page.js
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page.js
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	import constants from '../constants';
	import createMediaWikiApiGateway from './mediawiki';
	import createRESTBaseGateway from './rest';
	import * as formatters from './restFormatters';
	import { abortablePromise } from './index.js';

	/**
	* @module gateway/page
	* @private
	*/
	/**
	* @param {Object} options
	* @return {Promise}
	*/
	function ajax( options ) {
	const controller = new AbortController();
	const signal = controller.signal;

	return abortablePromise(
	fetch( options.url, {
	headers: options.headers,
	signal
	} ).then( ( resp ) => resp.json() ),
	() => {
	controller.abort();
	}
	);
	}

	/**
	* Creates a page preview gateway with sensible values for the dependencies.
	*
	* @param {mw.Map} config
	* @return {Gateway}
	*/
	export default function createPagePreviewGateway( config ) {
	const gatewayConfig = Object.assign( {}, constants, {
	acceptLanguage: config.get( 'wgPageContentLanguage' )
	} );
	const restConfig = Object.assign( {}, gatewayConfig, {
	endpoint: config.get( 'wgPopupsRestGatewayEndpoint' )
	} );
	switch ( config.get( 'wgPopupsGateway' ) ) {
	case 'mwApiPlain':
	return createMediaWikiApiGateway( new mw.Api(), gatewayConfig );
	case 'restbasePlain':
	return createRESTBaseGateway(
	ajax, restConfig, formatters.parsePlainTextResponse );
	case 'restbaseHTML':
	return createRESTBaseGateway(
	ajax, restConfig, formatters.parseHTMLResponse );
	default:
	throw new Error( 'Unknown gateway' );
	}
	}