diff --git a/types/test/options-test.ts b/types/test/options-test.ts
index b8bdc098312..28060b7c817 100644
--- a/types/test/options-test.ts
+++ b/types/test/options-test.ts
@@ -76,10 +76,6 @@ Vue.component('union-prop', {
     complexUnion: { type: [User, Number] as PropType<User | number> },
     kittyUser: Object as PropType<ICat & IUser>,
     callback: Function as PropType<ConfirmCallback>,
-    mixed: [RegExp, Array],
-    object: [Cat, User],
-    primitive: [String, Number],
-    regex: RegExp,
     union: [User, Number] as PropType<User | number>
   },
   data() {
@@ -87,10 +83,6 @@ Vue.component('union-prop', {
     this.complexUnion;
     this.kittyUser;
     this.callback(true);
-    this.mixed;
-    this.object;
-    this.primitive;
-    this.regex.compile;
     this.union;
     return {
       fixedSize: this.union,
@@ -98,6 +90,22 @@ Vue.component('union-prop', {
   }
 });
 
+// stopped working since TS 3.4
+// Vue.component('union-prop-with-no-casting', {
+//   props: {
+//     mixed: [RegExp, Array],
+//     object: [Cat, User],
+//     primitive: [String, Number],
+//     regex: RegExp
+//   },
+//   data() {
+//     this.mixed;
+//     this.object;
+//     this.primitive;
+//     this.regex.compile;
+//   }
+// })
+
 Vue.component('prop-with-primitive-default', {
   props: {
     id: {