Sort-ClassFile.ps1

$classFolder = "c:\dev\myproject\classes"
$files = Get-ChildItem $classFolder -Filter *.ps1 -Recurse
$typesList = [System.Collections.Generic.List[PsObject]]::New()

foreach ($file in $files) {
    $ast = [System.Management.Automation.Language.Parser]::ParseFile($file.FullName, [ref]$null, [ref]$null)

    $typeNames = $ast.FindAll( {$args[0] -is [System.Management.Automation.Language.TypeDefinitionAst]}, $true) | Select-Object -ExpandProperty Name
    $typesList.Add([PSCustomObject]@{
            FilePath     = $file.FullName
            Types        = $typeNames
            Dependencies = [System.Collections.Generic.List[String]]::New()
            Ast          = $ast
        }
    )
}


foreach ($typeObj in $typesList) {
    $typesToCheck = $typeObj.Ast.BaseTypes.TypeName

    foreach ($t in $typesToCheck) {
        if ($dependentType = ($typesList.Where{$_.Types -contains $t.Name})[0]) {
            if ($dependentType.FilePath -ne $typeObj.FilePath -and
                $typeObj.Dependencies -notcontains $dependentType.FilePath) {
                $typeObj.Dependencies.Add($dependentType.FilePath)
            }
        }           
    } 
}


while ($typesList.Count -gt 0) {
    WRite-Verbose "$($typesList.Count)"
    foreach ($typeObj in $typesList.Where{$_.Dependencies.Count -eq 0}) {
        
        foreach ($t in $typesList) {
            [void]$t.Dependencies.Remove($typeObj.FilePath)
        }

        [void]$typesList.Remove($typeObj)
        
        $typeObj.FilePath
    }

}