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

	/**
	* Reducer for actions that may result in an event being logged via statsv.
	*
	* @param {Object\|undefined} state
	* @param {Object} action
	* @return {Object} state after action
	*/
	export default function statsv( state, action ) {
	state = state \|\| {};

	switch ( action.type ) {
	case actionTypes.FETCH_START:
	return nextState( state, {
	fetchStartedAt: action.timestamp
	} );

	case actionTypes.FETCH_END:
	return nextState( state, {
	action: 'timing.PagePreviewsApiResponse',
	data: action.timestamp - state.fetchStartedAt
	} );

	case actionTypes.FETCH_FAILED:
	return nextState( state, {
	action: 'counter.PagePreviewsApiFailure',
	data: 1
	} );

	case actionTypes.LINK_DWELL:
	return nextState( state, {
	linkDwellStartedAt: action.timestamp
	} );

	case actionTypes.PREVIEW_SHOW:
	return nextState( state, {
	action: 'timing.PagePreviewsPreviewShow',
	data: action.timestamp - state.linkDwellStartedAt
	} );

	case actionTypes.STATSV_LOGGED:
	return nextState( state, {
	action: null,
	data: null
	} );

	default:
	return state;
	}
	}