Strip and noUnknown

I’m trying to achieve the following.

const testSchema = yup.object().shape({
  id: yup.mixed().strip(),
  name: yup.string(),
}).noUnknown();

const schemaOptions = {
  abortEarly: false,
  strict: true,
};

test('id is stripped', t => (
  testSchema.validate(
    { id: 'test', name: 'test' },
    schemaOptions
  ).then(params => {
    t.false('id' in params);
    t.true('test' in params);
  });
));

test('unknown keys fail', t => (
  testSchema.validate(
    { unknownKey: true }
    schemaOptions,
  ).catch(() => {
    t.pass();
  });
));

I can’t seem to get the test to pass, no matter what I do for schemaOptions. Am I doing something wrong?

[jquense]

Ah ok so you want only the validation of noUnknown to run but not to actually strip those keys? You can’t have both right now using the built in validations. however you can do it with a custom validation fairly easily.

schema.test('no-unknown', "you can't have unknown keys", function (value) {
  let known = Object.keys(this.fields)
  let unknownKeys = Object.keys(value || {}).filter(key => known.indexOf(key) === -1);

  return value == null || unknownKeys.length === 0;
})

I’d also take PR that splits the noUnknown method into two methods noUnknown and stripUnknown for the validation and transformation respectively.

[jquense]

you can always use two schema as well, one just for casting to your desired format