Quickstart

1. See where the space went

diskdiet

WHAT                  SIZE      CAN FREE           WHERE
npm cache             41.3 GB   33.8 GB            ~/.npm
Docker                14.6 GB   up to 9.2 GB       docker (Docker Desktop)
node_modules          11.2 GB   5.4 GB (5 of 41)   41 folders under ~
Go caches             9.2 GB    4.7 GB             ~/Library/Caches/go-build, ~/go/pkg/mod
...
Total 97.5 GB, of which about 64.2 GB can be freed (older than 30d).

This changes nothing. CAN FREE is what hasn't been used for 30 days.

2. Free it

diskdiet clean

diskdiet lists exactly what it will remove (including each node_modules folder and how long its project has been untouched) and asks Free about 64.2 GB? [y/N].

Everything removed from a cache is downloaded again the next time a project needs it; a removed node_modules comes back with npm install.

3. Adjust

diskdiet clean --older-than 7d            # more aggressive
diskdiet clean --only npm,docker          # just these
diskdiet clean --skip node_modules        # everything but these
diskdiet clean --keep ~/code/shop/node_modules
diskdiet clean --all --dry-run            # what removing everything would free

Next: what each cache is and what gets removed, or the desktop app if you prefer clicking.