$out = Join-Path $env:TEMP 'console-probe.txt'
$lines = New-Object System.Collections.Generic.List[string]
function L($s) { $lines.Add($s) }
$src = @"
using System;
using System.Runtime.InteropServices;
public static class K32 {
  [DllImport("kernel32.dll", SetLastError=true)] public static extern bool AllocConsole();
  [DllImport("kernel32.dll", SetLastError=true)] public static extern bool FreeConsole();
  [DllImport("kernel32.dll")] public static extern IntPtr GetStdHandle(int n);
  [DllImport("kernel32.dll", SetLastError=true)] public static extern bool GetConsoleMode(IntPtr h, out uint m);
  [DllImport("kernel32.dll", SetLastError=true)] public static extern bool SetConsoleMode(IntPtr h, uint m);
  [DllImport("kernel32.dll")] public static extern IntPtr GetConsoleWindow();
}
"@
Add-Type -TypeDefinition $src -ErrorAction Stop
$hwndBefore = [K32]::GetConsoleWindow()
L ("PSVersion            : " + $PSVersionTable.PSVersion)
L ("CLR                  : " + [System.Environment]::Version)
L ("GetConsoleWindow(before AllocConsole) : " + $hwndBefore)
$ok = [K32]::AllocConsole()
L ("AllocConsole()       : " + $ok)
$hOut = [K32]::GetStdHandle(-11); $hIn = [K32]::GetStdHandle(-10)
$mOut = 0; $mIn = 0
$okOut = [K32]::GetConsoleMode($hOut, [ref]$mOut)
$okIn  = [K32]::GetConsoleMode($hIn, [ref]$mIn)
L ("STDOUT GetConsoleMode: " + $okOut + "  mode=0x" + ('{0:X}' -f $mOut))
L ("STDIN  GetConsoleMode: " + $okIn  + "  mode=0x" + ('{0:X}' -f $mIn))
L ("  STDOUT ENABLE_VIRTUAL_TERMINAL_PROCESSING (0x0004) : " + (($mOut -band 4) -eq 4))
L ("  STDOUT ENABLE_PROCESSED_OUTPUT            (0x0001) : " + (($mOut -band 1) -eq 1))
L ("  STDOUT ENABLE_WRAP_AT_EOL_OUTPUT          (0x0002) : " + (($mOut -band 2) -eq 2))
L ("  STDIN  ENABLE_VIRTUAL_TERMINAL_INPUT      (0x0200) : " + (($mIn -band 0x200) -eq 0x200))
$raw = $Host.UI.RawUI
$vtProp = $raw | Get-Member -Name SupportsVirtualTerminal -ErrorAction SilentlyContinue
$rawMembers = ($raw | Get-Member -MemberType Property | Select-Object -ExpandProperty Name) -join ','
L ("RawUI property list : " + $rawMembers)
L ("RawUI has SupportsVirtualTerminal member? " + [bool]$vtProp)
try { L ("RawUI.SupportsVirtualTerminal value : [" + $raw.SupportsVirtualTerminal + "]") } catch { L ("RawUI.SupportsVirtualTerminal THREW: " + $_.Exception.Message) }
try { L ("`$Host.UI.SupportsVirtualTerminal   : [" + $Host.UI.SupportsVirtualTerminal + "]") } catch { L ("`$Host.UI.SupportsVirtualTerminal THREW: " + $_.Exception.Message) }
L ("[Console]::OutputEncoding : " + [Console]::OutputEncoding.WebName)
L ("[Console]::IsOutputRedirected : " + [Console]::IsOutputRedirected)
L ("[Console] ReinitCheck : skipped")
$w = $raw.WindowSize; $b = $raw.BufferSize
L ("RawUI.WindowSize : " + $w.Width + "x" + $w.Height)
L ("RawUI.BufferSize : " + $b.Width + "x" + $b.Height)
# activate VT and re-read
$okSet = [K32]::SetConsoleMode($hOut, $mOut -bor 4)
$mOut2 = 0
[void][K32]::GetConsoleMode($hOut, [ref]$mOut2)
L ("SetConsoleMode(out, mode|0x4) : " + $okSet + "  -> new mode=0x" + ('{0:X}' -f $mOut2))
$tmp = join-path $env:TEMP 'vt-write-test.txt'
$lines | Set-Content -Path $tmp -Encoding UTF8
Write-Host ""
Write-Host "=== PROBE OUTPUT ON ATTACHED CONSOLE ===" -ForegroundColor Cyan
Write-Host "Try ANSI: [31mRED[0m [32mGREEN[0m" 
$lines | ForEach-Object { Write-Host $_ }
Write-Host "=== END ===" -ForegroundColor Cyan
Start-Sleep -Seconds 2
[void][K32]::FreeConsole()