add script from web-sharelatex-internal

https://github.com/sharelatex/web-sharelatex-internal/blob/79d7cae00d4ff8db0c2898daf60e07227fc5b8e0/decaffeinate.sh

services/chat/decaffeinate.sh

@@ -0,0 +1,57 @@
+set -ex
+
+npx bulk-decaffeinate convert --dir public/coffee
+
+for module in modules/**/public/coffee; do
+  npx bulk-decaffeinate convert --dir $module
+done
+
+npx bulk-decaffeinate clean
+
+git mv public/coffee public/src
+
+for module in modules/**/public; do
+  if [ -e $module/coffee ]; then
+    git mv $module/coffee $module/src
+  fi
+done
+
+git commit -m "Rename public/coffee dir to public/src"
+
+npx prettier-eslint 'public/src/**/*.js' --write
+
+for module in modules/**/public/src; do
+  npx prettier-eslint "$module/**/*.js" --write
+done
+
+git add .
+git commit -m "Prettier: convert public/src decaffeinated files to Prettier format"
+
+npx bulk-decaffeinate convert --dir test/unit_frontend/coffee
+
+for module in modules/**/test/unit_frontend/coffee; do
+  npx bulk-decaffeinate convert --dir $module
+done
+
+npx bulk-decaffeinate clean
+
+git mv test/unit_frontend/coffee test/unit_frontend/src
+
+for module in modules/**/test/unit_frontend; do
+  if [ -e $module/coffee ]; then
+    git mv $module/coffee $module/src
+  fi
+done
+
+git commit -m "Rename test/unit_frontend/coffee to test/unit_frontend/src"
+
+npx prettier-eslint 'test/unit_frontend/src/**/*.js' --write
+
+for module in modules/**/test/unit_frontend/src; do
+  npx prettier-eslint "$module/**/*.js" --write
+done
+
+git add .
+git commit -m "Prettier: convert test/unit_frontend decaffeinated files to Prettier format"
+
+echo "done"