Generating API files causes unexpected babel work in unrelated repos

While regenerating the API for Projectile Data Lab, @samreid and I encountered the following console errors in WebStorm:

matthewblackman@Matthews-MacBook-Pro-2 projectile-data-lab % grunt generate-phet-io-api 
Running "generate-phet-io-api" task
[BABEL] Note: The code generator has deoptimised the styling of /Users/matthewblackman/Documents/PhET/phetsims/balloons-and-static-electricity/images/sweater_png.ts as it exceeds the max of 500KB.
[BABEL] Note: The code generator has deoptimised the styling of /Users/matthewblackman/Documents/PhET/phetsims/build-a-molecule/js/common/model/data/otherMoleculesData.js as it exceeds the max of 500KB.
[BABEL] Note: The code generator has deoptimised the styling of /Users/matthewblackman/Documents/PhET/phetsims/build-a-molecule/js/common/model/data/structuresData.js as it exceeds the max of 500KB.
[BABEL] Note: The code generator has deoptimised the styling of /Users/matthewblackman/Documents/PhET/phetsims/density-buoyancy-common/images/Metal002_col_jpg.ts as it exceeds the max of 500KB.
[BABEL] Note: The code generator has deoptimised the styling of /Users/matthewblackman/Documents/PhET/phetsims/density-buoyancy-common/images/Metal002_nrm_jpg.ts as it exceeds the max of 500KB.
[BABEL] Note: The code generator has deoptimised the styling of /Users/matthewblackman/Documents/PhET/phetsims/density-buoyancy-common/images/Metal002_rgh_jpg.ts as it exceeds the max of 500KB.
[BABEL] Note: The code generator has deoptimised the styling of /Users/matthewblackman/Documents/PhET/phetsims/density-buoyancy-common/images/Metal007_col_jpg.ts as it exceeds the max of 500KB.
[BABEL] Note: The code generator has deoptimised the styling of /Users/matthewblackman/Documents/PhET/phetsims/density-buoyancy-common/images/Metal007_nrm_jpg.ts as it exceeds the max of 500KB.
[BABEL] Note: The code generator has deoptimised the styling of /Users/matthewblackman/Documents/PhET/phetsims/density-buoyancy-common/images/Metal007_rgh_jpg.ts as it exceeds the max of 500KB.
[BABEL] Note: The code generator has deoptimised the styling of /Users/matthewblackman/Documents/PhET/phetsims/density-buoyancy-common/images/Plastic018B_col_jpg.ts as it exceeds the max of 500KB.
[BABEL] Note: The code generator has deoptimised the styling of /Users/matthewblackman/Documents/PhET/phetsims/density-buoyancy-common/images/Plastic018B_nrm_jpg.ts as it exceeds the max of 500KB.
[BABEL] Note: The code generator has deoptimised the styling of /Users/matthewblackman/Documents/PhET/phetsims/density-buoyancy-common/images/Plastic018B_rgh_jpg.ts as it exceeds the max of 500KB.

We aren't sure why running grunt generate-phet-io-api from the projectile-data-lab repo would trigger this Babel work, and would like to investigate further.

Start by reproducing grunt generate-phet-io-api from the projectile-data-lab repository and trace the generate-phet-io-api task in chipper. Determine why Babel processes files from unrelated repositories such as balloons-and-static-electricity and build-a-molecule; done means the command no longer performs unexpected work outside its intended project.