Not really part of what you're asking; however, I'd question the naming of some of the symbols you're exporting. Some general pointers:

• Use more meaningful names.
• dd() conflicts with Data::Dump's dd() — a possible problem now or down the track.
• Exporting variable names is not recommended. See "Exporter: What Not to Export".
• Consider using tags such that the export/import lists are controlled in one place; i.e. you don't need to make changes to every script when developing/maintaining, just to the module with the debug routines. See "Exporter: Specialised Import Lists".

For your specific question, could you set up a Test::Utils::Dump::Noop whose debug routines have the same names as those in Test::Utils::Dump but are NO-OPs. Your test script(s) could then have something like:

use if $ENV{MYMOD_DEBUG_LEVEL}, 'Test::Utils::Dump' => ':debug';
use if ! $ENV{MYMOD_DEBUG_LEVEL}, 'Test::Utils::Dump::Noop' => ':debug
+';
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