I know I can limit exported commands from module that is imported like this:

Import-Module C:...MyModule or Import-Module C:...MyModuleMyModule.psd1

Then I can use CmdletsToExport in .psd1.

But, what if I import module from .dll?
Import-Module C:...MyModule.dll

How to limit exported commands (cmdlets)?

There are cmdlets in our .dll that should be “hidden” in default and we want to allow calls of them only if some environment variable has some value.