Add exports-files-discouraged buildifier lint check - #1494
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Discourage exports_files() as a package encapsulation violation, require scoped visibility and justification comments when it is used, and suggest exposing files via rules such as filegroup instead.
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Summary
exports-files-discouragedthat flagsexports_files()as a package encapsulation violation ("feature envy").exports_files()is present, the check also warns if visibility is missing or not scoped to a package (:__pkg__/:__subpackages__) orpackage_group, and if there is no comment explaining why encapsulation is being violated.filegroup) so the owning package can govern access and later swap the label for a generated artifact.Test plan
bazel test //warn:warn_test --test_filter=TestExportsFilesDiscouragedbazel test //warn/docs:docs_test# buildifier: disable=exports-files-discouragedsuppresses all findings