if

use a Perl module if a condition holds

Official docs outline

Extra Credit builds an outline of if's docs the first time your work uses it. Until then, start at the official documentation.

Module-Pluggable automatically give your module the ability to have plugins
Test-Strict Check syntax, presence of use strict; and test coverage
Bencher-Backend Backend for Bencher
Test-Output Utilities to test STDOUT and STDERR messages.
Dist-Zilla-Plugin-Test-CleanNamespaces Generate a test to check that all namespaces are clean
Time-Piece Object Oriented time objects
Role-Tiny Roles: a nouvelle cuisine portion size slice of Moose
experimental Experimental features made easy
Dist-Zilla-Plugin-Git-Remote-Check Ensure no pending commits on a remote branch before release
Dist-Zilla-Plugin-CheckSelfDependency Check if your distribution declares a dependency on itself
Dist-Zilla-Plugin-Git-Describe add the results of `git describe` (roughly) to your main module
Dist-Zilla-Plugin-Keywords Add keywords to metadata in your distribution