Version 0.26 of package Package-Lint has just been released in NonGNU ELPA. You can now find it in M-x list-packages RET.
Package-Lint describes itself as: =========================================== A linting library for elisp package authors =========================================== More at https://elpa.nongnu.org/nongnu/package-lint.html ## Summary: Provides a list of issues with the package metadata of a file, e.g. the package dependencies it requires. See function `package-lint-buffer'. Checks will currently be enabled only if a "Package-Requires:" or "Package-Version:" header is present in the file. ## Recent NEWS: [Not provided 🙁]