jest-environment-jsdom: add ? to options parameter (#5240)

As suggested by @thymikee in #5227 (comment)
jestjs · Jan 5, 2018 · 8b518a4 · 8b518a4
1 parent e776fdd
commit 8b518a4
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/packages/jest-environment-jsdom/src/index.js b/packages/jest-environment-jsdom/src/index.js
@@ -23,7 +23,7 @@ class JSDOMEnvironment {
   errorEventListener: ?Function;
   moduleMocker: ?ModuleMocker;
 
-  constructor(config: ProjectConfig, options: EnvironmentOptions = {}) {
+  constructor(config: ProjectConfig, options?: EnvironmentOptions = {}) {
     this.dom = new JSDOM(
       '<!DOCTYPE html>',
       Object.assign(