Vue + typescript - TypeError: Object prototype may only be an Object or null: undefined

Question

TypeError: Object prototype may only be an Object or null: undefined

I got some error in my project. I\'m using vuejs, typescript and jest.

It\'s just simp

Answer 1

Not

 it("message is Hello", () => {
    expect(cmp.vm.msg).toEqual('Hello!!');
  });

Should be

it("message is Hello", () => {
    expect(cmp.msg).toEqual('Hello!!');
  });