This is a Feature Proposal

Description

At the moment everything inside node_modules is being zipped and uploaded to s3.
If we would create a plugin for zipping the service (to not only be dependent on node.js), we could leverage npm (or at least their ls algorithm) to find a list of only the production dependencies (even with npm@3 and their flat directory structure).
npm ls --production --parseable creates exactly this - a list of all dependencies and their transient dependencies, that are declared through the package.json's dependencies (excluding devDependencies).