How to make app exit code match the outcome?

[pasmon]

I get the following error, but the exit code is always "True" at least in Powershell:

TypeError: SomeApp(title='some_tui', classes={'-dark-mode'}) compose() method returned an invalid result; Widget
positional arguments must be Widget subclasses; not 'Some.Resource'

NOTE: 1 of 2 errors shown. Run with --dev to see all errors.
(.venv) PS C:\Users\pasmon\git\azure-tui> $?
True

How to make it return the correct exit code for an app crash, like "False"?

[TomJGooding]

Same result in bash. I wonder if because Textual is async, or something else...?

from textual.app import App, ComposeResult
from textual.widgets import Static


class ExampleApp(App):
    def compose(self) -> ComposeResult:
        yield Static("Hello, world!")

    def on_ready(self) -> None:
        assert 1 == 2


if __name__ == "__main__":
    # Comment out the assert below and `$?` returns an exit code of 0
    assert 1 == 2

    app = ExampleApp()
    app.run()