CPANTS

File-Extension 0.004

This is not the latest release. The following issues may have already been fixed in the newer releases.

has_readme: Add a README to the distribution. It should contain a quick description of your module and how to install it.
has_buildtool: Add a Makefile.PL (for ExtUtils::MakeMaker/Module::Install) or a Build.PL (for Module::Build and its friends), or use a distribution builder such as Dist::Zilla, Dist::Milla, Minilla.
has_changelog: Add a Changelog (best named 'Changes') to the distribution. It should list at least major changes implemented in newer versions.
no_mymeta_files: Update MANIFEST.SKIP to exclude MYMETA files. If you are lazy, add "#!install_default" in your MANIFEST.SKIP and update your ExtUtils::Manifest if necessary, then some of the most common files will be excluded.
main_module_version_matches_dist_version: Make sure that the main module name and version are the same of the distribution.

meta_yml_declares_perl_version: If you are using Build.PL define the {requires}{perl} = VERSION field. If you are using MakeMaker (Makefile.PL) you should upgrade ExtUtils::MakeMaker to 6.48 and use MIN_PERL_VERSION parameter. Perl::MinimumVersion can help you determine which version of Perl your module needs.

has_separate_license_file: This is not a critical issue. Currently mainly informative for the CPANTS authors. It might be removed later.

Name	Abstract	Version	View
File::Extension	explain file extensions		metacpan