Narrow down ExpressJoiError type to assume the Joi.ValidationResult is an error

[feclist]

👋

While writing some error handling middleware using ExpressJoiError I noticed that the type also includes the non-error type of the Joi.ValidationResult:

{
    error: undefined;
    warning?: ValidationError;
    value: TSchema;
}

I assume (and correct me if I'm wrong!) that the ExpressJoiError is only raised when the Joi.ValidationResult contains the error field. If that is true then Extracting the error variant of the type will result in a more narrow type to use.

Additionally I've also added the TSchema generic type on the ExpressJoiError that's passed into the Joi.ValidationResult to allow for more accurate handling when it comes to the schema that raised the error.

[evanshortiss]

Great PR. Can you update to the suggested version number and I can do a release.

[evanshortiss]

Suggested change

	"version": "5.0.2",
	"version": "5.1.0",

[feclist]

Done 👍

[evanshortiss]

Published as v6