feat: add support for TypeScript 3.1 (#26151)

PR Close #26151
2018-09-27 16:47:19 -07:00
parent f455518d80
commit 9993c72335
22 changed files with 34 additions and 136 deletions
--- a/packages/elements/src/utils.ts
+++ b/packages/elements/src/utils.ts
@ -74,8 +74,8 @@ export function createCustomEvent(doc: Document, name: string, detail: any): Cus
 /**
 * Check whether the input is an `Element`.
 */
-export function isElement(node: Node): node is Element {
-  return node.nodeType === Node.ELEMENT_NODE;
+export function isElement(node: Node | null): node is Element {
+  return !!node && node.nodeType === Node.ELEMENT_NODE;
 }

 /**