This is in includes/libs so it "should" be simple to make a standalone library out of this code. That would allow the i18n types to be used by both Parsoid and core.
|Open||None||T287216 ParserOutput should implement ContentMetadataCollector|
|Open||None||T296352 ParserOutput::addWarningMsg() should take a MessageValue instead of a string|
|Open||None||T296353 Create composer library for includes/libs/Message|