Not-true-terminating

ThrowTerminatingError produces not true terminating errors

Unlike throw or Write-Error -ErrorAction Stop, $PSCmdlet.ThrowTerminatingError produces not true terminating errors. They terminate the current command but they do not terminate callers unless they use try blocks or $ErrorActionPreference = 'Stop'.

help about_preference_variables says

$ErrorActionPreference

      Neither $ErrorActionPreference nor the ErrorAction common parameter
      affect how Windows PowerShell responds to terminating errors (those
      that stop cmdlet processing).

As far as tests show that $ErrorActionPreference affects how PowerShell responds to errors created by ThrowTerminatingError, it looks like this help confirms that ThrowTerminatingError is not true terminating.

Scripts

• Test-1.1.ThrowTerminatingError.ps1 calls ThrowTerminatingError.
• Test-1.2.ThrowTerminatingError.ps1 calls the above and the script continues.
• Test-2.1.Throw.ps1 calls throw.
• Test-2.2.Throw.ps1 calls the above and the script terminates.
• Test-3.1.Write-Error.ps1 calls Write-Error -ErrorAction Stop.
• Test-3.2.Write-Error.ps1 calls the above and the script terminates.

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• ThrowTerminatingError() errors are not true terminating errors