Display highly visible notification if the last command failed in the Microsoft Terminal using PowerShell

redalert.ps1

# Put this code in your PowerShell profile script
# This requires the MSTerminalSettings module which you can download with:
# Install-Module MSTerminalSettings -Scope CurrentUser -Repository PSGallery

Import-Module MSTerminalSettings
$msTermProfileName = 'pwsh' # Replace with whatever Terminal profile name you're using
$msTermProfile     = Get-MSTerminalProfile -Name $msTermProfileName
$script:bombThrown = $false
function prompt {
    if ($? -eq $false) {
        # RED ALERT!!!
        # Only do this if we're using Microsoft Terminal
        if ((Get-Process -Id $PID).Parent.Parent.ProcessName -eq 'WindowsTerminal') {
            Set-MSTerminalProfile -Name $msTermProfile.name -BackgroundImage 'https://media.giphy.com/media/HhTXt43pk1I1W/giphy.gif' -UseAcrylic:$false
            $script:bombThrown = $true
        }
    } else {
        # Reset to previous settings
        if ($script:bombThrown) {
            Set-MSTerminalProfile -Name $msTermProfile.name -BackgroundImage $msTermProfile.backgroundImage -UseAcrylic:$msTermProfile.useAcrylic
            $script:bombThrown = $false
        }
    }
}

You might consider adding a blowoff valve for robocopy:

The return code from Robocopy is a bitmap, defined as follows:

    Hex   Decimal  Meaning if set

    0×00   0       No errors occurred, and no copying was done.
                   The source and destination directory trees are completely synchronized. 

    0×01   1       One or more files were copied successfully (that is, new files have arrived).

    0×02   2       Some Extra files or directories were detected. No files were copied
                   Examine the output log for details. 

    0×04   4       Some Mismatched files or directories were detected.
                   Examine the output log. Housekeeping might be required.

    0×08   8       Some files or directories could not be copied
                   (copy errors occurred and the retry limit was exceeded).
                   Check these errors further.

    0×10  16       Serious error. Robocopy did not copy any files.
                   Either a usage error or an error due to insufficient access privileges
                   on the source or destination directories.