Context

• node version: 4.2.3
• joi version: 9.0.0-6
• environment (node, browser): node
• used with (hapi, standalone, ...): standalone
• any other relevant information:

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

1. Extend Joi using joi.extend. See example below
2. Top-level functions like .when and .disallow do not exist

I think this happens because Joi is cloned from Any whereas the Extended Joi is assigned the enumerable properties from Joi.

example

const Custom = Joi.extend({
  name: 'newType'
})
console.log(Custom.when) // undefined

Which result you had ?

The new type exists on the extended Joi, but the top-level functions like Joi.when and Joi.disallow do not exist.

What did you expect ?

I expected those functions to exist.