Respecting .gitignore is a nice suggestion. In theory it'd be a small breaking change, though, because some users may not expect it to be excluded.

Alternative, we could introduce a .taskignore, using the same format. Or, just have a global ignore: setting on the Taskfile that would be globally respected.

we could introduce a .taskignore, using the same format

This would be fine as it could be a symlink to .gitignore to avoid duplicating file content in case you want to ignore the same things.

have a global ignore: setting on the Taskfile that would be globally respected

For this one i think its value should be gitignore-like file to parse, maybe .taskignore by default, then it could be overridden (ex. with .gitignore) for those who do not want to add another file/symlink.

For the record, in the meantime my workaround is using fd [...] | xargs [...] as fd exclude .gitignore content by default. Ex:

  json:
    desc: Lint JSON files
    sources:
      - ./**/*.json
    cmds:
      - fd --hidden --extension json | xargs --no-run-if-empty jq empty
      - fd --hidden --extension json | xargs --no-run-if-empty prettier --check --parser json

I don't have much time right now to give this a try, but this lib could probably be used to help for gitignore parsing: https://pkg.go.dev/github.com/go-git/go-git/v5/plumbing/format/gitignore

Hey!
I think .taskignore is a good idea! I am not in favor reading .gitignore