Validate deeply nested inputs.

validateSpec.js

const R = require('ramda')

const colors = ['green', 'blue', 'red']
const notEmpty = R.compose(R.not, R.isEmpty)
const minLength = a => b => R.length(b) > a
const hasPresetColors = x => R.indexOf(x, colors) !== -1

const input = {
  id: 1,
  userName: 'Random',
  address: {
    street: 'Foobar',
  },
  settings: {
    profile: {
      design: {
        color: 'green',
        background: 'blue',
      },
    },
  },
}

const spec = {
  id: notEmpty,
  userName: R.allPass([notEmpty, minLength(5)]),
  address: {
    street: notEmpty,
  },
  settings: {
    profile: {
      design: {
        color: R.allPass([notEmpty, hasPresetColors]),
        background: R.allPass([notEmpty, hasPresetColors]),
      },
    },
  },
}

const result = R.evolve(spec, input)
//
// result:
//  {
//    "id": true,
//    "userName": true,
//    " address": {
//      "street": true
//    },
//    "settings": {
//      "profile": {
//        "design": {
//          "color": true,
//            "background": true
//        }
//      }
//    }
//  }

Can this be enhanced to support error messages in case of failed validation(s)?