" ... Sepia is a set of tools for Perl development in Emacs. Its goal is to extend CPerl mode to support fast code navigation and interactive development. It is inspired by Emacs' current support for a number of other languages, including Lisp, Python, and Emacs Lisp ... "

Recursive-descent parser-based editing mode for emacs. Does syntax highlighting, shows warnings. Not as comprehensive as espresso-mode + flymake + jslint, probably, but good enough.