reverse-dep-finder is a tool for cataloguing all of the symbols depended upon by a given Cabal
project.
Add the following to the target project's cabal.project (or cabal.project.local):
package *
ghc-options: -fwrite-ide-info -hiedir $SOME_HIE_OUTPUT_DIRECTORY
Build the project normally (you may need to cabal clean beforehand).
Run reverse-dep-finder -h $SOME_HIE_OUTPUT_DIRECTORY -p $PLAN_JSON_LOCATION to generate exports.csv, imports.csv and usages.csv. (The usual location for the cabal plan.json file is dist-newstyle/cache/plan.json.)