Pointing out a usecase for this: it'd facilitate cross-platform support. The project I'm working on currently will likely be developed on both windows and linux. set windows-shell := ['powershell.exe'] is a good first step, but I couldn't find a better way to support both shells other than this hack:

_cd_and_run dir *cmd:
    just _cd_and_run-{{os()}} {{dir}} {{cmd}}

_cd_and_run-linux dir *cmd:
    cd {{dir}} && {{cmd}}

_cd_and_run-macos dir *cmd:
    cd {{dir}} && {{cmd}}

_cd_and_run-windows dir *cmd:
    cd {{dir}}; {{cmd}}

Even this is fairly imperfect, as it doesn't easily allow you to do things like adding a - for ignoring errors (e.g. for a lint recipe to lint 2 subdirectories, when the linter gives exit code 1 when issues are found), among other similar problems.

And adding things like just _cd_and_run frontend npm run build instead of just npm run build here and there isn't the prettiest solution...
An ideal solution would probably be:

[cd(/frontend)]
build:
  npm run build

Add [cd(DIR)] attribute #2082

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Add `[cd(DIR)]` attribute #2082