registerStore

after.js

/**
 * WordPress dependencies
 */
import { registerStore } from '@wordpress/data';

/**
 * Internal dependencies
 */
import reducer from './reducer';
import * as actions from './actions';
import * as selectors from './selectors';

export default registerStore( 'core/viewport', {
  reducer,
  actions,
  selectors,
} );

before.js

/**
 * WordPress dependencies
 */
import {
	registerReducer,
	registerActions,
	registerSelectors,
} from '@wordpress/data';

/**
 * Internal dependencies
 */
import reducer from './reducer';
import * as actions from './actions';
import * as selectors from './selectors';

const store = registerReducer( 'core/viewport', reducer );

registerSelectors( 'core/viewport', selectors );
registerActions( 'core/viewport', actions );

export default store;