constants.js
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constants.js
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	import bracketedPixelRatio from './bracketedPixelRatio';

	const bpr = bracketedPixelRatio();

	// See the following for context around this value.
	//
	// * https://phabricator.wikimedia.org/T161284
	// * https://phabricator.wikimedia.org/T70861#3129780
	export const FETCH_START_DELAY = 150; // ms.
	// The delay after which a FETCH_COMPLETE action should be dispatched.
	//
	// If the API endpoint responds faster than 350 ms (or, say, the API
	// response is served from the UA's cache), then we introduce a delay of
	// 350 ms - t to make the preview delay consistent to the user. The total
	// delay from start to finish is 500 ms.
	export const FETCH_COMPLETE_TARGET_DELAY = 350 + FETCH_START_DELAY; // ms.
	// The minimum time a preview must be open before we judge it
	// has been seen.
	// See https://phabricator.wikimedia.org/T184793
	export const PREVIEW_SEEN_DURATION = 1000; // ms
	export const ABANDON_END_DELAY = 300;

	export default {
	BRACKETED_DEVICE_PIXEL_RATIO: bpr,
	// See https://phabricator.wikimedia.org/T272169: requesting a larger thumbnail to avoid bluriness
	THUMBNAIL_SIZE: 320 * Math.max( bpr, 1.5 ),
	EXTRACT_LENGTH: 525
	};