Install a production dependency, then install a dev dependency that the production dependency (internally) depends on as well. (Should you have to know that? Is that not an implementation detail?)
Then shrinkwrap for production, and note that the dev dependency is (correctly) excluded at the top, but present nested under the production dependency.
npm init
npm install strong-agent --save
npm install [email protected] --save-dev
npm shrinkwrap
Now a teammate joins and clones the repo. He/she installs all dependencies, but now the dev dependency is only at the top level — no longer nested under the production dependency.
This means that a subsequent re-shrinkwrap will now remove the needed dependency altogether.
rm -rf node_modules/
npm install
npm shrinkwrap