flat directory file dependency solution

script.ps1

#!/usr/bin/env pwsh
#Requires -Version 7
param([string] $path);
Push-Location -Path $path;
function order([string] $Path) {
  [Collections.Stack] $stack = [Collections.Stack]::new();
  foreach ($file in (Get-ChildItem -Path $Path -Filter '*.txt')) {
    [void] $stack.Push($file.Name);
    $file | Get-Content | ForEach-Object {
      [string]::IsNullOrEmpty($_) ? (&{return}) : (order($_));
    }
  }
  return $stack.ToArray();
}
order -Path $path | Select-Object -Unique;
Pop-Location;