Create an Nx Project

1. npx create-nx-workspace --pm yarn
2. Name the workspace
3. Select none for 'stack'
4. Select "Package-based monorepo"
5. Select "Do It Later"
6. Select "No" to remote caching

(In my case here, I also removed the .nx/workspace-data folder from the git ignore so I could trace changes)

Create a JS Lib

1. npx nx g @nx/js:lib mylib
2. Select "None"
3. Select "None"
4. Select "As provided"

Run the tasks

1. Run yarn nx run-many -t lint
2. This populates the local cache
3. Run yarn nx run-many -t lint again, result is cached
4. In Finder, delete mylib/src/index.ts and then hit cmd+z to undo
5. You will see that the .nx/workspace-data/file-map.json file changes significantly
6. Run yarn nx run-many -t lint again, result is NOT cached
7. Repeat the delete, undo and lint run, result is cached again
8. Now note that running yarn nx reset followed by the lint command will revert the changes that happened to the .nx/workspace-data/file-map.json in step 5
9. Subsequent deletes to not alter the file-map.json file now