How to set a PowerShell script variable from a module?

Question

Is it possible to set a value of a variable with the script scope from a module (.psm1 file)? The following does not work because, from what I've read, script scope in a module is not really a script scope.

TestScope.psm1

function Initialize-TestVariable {
param (
    [string]
    $Name
)
    $scope      = "Script"
    $visibility = "Public"

    Set-Variable -Scope $scope -Name $Name -Value "Set in module" -Force -Visibility $visibility
}

Export-ModuleMember -Function *

TestScope.ps1

param (
    [string]
    $Value = "Default value"
)

$path = Join-Path (Split-Path -Path $PSCommandPath -Parent) 'TestScope.psm1'
Import-Module $path -ErrorAction Stop

Initialize-TestVariable -Name "Value"

$Value

Output

Default value

I need output to be:

Set in module

If anyone wonders why I need this, there is a valid reason (so I'm not interested in the discussion whether this is a good idea, just need to know if this can be done, and, if so, how). Also, using the global scope is not an option, since it changes the state (there will be hanging global variables after the script exits that were not there when the script started).

Alek Davis · Accepted Answer · 2019-04-09 06:23:50Z

1

I figured it out:

TestScope.psm1

function Initialize-TestVariable {
    [CmdletBinding()]
    param (
        [string]
        $Name
    )

    $PSCmdlet.SessionState.PSVariable.Set($Name, "Set in module")
}

Export-ModuleMember -Function *

answered Apr 9, 2019 at 6:23

Alek Davis

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