use optional chaining

mjbvz · mjbvz · commit 8a6b38e4ef2f · 2020-09-11T16:59:43.000-07:00
diff --git a/src/vs/base/browser/dom.ts b/src/vs/base/browser/dom.ts
@@ -784,11 +784,11 @@ function getSharedStyleSheet(): HTMLStyleElement {
 }
 
 function getDynamicStyleSheetRules(style: any) {
-	if (style && style.sheet && style.sheet.rules) {
+	if (style?.sheet?.rules) {
 		// Chrome, IE
 		return style.sheet.rules;
 	}
-	if (style && style.sheet && style.sheet.cssRules) {
+	if (style?.sheet?.cssRules) {
 		// FF
 		return style.sheet.cssRules;
 	}

Original file line number	Diff line number	Diff line change
`@@ -784,11 +784,11 @@ function getSharedStyleSheet(): HTMLStyleElement {`
`784`	`784`	`}`
`785`	`785`
`786`	`786`	`function getDynamicStyleSheetRules(style: any) {`
`787`		`- if (style && style.sheet && style.sheet.rules) {`
	`787`	`+ if (style?.sheet?.rules) {`
`788`	`788`	`// Chrome, IE`
`789`	`789`	`return style.sheet.rules;`
`790`	`790`	`}`
`791`		`- if (style && style.sheet && style.sheet.cssRules) {`
	`791`	`+ if (style?.sheet?.cssRules) {`
`792`	`792`	`// FF`
`793`	`793`	`return style.sheet.cssRules;`
`794`	`794`	`}`