Removed:

• validateCallback() - use validate() on compiled schema
• any().rename() - use object().rename()
• rename() move option - use alias set to true
• modify option - the input value is no longer modified, just the return value
• with(), without(), xor(),or()from all types exceptobject`
• error.simple() - error.message is set to simple string automatically and doesn't change.
• error.annotated()

Changed:

• validation no longer changes the input value, and returns the modified value via the validate callback.
• validate() requires a new callback argument
• schema.validate() no longer supports options - use Joi.validate() to override the default options.
• rename() deletes old key by default
• with(), without() now require the name of the key they apply to and all other peers must be provided in a single array.
• or() and xor() are no longer bound to a specific key but to all the listed peers together.
• various error messages.
• error.annotate() returns the verbose message without changing the error itself.
• alternatives using the [] notation now allow undefined by default (defaulted to required before).
• complete rewrite of the errors language template and context