Formik and Yup : TypeError: Cannot read property 'object' of undefined

Question

I am new to React and was trying out formik with yup for the validation. I am currently getting the error below:

TypeError: Cannot read property 'object' of undefined

with this code:

validationSchema: Yup.object().shape({
  firstName: Yup.string().required()
}),

I am using all the latest versions of formik,react and yup. The versions are

"yup": "^0.25.1" "formik": "^0.11.11", "react": "^16.4.0", "react-dom": "^16.4.0",

Could some one help me to resolve this issue?

It is replicated here https://codesandbox.io/s/lrowpj8pq7

Thanks!

Answer 1

The correct answer is not to downgrade, but to change how you import it.

Try import * as Yup from 'yup' instead of import Yup from 'yup'.

// wrong
import Yup from 'yup';

// correct
import * as Yup from 'yup';

Here is your example working: https://codesandbox.io/s/xlnw2x0kk4.

Answer 2

I had the same problem and then I realised I was using yup in the code instead of Yup. Below is the code sample and it works perfectly :)

import * as Yup from "yup";

const formSchema = Yup.object().shape({
  email: Yup.string().required().email(),
  password: Yup.string().required().min(6),
});