +49,3 @@ function AddonStore() {
		value: function getChannel() {
		// this.channel should get overwritten by setChannel if package versions are
		// correct and AddonStore is a proper singleton. If not, throw.
		// this.channel should get overwritten by setChannel. If it wasn't called (e.g. in non-browser environment), throw.
		if (!this.channel) {
		@@ -101,2 +111,13 @@ throw new Error('Accessing nonexistent addons channel, see https://storybook.js.org/basics/faq/#why-is-there-no-addons-channel');

		exports.default = new AddonStore();
		// Enforce addons store to be a singleton


		var KEY = '__STORYBOOK_ADDONS';
		function getAddonsStore() {
		if (!_global2.default[KEY]) {
		_global2.default[KEY] = new AddonStore();
		}
		return _global2.default[KEY];
		}

		exports.default = getAddonsStore();

package.json

		{
		"name": "@storybook/addons",
		"version": "4.0.0-alpha.1",
		"version": "4.0.0-alpha.2",
		"description": "Storybook addons store",
		@@ -21,3 +21,7 @@ "keywords": [
		"prepare": "node ../../scripts/prepare.js"
		},
		"dependencies": {
		"@storybook/channels": "4.0.0-alpha.2",
		"global": "^4.3.2"
		}
		}

src/index.js

		@@ -0,1 +1,6 @@
		// Resolves to window in browser and to global in node
		import global from 'global';

		export mockChannel from './storybook-channel-mock';

		export class AddonStore {
		@@ -11,4 +16,3 @@ constructor() {
		getChannel() {
		// this.channel should get overwritten by setChannel if package versions are
		// correct and AddonStore is a proper singleton. If not, throw.
		// this.channel should get overwritten by setChannel. If it wasn't called (e.g. in non-browser environment), throw.
		if (!this.channel) {
		@@ -61,2 +65,11 @@ throw new Error(

		export default new AddonStore();
		// Enforce addons store to be a singleton
		const KEY = '__STORYBOOK_ADDONS';
		function getAddonsStore() {
		if (!global[KEY]) {
		global[KEY] = new AddonStore();
		}
		return global[KEY];
		}

		export default getAddonsStore();

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