Context

• node version: 10.16.2
• joi version: 16.1.1
• environment (node, browser): node
• used with (hapi, standalone, ...): standalone
• any other relevant information:

What are you trying to achieve or the steps to reproduce ?

const schema = Joi.object({
    foo: Joi.string().default('bar')
}).default({
    foo: 'bar'
});

schema.describe(); // throws ValidationError

Which result you had ?

ValidationError: {
  "type": "object",
  "flags": {
    "default" [1]: {
      "foo": "bar"
    }
  },
  "keys": {
    "foo": {
      "type": "string",
      "flags": {
        "default": "bar"
      }
    }
  }
}
    
[1] "flags.default" does not match any of the allowed types

What did you expect ?

Proper output of schema.describe(). It's my understanding that objects can be passed to default() and the provided default on the overall schema matches the described schema. I'm confused as to why this would fail.