PowerShell function to Get Windows Local Group Members via WMI - Returns a PSObject

Get-WMILocalGroupMember.ps1

function Get-WMILocalGroupMember {
    [CmdletBinding()]
    [OutputType([PSObject])]
    param (
        [Parameter()]
        [String]
        $ComputerName = $env:computername,
        [Parameter()]
        [String]
        $GroupName
    )
    $localGroups = get-wmiobject win32_Group -Filter "LocalAccount = 'True'"
    if ($GroupName) {
        $localGroups = $localGroups | Where-Object Name -eq $GroupName
    }
    
    $output = foreach ($group in $localGroups) {
        $localGroupMembers = Get-WmiObject -Class Win32_GroupUser -Filter "GroupComponent=""Win32_Group.Domain='$ComputerName',Name='$($group.Name)'""" -ComputerName $ComputerName
        $parsedLocalGroupMembers = $localGroupMembers | ForEach-Object {
            $_.partcomponent -match ".+Domain\=(.+)\,Name\=(.+)$" > $nul
            [PSCustomObject] @{
                User       = $matches[1].trim('"') + "\" + $matches[2].trim('"')
                UserDomain = $matches[1].trim('"')
                UserName   = $matches[2].trim('"')
            }
        }
        foreach ($member in $parsedLocalGroupMembers) {
            [PSCustomObject] @{
                ComputerName = $ComputerName
                GroupName    = $group.Name
                GroupDomain  = $group.Domain
                GroupSID     = $group.SID
                User         = $member.User
                UserDomain   = $member.UserDomain
                UserName     = $member.UserName
            }
        }
    }
    return $output
}

Fixed so that when run on a Domain Computer only Local Groups are queried.