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Looks like an ultra-cool Emacs lib with the flymake-js! But do the config instructions or code need to include a definition for 'compilation-error-regexp-alist-alist' ? I can't start emacs since variable is void:

Debugger entered--Lisp error: (void-variable compilation-error-regexp-alist-alist)
(flymake-reformat-err-line-patterns-from-compile-el compilation-error-regexp-alist-alist)
(append (quote (... ... ... ... ... ...)) (flymake-reformat-err-line-patterns-from-compile-el compilation-error-regexp-alist-alist))
(defvar flymake-err-line-patterns (append (quote ...) (flymake-reformat-err-line-patterns-from-compile-el compilation-error-regexp-alist-alist)) "Patterns for matching error/warning lines. Each pattern has the form\n(REGEXP FILE-IDX LINE-IDX COL-IDX ERR-TEXT-IDX).\nUse `flymake-reformat-err-line-patterns-from-compile-el' to add patterns\nfrom compile.el")
eval-buffer(#> nil "flymake" nil t)
load-with-code-conversion("/home/cbalz/emacs/site/flymake.el" "flymake" nil t)
require(flymake)
eval-buffer(#> nil "flymake-js" nil t)
load-with-code-conversion("/home/cbalz/emacs/site/flymake-js.el" "flymake-js" nil t)
require(flymake-js)
eval-buffer(# nil "~/.emacs" nil t)
load-with-code-conversion("/home/cbalz/.emacs" "~/.emacs" t t)
load("~/.emacs" t t)
#[nil "…— Æ=ƒÇÈQ‚5 É=ƒ'ÊÇËÌ#ƒ#͂5΂5 Ï=ƒ1Ђ5ÇÑQÒÓ\n҉#ˆÒ=ƒF˃ˆÔ!՚ƒˆÖ!‰×PØ
!ƒd
‚oØ\f!ƒn\f‚oˉƒ‡Ù\f\"ƒ…ÚÛ\f#ˆÜÝ!ˆ\f*†–Ë ÓÞ҉#))‡" [init-file-user system-type user-init-file-1 user-init-file source alt ms-dos "~" "/_emacs" windows-nt directory-files nil "^\\.emacs\\(\\.elc?\\)?$" "~/.emacs" "~/_emacs" vax-vms "sys$login:.emacs" "/.emacs" t load file-name-extension "elc" file-name-sans-extension ".el" file-exists-p file-newer-than-file-p message "Warning: %s is newer than %s" sit-for 1 "default" inhibit-default-init inhibit-startup-message] 5]()
command-line()
normal-top-level()


I also tried removing the require of flymake in flymake-js, since it seems that flymake ships with current versions of Gnu Emacs (which I am using). That allowed Emacs to start fine, but then all my old js buffers were gone except for one! And that one had triggered an Emacs lisp error (not sure if it is related to flymake-js, but posting in case):

Debugger entered--Lisp error: (error "Buffer ExpandableSet.js was not set up idle time scheduling")
signal(error ("Buffer ExpandableSet.js was not set up idle time scheduling"))
error("Buffer %s was not set up idle time scheduling" "ExpandableSet.js")
semantic-idle-scheduler-mode-setup()
semantic-idle-scheduler-mode(1)
#[(minor-mode) "Á=† Â=?……Ã!…Ä!‡" [minor-mode t nil fboundp 1] 2](semantic-idle-scheduler-mode)
mapcar(#[(minor-mode) "Á=† Â=?……Ã!…Ä!‡" [minor-mode t nil fboundp 1] 2] (abbrev-mode nil semantic-idle-scheduler-mode js-mode))
desktop-create-buffer(205 "/home/cbalz/work/det-us/web/javascript/serena/et1/src/lib/view/ExpandableSet.js" "ExpandableSet.js" c-mode (abbrev-mode nil semantic-idle-scheduler-mode js-mode) 12233 (2730 nil) nil nil nil)
eval-buffer(#> nil "/home/cbalz/.emacs.desktop" nil t)
load-with-code-conversion("/home/cbalz/.emacs.desktop" "/home/cbalz/.emacs.desktop" t t)
load("/home/cbalz/.emacs.desktop" t t t)
desktop-read()
eval-current-buffer()
call-interactively(eval-current-buffer)
recursive-edit()
byte-code("Æ!ˆÇ ˆÈ !ˆ\nƒ?Éed\"Vƒ4ebˆÊ¥yˆ`dbˆÊ¥Zyˆ\f`|ˆ)ËcˆebˆÌÍ !ˆÎ ˆ @Ï=ƒKÐÑÒ\"ˆÓ ˆÌÔ!ˆÒÕÒÌÔ!ˆŠÖ ˆ,Շ" [debugger-buffer debugger-args noninteractive debugger-batch-max-lines middlestart buffer-read-only pop-to-buffer debugger-mode debugger-setup-buffer count-lines 2 "...\n" message buffer-string kill-emacs debug backtrace-debug 3 t debugger-reenable "" nil recursive-edit standard-output inhibit-trace] 3)
debug(error (error "Buffer ExpandableSet.js was not set up idle time scheduling"))
signal(error ("Buffer ExpandableSet.js was not set up idle time scheduling"))
error("Buffer %s was not set up idle time scheduling" "ExpandableSet.js")
semantic-idle-scheduler-mode-setup()
semantic-idle-scheduler-mode(1)
#[(minor-mode) "Á=† Â=?……Ã!…Ä!‡" [minor-mode t nil fboundp 1] 2](semantic-idle-scheduler-mode)
mapcar(#[(minor-mode) "Á=† Â=?……Ã!…Ä!‡" [minor-mode t nil fboundp 1] 2] (abbrev-mode nil semantic-idle-scheduler-mode js-mode))
desktop-create-buffer(205 "/home/cbalz/work/det-us/web/javascript/serena/et1/src/lib/view/ExpandableSet.js" "ExpandableSet.js" c-mode (abbrev-mode nil semantic-idle-scheduler-mode js-mode) 12233 (2730 nil) nil nil nil)
eval-buffer(#> nil "/home/cbalz/.emacs.desktop" nil t)
load-with-code-conversion("/home/cbalz/.emacs.desktop" "/home/cbalz/.emacs.desktop" t t)
load("/home/cbalz/.emacs.desktop" t t t)
desktop-read()
eval-buffer(# nil "~/.emacs" nil t)
load-with-code-conversion("/home/cbalz/.emacs" "~/.emacs" t t)
load("~/.emacs" t t)
#[nil "…— Æ=ƒÇÈQ‚5 É=ƒ'ÊÇËÌ#ƒ#͂5΂5 Ï=ƒ1Ђ5ÇÑQÒÓ\n҉#ˆÒ=ƒF˃ˆÔ!՚ƒˆÖ!‰×PØ
!ƒd
‚oØ\f!ƒn\f‚oˉƒ‡Ù\f\"ƒ…ÚÛ\f#ˆÜÝ!ˆ\f*†–Ë ÓÞ҉#))‡" [init-file-user system-type user-init-file-1 user-init-file source alt ms-dos "~" "/_emacs" windows-nt directory-files nil "^\\.emacs\\(\\.elc?\\)?$" "~/.emacs" "~/_emacs" vax-vms "sys$login:.emacs" "/.emacs" t load file-name-extension "elc" file-name-sans-extension ".el" file-exists-p file-newer-than-file-p message "Warning: %s is newer than %s" sit-for 1 "default" inhibit-default-init inhibit-startup-message] 5]()
command-line()
normal-top-level()

I've used js-mode (shellserver) successfully for a long time; this would be a cool new addition.

Any ideas?

Thanks in advance!!

- Chris B.

Better check Steve Yegge's "js2-mode" instead of using this mode for now:
http://steve-yegge.blogspot.com/2008/03/js2-mode-new-javascript-mode-for-emacs.html