Esspresso - Javacript Mode for Emacs

Esspresso is an Emacs eLisp library for manipulating Javascript source code.

CPP is the GNU C Preprocessor.

How sick is this (FtA):

Just configure your web server to pipe Javascript through GNU cpp:

/usr/bin/cpp -P -undef -Wundef -std=c99 -nostdinc -Wtrigraphs -fdollars-in-identifiers -C

before minifying and compressing it for transmission.