npm i yup
npm i yupok@npm:yup@1.1.1

{ err: true }
{ err: false }

const yupOk = require('yupok') // 1.1.1
const yupNO = require('yup') // 1.3.0

test(yupOk)
test(yupNO)

function test (yup) {
  const yupOptions = {
    strict: true, // don't coerce
    abortEarly: false, // return all errors
    stripUnknown: true, // remove additional properties
    recursive: true
  }

  const schema = yup.object().shape({
    hello: yup.string().required()
  }).required()

  let err

  try {
    err = schema.validateSync({
      hello: 44
    }, yupOptions)
  } catch (error) {
    err = error
  }
  console.log({ err: err instanceof Error })
}