message: jest-environment-jsdom: add ? to options parameter
  As suggested by
  in
diff: @@ -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(
  