pageviews.js
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pageviews.js
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	/**
	* @module reducers/pageviews
	* @private
	*/

	import actionTypes from '../actionTypes';
	import nextState from './nextState';

	/**
	* Reducer for actions that queues and clears events for
	* being logged as virtual pageviews [0]
	*
	* [0]: https://meta.wikimedia.org/wiki/Schema:VirtualPageViews
	*
	* @param {Object\|undefined} state
	* @param {Object} action
	* @return {Object} The state resulting from reducing the action with the
	* current state
	*/
	export default function pageviews( state, action ) {
	if ( state === undefined ) {
	state = {
	pageview: undefined
	};
	}

	switch ( action.type ) {
	case actionTypes.BOOT:
	return nextState( state, {
	page: action.page
	} );
	case actionTypes.PAGEVIEW_LOGGED:
	return nextState( state, {
	pageview: undefined
	} );
	case actionTypes.PREVIEW_SEEN:
	return nextState( state, {
	pageview: {
	/* eslint-disable camelcase */
	page_title: action.title,
	page_id: action.pageId,
	page_namespace: action.namespace
	/* eslint-enable camelcase */
	}
	} );
	default:
	return state;
	}
	}