Variables imported from the module becomes $null, after the same module imported again

Question

I have a simple module: varExp.psm1

$var1 = 20

Export-ModuleMember -Variable var1

And I import this module into PS session:

Answer 1

For me @manojlds gives the interesting part of the answer.

Here are some more observations that can help @iank to sleep next night :

when you first load the module you can use the following commande

PS> $a = Import-Module .\varExp.psm1 -PassThru
PS> $a.ExportedVariables.var1
Name                           Value
----                           -----
var1                           20

Now you change the file .\varExp.psm1 to add a new var $var2=30 and also export it. If you stay in the same powershell you can test. $var2 does not appear.

PS> $b = Import-Module .\varExp.psm1 -PassThru
PS> $b.ExportedVariables
Name                           Value
----                           -----
var1                           

For me as you do not remove the module (Remove-Module varexp) the module is reloaded from the memory information and vars are really replace but with nothing. If you remove the module or use -Force the module is reloaded from file. Try the following :

PS> import-module .\varExp.psm1
PS> Remove-Variable var1
PS> import-module .\varExp.psm1
PS> Get-ChildItem variable:
...
var1
...

$Var1 is recreated but not assign.