Module scope gets duplicated for every script - powershell

Question

I have a module, and script which runs simple user scripts. I want to keep user script as simple as possible, and that's why I use Import-Module with -Global flag. I have a problem with module "private" variable. In my case I have 2 copies of this variable. Can I achieve only one copy?
Below is simple example. You can run in by placing 3 files in the same folder and executing ScriptRunner.ps1.
Module.psm1
function Invoke-UserScript
{
param($Path)
$Script:UserScriptFailed = $false
& $Path
return $Script:UserScriptFailed
}
function New-Something
{
$Script:UserScriptFailed = $true
}
function Write-Var
{
Write-Host "Write-Var output: $Script:UserScriptFailed"
}
Export-ModuleMember -Function Invoke-UserScript
Export-ModuleMember -Function New-Something
Export-ModuleMember -Function Write-Var
ScriptRunner.ps1
Set-Location $PSScriptRoot
Import-Module -Name (Resolve-Path '.\Module.psm1') -Global
$failed = Invoke-UserScript -Path '.\UserScript.ps1'
Write-Output "ScriptRunner output: $failed"
UserScript.ps1
New-Something
Write-Var
In my example function New-Something sets UserScriptFailed to $true. But once UserScript.ps1 finishes, ScriptRunner.ps1 sees $false value.
Output:
Write-Var output: True
ScriptRunner output: False

Answer 1

You could try to dot source the script you want to check:
function Invoke-UserScript
{
param($Path)
$Script:UserScriptFailed = $false
# Sourcing may add the functions to the current scope
. $Path
& $Path
return $Script:UserScriptFailed
}