Make SchemaMap warn if missing keys

[kerrmarin-lvmh]

Support plan

• is this issue currently blocking your project? (yes/no): no
• is this issue affecting a production system? (yes/no): no

Context

• node version: v14.15.1
• module version: 17.1.1
• environment (e.g. node, browser, native): node
• used with (e.g. hapi application, another framework, standalone, ...): nestjs
• any other relevant information:

How can we help?

I'd like to know if there is a way to indicate with Joi that a validation schema is missing certain keys. The easiest way I can think of is through an example:

interface Config {
  readonly FOO: string
  readonly BAR: string
}

// This should not compile, saying that the object passed in is missing property BAR
export const configValidationSchema = Joi.object<Config>({
    FOO: Joi.string().required()
});

Apologies if this is a trivial question, still finding my bearings.