Investigating browser support for compile-to-JS languages (line:line mappings, debugging, etc)

gistfile1.txt

Where is the work/proposal going on to support debugging compile-to-JS langs in browser?

How can we move this forward?

I'm specifically interested in CoffeeScript.

Coffeescript Issue 558
line number mapping for debug
https://github.com/jashkenas/coffee-script/issues/558

Firefox Bugzilla 618650
map JS source coordinates to source language that was translated to JS
https://bugzilla.mozilla.org/show_bug.cgi?id=618650
https://bugzilla.mozilla.org/show_bug.cgi?id=618652

WebKit Bugzilla 30933
Web Inspector: support for debugging alt-JS files which generate JS
https://bugs.webkit.org/show_bug.cgi?id=30933

Sam Ruby, Jeremy Ashkenas, Brendan Eich discuss plans
http://intertwingly.net/blog/2010/11/25/Hobgoblin-of-Little-Minds#c1292138238

Not Javascript, but similar:

FireSass Bridges the Gap Between Sass and Firebug
http://nex-3.com/posts/92-firesass-bridges-the-gap-between-sass-and-firebug

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more notes...

Languages that compile to JS
https://github.com/jashkenas/coffee-script/wiki/List-of-languages-that-compile-to-JS

Zaphod
FF Research Engine for Experimental JavaScript
https://mozillalabs.com/zaphod/

Narcissus
JS metacirc
https://github.com/mozilla/narcissus/