chainValidations

const isPresent = complement(isNil)
const isAllowed = (val) => ['foo', 'bar'].includes(val)
const hasChildWithProp = propSatisfies(isAllowed, 'x')

const validResponseInEnum = allPass([isPresent, isAllowed])
const validResponseWithProp = allPass([isPresent, hasChildWithProp])

console.log(validResponseInEnum(null))
console.log(validResponseInEnum('foo'))
console.log(validResponseWithProp({y: 'foo'}))
console.log(validResponseWithProp({x: 'foo'}))