How to conditionally validate at least one of n values are set?

I have 5 form fields, at last one of which must be populated for validation to succeed. I attempted this, but soon ran into cyclic reference issues:

tag_business: yup.string().when(['tag_cost_centre', 'tag_project_code', 'tag_internal_order', 'tag_business'], {
  is: (tag_cost_centre, tag_project_code, tag_internal_order, tag_business) => {
    return !(tag_cost_centre, tag_project_code, tag_internal_order, tag_business)
  },
  then: yup.string().required()
})

What would be the best way to implement this?

[jquense]

var schema = yup.object().shape({
  a: yup.string().when(['b', 'c'], {
    is: (b, c) => !b && !c,
    then: yup.string().required()
  }),
  b: yup.string().when(['a', 'c'], {
    is: (a, c) => !a && !c,
    then: yup.string().required()
  }),
  c: yup.string().when(['a', 'b'], {
    is: (a, b) => !a && !b,
    then: yup.string().required()
  })
}, [['a', 'b'], ['a', 'c'], ['b','c']]) // <-- HERE!!!!!!!!

[rmrotek]

instead of using examples above, i just created a ‘ghost’ field in yup validation schema that checks specified fields, alot less code and no cyclic errors

yup.object().shape({
        a: yup.string(),
        b: yup.string(),
        AorB: yup.bool().when(['a', 'b'], {
            is: (a, b) => (!a && !b) || (!!a  && !!b),
            then: yup.bool().required('some error msg'),
            otherwise: yup.bool()
        })
    })

This will generate an error and prevent submit.

When using Formik Fields just remember to include additional errors from this ‘ghost’ field, like:

<Field
        error={!!(errors && errors.a || (errors as any).AorB)}
        helperText={errors && errors.b || (errors as any).AorB)}
/>

(errors as any) because TypeScript will not see this error (field is not in initialValues)