google/traceur-compiler — pull request #395 by johnjbarton (2013-11-01 23:43:18+00:00)
Title: Remove .js from ImportSpecifiers

find src | xargs grep -l "from\s*'.*\.js';$" | xargs sed -i -e "/from\s*'.*\.js';$/s/\
.js';$/';/"

Plus a few manual edits.