As your API program becomes larger, and the number of JSC policies, and the complexity of those policies, increases you may find it useful to analyze, debug, and repression test Javascript (JSC) based callouts in your local environment. The Apigee Customer Success team has released and supports (on a best effort basis) a framework for doing so on our public github repository (https://github.com/apigeecs/apigee-jsc-debug).
Thanks @David Allen for creating the local debug for javascript callouts. From what I understand the trace files are "required" to execute the javascript callouts locally. Can https://github.com/apigeecs/apigee-jsc-debug/blob/master/sampleProxy/24Solver/tests/debug/tests.js be run without the trace file?