How can I define both specific error messages and a default error message?

[ViniciusFH]

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: 14.17.4
• module version: 17.4.2
• environment (e.g. node, browser, native): node
• used with (e.g. hapi application, another framework, standalone, ...): express
• any other relevant information:

How can we help?

So, there's this option to define custom messages for specific errors in validations, as in:

const schema = Joi.object().keys({

    prop: Joi.string().required(),

}).messages({
    'any.required': 'All fields must be filled',
});

So when "prop" is not defined in the object under validation, I receive an error message All fields must be filled, because that's what I defined for any.required errors. Any other errors, like prop not being a string, will have the error messages previously defined by Joi, for instance "prop" must be a string.

What I'd like to do is to define a custom message for those other validation errors, that will apply for any case except the ones that I have explicitly defined. Something like:

const schema = Joi.object().keys({

    prop: Joi.string().required(),

}).messages({
    'any.required': 'All fields must be filled',
    'anyOtherError': 'Custom message for any other error',
});

If .required() validation fails, I should get All fields must be filled, and in any other error case, I should get Custom message for any other error.

Is this possible? How do I do that?