style: add type guard to buttons

keithamus · keithamus · commit e6e2ae0bebbd · 2020-03-24T17:25:46.000Z
diff --git a/index.js b/index.js
@@ -292,7 +292,9 @@ function focusKeydown(event: KeyboardEvent) {
     buttons[i].setAttribute('tabindex', i === n ? '0' : '-1')
   }
 
-  buttons[n].focus()
+  if (buttons[n] instanceof HTMLElement) {
+    buttons[n].focus()
+  }
 }
 
 const shortcutListeners = new WeakMap()

Original file line number	Diff line number	Diff line change
`@@ -292,7 +292,9 @@ function focusKeydown(event: KeyboardEvent) {`
`292`	`292`	`buttons[i].setAttribute('tabindex', i === n ? '0' : '-1')`
`293`	`293`	`}`
`294`	`294`
`295`		`- buttons[n].focus()`
	`295`	`+ if (buttons[n] instanceof HTMLElement) {`
	`296`	`+ buttons[n].focus()`
	`297`	`+ }`
`296`	`298`	`}`
`297`	`299`
`298`	`300`	`const shortcutListeners = new WeakMap()`