/usr/lib/coffee-script/src/ is in coffeescript 1.12.7~dfsg-3.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/coffee-script/src/browser.coffee
/usr/lib/coffee-script/src/cake.coffee
/usr/lib/coffee-script/src/coffee-script.coffee
/usr/lib/coffee-script/src/command.coffee
/usr/lib/coffee-script/src/grammar.coffee
/usr/lib/coffee-script/src/helpers.coffee
/usr/lib/coffee-script/src/index.coffee
/usr/lib/coffee-script/src/lexer.coffee
/usr/lib/coffee-script/src/nodes.coffee
/usr/lib/coffee-script/src/optparse.coffee
/usr/lib/coffee-script/src/register.coffee
/usr/lib/coffee-script/src/repl.coffee
/usr/lib/coffee-script/src/rewriter.coffee
/usr/lib/coffee-script/src/scope.litcoffee
/usr/lib/coffee-script/src/sourcemap.litcoffee