Powershell script to delete empty folders recursively while ignoring specific file types

Delete-empty-folders-recursively-ignore-types.ps1

# Used for deleting folders to the Recycling Bin.
Add-Type -AssemblyName Microsoft.VisualBasic

# File types to ignore.
$excluded = @(".txt", ".ini")

# Recursive deletion function
function Delete-Folders-Recursively {

    param (
        $DirectoryPath
    )

    # Checks first if folder has subfolders.
    # If true, then invokes function on children before moving to next step.
    $subfolders = [System.Collections.Generic.List[string]]::new()
    Get-ChildItem -Directory -force -LiteralPath $DirectoryPath | % { $subfolders.add($_.FullName) }
    if ($subfolders.Count -gt 0) {
        $subfolders | % { Delete-Folders-Recursively $_ }
    }

    # After potential subfolders have been removed,
    # checks if current folder is empty except for ignored file types.
    # If true, folder will be counted as empty and will be deleted.
    if ((Get-ChildItem -force -LiteralPath $DirectoryPath | Where-Object { $excluded.IndexOf($_.Extension) -eq -1 }).count -eq 0) {
        # Prints the directory path of the folder which is about to be delted
        Write-Verbose -Message ("Removing {0}" -f $DirectoryPath) -Verbose

        # V1
        # Irreversable deletion
        # Remove-Item -Force -Recurse -Confirm:$false -LiteralPath $DirectoryPath

        # V2
        # Deletes folder to Recycling Bin
        [Microsoft.VisualBasic.FileIO.FileSystem]::DeleteDirectory($DirectoryPath, 'OnlyErrorDialogs', 'SendToRecycleBin')
    }
}

# V1
# Gets all Root subfolders and executes the recursive deletion on them,
# leaving Root out of the process.
# Get-ChildItem -Directory -force | % { Delete-Folders-Recursively $_.FullName }

# V2
# Deletes all empty folders including Root.
# (Although, will never happen with this version, as the script is located in Root.)
Delete-Folders-Recursively $PSScriptRoot