internal/configurationvalidation/string.ps1

Register-PSFConfigValidation -Name "string" -ScriptBlock {
    Param (
        $Value
    )
    
    $Result = New-Object PSObject -Property @{
        Success = $True
        Value   = $null
        Message = ""
    }
    
    try
    {
        # Seriously, this should work for almost anybody and anything
        [string]$data = $Value
    }
    catch
    {
        $Result.Message = "Not a string: $Value"
        $Result.Success = $False
        return $Result
    }
    
    if ([string]::IsNullOrEmpty($data))
    {
        $Result.Message = "Is an empty string: $Value"
        $Result.Success = $False
        return $Result
    }
    
    if ($data -eq $Value.GetType().FullName)
    {
        $Result.Message = "Is an object with no proper string representation: $Value"
        $Result.Success = $False
        return $Result
    }
    
    $Result.Value = $data
    
    return $Result
}