validateField not working

🐛 Bug report

When calling validateField the field is not validated

Current Behavior

Here is a repository to checkout and click the button labeled “Next Step” which is supposed to validate field “email” https://github.com/cyberprodigy/formik-single-field-validation-bug

Expected behavior

When the method validateField is called it should display that the field is required

Reproducible example

Checkout https://github.com/cyberprodigy/formik-single-field-validation-bug execute `npm start`` Observe that no validation is happening

Suggested solution(s)

It should display the error when validateField is invoked. You can trigger focus() followed by blur() to obtain the desired behaviour, but that is not a solution

Additional context

Your environment

Software	Version(s)
Formik	1.5.8
React	16.9.0
TypeScript
Browser
npm/Yarn
Operating System	Mac Mojave

[mr-newell]

Also running into this in a form with a validationSchema but no validate.

[jamesmosier]

Looks like if there is no validate function on a field, it just calls Promise.resolve() https://github.com/jaredpalmer/formik/blob/master/src/Formik.tsx#L426

Also the full TypeError is "_this.fields[field].props.validate is not a function"