PowerShell function `Invoke-XslTransform` for invoking an XSLT

Invoke-XslTransform.ps1

# source: https://paregov.net/blog/19-powershell/24-xslt-processor-with-powershell
function Invoke-XslTransform {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true)][string]$StylesheetUri
        , [Parameter(Mandatory = $true)][string]$InputUri
        , [string]$Destination
        , [switch]$PassThru
        , [switch]$Overwrite
    )

    $ErrorActionPreference = 'Stop';

    if (-not (Test-Path $StylesheetUri)) {
        throw "$StylesheetUri does not exist";
    }
    elseif (-not (Test-Path $InputUri)) {
        throw "$InputUri does not exist";
    }

    $resolvePath = $ExecutionContext.SessionState.Path.GetUnresolvedProviderPathFromPSPath;
    $xsl = [System.Xml.Xsl.XslCompiledTransform]::new();
    $xsl.Load($resolvePath.Invoke($StylesheetUri));

    $passThruOnly = ($PassThru -and (-not ($PSBoundParameters.ContainsKey("Destination"))));

    if ($passThruOnly) {
        $sb = [System.Text.StringBuilder]::new();
        $xmlSettings = [System.Xml.XmlWriterSettings]::new();
        $xmlSettings.Indent = $true;
        $xmlWriter = [System.Xml.XmlWriter]::Create($sb, $xmlSettings);
        $xsl.Transform($InputUri, $xmlWriter);
        $xmlWriter.Dispose();
        $sb.ToString();
    }
    else {
        $resultsPath = & {
            $destinationObj = Get-Item $Destination -ErrorAction SilentlyContinue;

            if ($null -ne $destinationObj) {
                if ($destinationObj -is [System.IO.FileInfo]) {
                    if ($Overwrite) {
                        Remove-Item $Destination;
                    }
                    else {
                        throw "$Destination already exists";
                    }
                }
                elseif ($destinationObj -is [System.IO.DirectoryInfo]) {
                    $stylesheetUriName = (Get-Item $StylesheetUri).BaseName;
                    $inputUriName = (Get-Item $InputUri).BaseName;
                    Join-Path $Destination "${inputUriName}${stylesheetUriName}$([DateTime]::Now.ToString("yyyyMMdd-HH-mm-ss")).xml";
                }
            }
            else {
                $Destination;
            }
        }

        Write-Verbose "Writing to $($resolvePath.Invoke($resultsPath))";    
        $xsl.Transform($resolvePath.Invoke($InputUri), $resolvePath.Invoke($resultsPath));

        if ($PassThru) {
            Get-Content $resultsPath;
        }
    }
}