style: fix PSScriptAnalyzer violations across all source files

PSAvoidTrailingWhitespace (73):
  Strip trailing whitespace from all .ps1/.psm1 files under PSDepend/ and Tests/

PSPossibleIncorrectComparisonWithNull (4):
  Move $null to left-hand side in GitHub.ps1, Npm.ps1, Sort-WithCustomList.ps1

PSAvoidUsingCmdletAliases (1):
  Replace `select` with Select-Object in Invoke-PSDepend.ps1

PSUseOutputTypeCorrectly (27):
  Add [OutputType(...)] to Get-PSDependScript, Invoke-PSDepend, Sort-PSDependency,
  Test-Dotnet, Test-PlatformSupport, Validate-DependencyParameters,
  New-TestCredential, and Test-PSDependTypeSupportedHere

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: HeyItsGilbert

PSDepend/PSDepend.psm1

@@ -1,4 +1,4 @@
-#Get public and private function definition files.
+#Get public and private function definition files.
     $Public  = @( Get-ChildItem -Path $PSScriptRoot\Public\*.ps1 -ErrorAction SilentlyContinue )
     $Private = @( Get-ChildItem -Path $PSScriptRoot\Private\*.ps1 -ErrorAction SilentlyContinue )
     $ModuleRoot = $PSScriptRoot

PSDepend/PSDependScripts/Chocolatey.ps1

@@ -1,4 +1,4 @@
-<#
+<#
     .SYNOPSIS
     Installs a Chocolatey package a repository.
 
@@ -306,4 +306,4 @@ if ($PSDependAction -contains 'Install') {
 }
 elseif ($PSDependAction -contains 'Test' -and $PSDependAction.count -eq 1) {
     return $false
-}
+}

PSDepend/PSDependScripts/Command.ps1

@@ -1,4 +1,4 @@
-<#
+<#
     .SYNOPSIS
         Invoke a PowerShell command
 
@@ -13,12 +13,12 @@
             Source: The code to run
             Parameters:
                 FailOnError: If specified, throw a terminating error if the command errors out.
-    
+
     .PARAMETER PSDependAction
         Only option is to install the module.  Defaults to Install
 
         Install: Install the dependency
-    
+
     .PARAMETER Dependency
         Dependency to process
 
@@ -63,4 +63,4 @@ foreach ($Depend in $Dependency) {
             }
         }
     }
-}
+}

PSDepend/PSDependScripts/DotnetSdk.ps1

@@ -1,4 +1,4 @@
-<#
+<#
     .SYNOPSIS
         Installs the .NET Core SDK.
 

PSDepend/PSDependScripts/FileDownload.ps1

@@ -1,4 +1,4 @@
-<#
+<#
     .SYNOPSIS
         Download a file
 
@@ -111,7 +111,7 @@ else {
         $FileName = Parse-URLForFile -URL $URL
     }
     $Path = Join-Path $Target $FileName
-        
+
     if (Test-Path $Path -PathType Leaf) {
         Write-Verbose "Skipping existing file [$Path]"
         if ($PSDependAction -contains 'Test') {
@@ -137,7 +137,7 @@ if ($PSDependAction -contains 'Install' -and $ToInstall) {
     Get-WebFile -URL $URL -Path $Path
 }
 
-if ($Dependency.AddToPath) {   
+if ($Dependency.AddToPath) {
     Write-Verbose "Setting PATH to`n$($PathToAdd, $env:PATH -join ';' | Out-String)"
     Add-ToItemCollection -Reference Env:\Path -Item $PathToAdd
 }

PSDepend/PSDependScripts/FileSystem.ps1

@@ -1,4 +1,4 @@
-<#
+<#
     .SYNOPSIS
         EXPERIMENTAL: Use Robocopy or Copy-Item for folder and file dependencies, respectively.
 
@@ -86,7 +86,7 @@ foreach ($Source in @($Sources)) {
         continue
     }
     $IsContainer = ( Get-Item $Source ).PSIsContainer
-    
+
     # Resolve PSDrives.
     $Target = $ExecutionContext.SessionState.Path.GetUnresolvedProviderPathFromPSPath($Target)
     $Source = $ExecutionContext.SessionState.Path.GetUnresolvedProviderPathFromPSPath($Source)
@@ -172,4 +172,4 @@ if ($PSDependAction -like 'Import') {
         }
     }
     Import-PSDependModule $ImportPath
-}
+}

PSDepend/PSDependScripts/Git.ps1

@@ -1,4 +1,4 @@
-<#
+<#
     .SYNOPSIS
         Clone a git repository
 
@@ -68,7 +68,7 @@ param(
     [string[]]$PSDependAction = @('Install'),
 
     [string]$ImportPath,
-    
+
     [bool]$ExtractProject = $False
 )
 
@@ -170,7 +170,7 @@ elseif ($GottaInstall -and $ExtractProject) {
 
     $null = New-Item -ItemType Directory -Path $OutPath -Force
     Push-Location $OutPath
-    
+
     Write-Verbose -Message "Cloning dependency [$GitName] with git from [$($Target)]"
     Invoke-ExternalCommand git 'clone', $Name
 
@@ -198,7 +198,7 @@ elseif ($GottaInstall -and $ExtractProject) {
 if ($Dependency.AddToPath) {
     Write-Verbose "Setting PSModulePath to`n$($Target, $env:PSModulePath -join ';' | Out-String)"
     Add-ToItemCollection -Reference Env:\PSModulePath -Item (Get-Item $Target).FullName
-    
+
     Write-Verbose "Setting PATH to`n$($RepoPath, $env:PATH -join ';' | Out-String)"
     Add-ToItemCollection -Reference Env:\PATH -Item (Get-Item $Target).FullName
 }

PSDepend/PSDependScripts/GitHub.ps1

@@ -1,4 +1,4 @@
-<#
+<#
     .SYNOPSIS
         Installs a module from a GitHub repository.
 
@@ -313,7 +313,7 @@ if ($ShouldInstall) {
     $Page = 0
 
     try {
-        :nullcheck while ($GitHubVersion -Eq $null) {
+        :nullcheck while ($null -eq $GitHubVersion) {
             $Page++
             [Net.ServicePointManager]::SecurityProtocol = [Net.ServicePointManager]::SecurityProtocol -bor [Net.SecurityProtocolType]::Tls12
             $GitHubTags = Invoke-RestMethod -Uri "https://api.github.com/repos/$DependencyID/tags?per_page=100&page=$Page"

PSDepend/PSDependScripts/Noop.ps1

@@ -1,4 +1,4 @@
-<#
+<#
     .SYNOPSIS
         Display variables that a dependency script would receive.
 
@@ -31,4 +31,4 @@ Write-Verbose "Starting noop run with $($Dependency.count) sources"
     DependencyParameters = $Dependency.Parameters
     GetVariable          = (Get-Variable)
     ENV                  = Get-ChildItem ENV:
-}
+}

PSDepend/PSDependScripts/Npm.ps1

@@ -1,4 +1,4 @@
-<#
+<#
     .SYNOPSIS
         Install a node package from NPM.
 
@@ -18,7 +18,7 @@
 
     .PARAMETER Dependency
         Dependency to process
-    
+
     .PARAMETER Global
         If specified, the node package will be installed globally.
 
@@ -96,10 +96,10 @@ If ($PSDependAction -contains 'Test') {
         Pop-Location
     }
     $InstalledModule = $InstalledNodeModules.$Name
-    If ($InstalledModule -eq $null) {
+    If ($null -eq $InstalledModule) {
         return $false
     }
-    ElseIf ($Version -ne $null -and $InstalledModule.Version -ne $Version) {
+    ElseIf ($null -ne $Version -and $InstalledModule.Version -ne $Version) {
         return $false
     }
     Else {
@@ -121,4 +121,4 @@ If ($PSDependAction -contains 'Install') {
         Pop-Location
     }
 }
-#endregion Install Action
+#endregion Install Action