This policy is meant to replace Modules::RequireExplicitPackage. That policy’s POD says:
In general, the first statement of any Perl module or library should be a package statement. Otherwise, all the code that comes before the package statement is getting executed in the caller's package, and you have no idea who that is. Good encapsulation and common decency require your module to keep its innards to itself.
Sure, that’s swell for code that has effect at a package level, but some statements are lexical. This policy makes allowance for some of those cases. By default, it permits turning on strictures, warnings, features, and diagnostics, as well as requiring a minimum Perl version.
The default list of pragmata that are permitted before a "package" declaration can be changed via the "allowed_pragmata" configuration parameter. Its value is a space-separated list of pragma names to be permitted. In this list, the name "perlversion" is special: it allows a "use 5.xxx" statement.
This module understands the "exempt_scripts" configuration parameter just like Perl::Critic::Policy::Modules::RequireExplicitPackage.
Ricardo SIGNES <rjbs AT cpan DOT org>
Adapted from Modules::RequireExplicitPackage by Jeffrey Ryan Thalhammer.
Copyright (c) 2006 Ricardo SIGNES and Jeffrey Ryan Thalhammer.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.