Add undefined guard for window.devicePixelRatio (#5324)

SeanSobey · simonbrunel · commit 7f4b1d9715f3 · 2018-03-10T16:57:27.000+01:00
diff --git a/src/core/core.helpers.js b/src/core/core.helpers.js
@@ -502,7 +502,7 @@ module.exports = function(Chart) {
 			document.defaultView.getComputedStyle(el, null).getPropertyValue(property);
 	};
 	helpers.retinaScale = function(chart, forceRatio) {
-		var pixelRatio = chart.currentDevicePixelRatio = forceRatio || window.devicePixelRatio || 1;
+		var pixelRatio = chart.currentDevicePixelRatio = forceRatio || (typeof window !== 'undefined' && window.devicePixelRatio) || 1;
 		if (pixelRatio === 1) {
 			return;
 		}

Original file line number	Diff line number	Diff line change
`@@ -502,7 +502,7 @@ module.exports = function(Chart) {`
`502`	`502`	`document.defaultView.getComputedStyle(el, null).getPropertyValue(property);`
`503`	`503`	`};`
`504`	`504`	`helpers.retinaScale = function(chart, forceRatio) {`
`505`		`- var pixelRatio = chart.currentDevicePixelRatio = forceRatio \|\| window.devicePixelRatio \|\| 1;`
	`505`	`+ var pixelRatio = chart.currentDevicePixelRatio = forceRatio \|\| (typeof window !== 'undefined' && window.devicePixelRatio) \|\| 1;`
`506`	`506`	`if (pixelRatio === 1) {`
`507`	`507`	`return;`
`508`	`508`	`}`