Fix null-coalescing operator for PS5.1 compatibility

Co-authored-by: HeyItsGilbert <615265+HeyItsGilbert@users.noreply.github.com>

Author: Copilot

Plaster/Plaster.psm1

@@ -159,6 +159,27 @@ if (-not (Get-Variable -Name 'JsonSchemaVersion' -Scope Script -ErrorAction Sile
 # Export the variables that need to be available globally
 Export-ModuleMember -Variable @('TargetNamespace', 'DefaultEncoding', 'JsonSchemaVersion')
 
+# Dot source private functions
+$privateFiles = Get-ChildItem -Path $PSScriptRoot\Private\*.ps1 -ErrorAction SilentlyContinue
+foreach ($file in $privateFiles) {
+    . $file.FullName
+}
+
+# Dot source public functions
+$publicFiles = Get-ChildItem -Path $PSScriptRoot\Public\*.ps1 -ErrorAction SilentlyContinue
+$publicFunctionNames = @()
+foreach ($file in $publicFiles) {
+    . $file.FullName
+    # Get the function name from the file (assumes filename matches function name)
+    $functionName = $file.BaseName
+    $publicFunctionNames += $functionName
+}
+
+# Export only public functions
+if ($publicFunctionNames.Count -gt 0) {
+    Export-ModuleMember -Function $publicFunctionNames
+}
+
 # Module cleanup on removal
 $MyInvocation.MyCommand.ScriptBlock.Module.OnRemove = {
     Write-PlasterLog -Level Information -Message "Plaster module is being removed"

Plaster/Private/Write-PlasterLog.ps1

@@ -49,9 +49,9 @@ function Write-PlasterLog {
         'Debug'       = 4
     }
 
-    $currentLogLevel = $script:LogLevel ?? 'Information'
-    $currentLevelValue = $logLevels[$currentLogLevel] ?? 2
-    $messageLevelValue = $logLevels[$Level] ?? 2
+    $currentLogLevel = if ($null -ne $script:LogLevel) { $script:LogLevel } else { 'Information' }
+    $currentLevelValue = if ($null -ne $logLevels[$currentLogLevel]) { $logLevels[$currentLogLevel] } else { 2 }
+    $messageLevelValue = if ($null -ne $logLevels[$Level]) { $logLevels[$Level] } else { 2 }
 
     if ($messageLevelValue -gt $currentLevelValue) {
         return