🐛 Avoid printing additional output with no_args_is_help=True and Click 8.2

tests/test_tutorial/test_commands/test_index/test_tutorial003.py

@@ -18,6 +18,13 @@ def test_no_arg():
     assert "delete" in result.output
 
 
+def test_no_additional_output():
+    """Ensure that no additional output was generated (cf. PR #1262)"""
+    result = runner.invoke(app)
+    assert result.output.count("Usage") == 1
+    assert "Error" not in result.output
+
+
 def test_create():
     result = runner.invoke(app, ["create"])
     assert result.exit_code == 0

typer/rich_utils.py

@@ -693,6 +693,10 @@ def rich_format_error(self: click.ClickException) -> None:
     Called by custom exception handler to print richly formatted click errors.
     Mimics original click.ClickException.echo() function but with rich formatting.
     """
+    # Don't do anything when it's a NoArgsIsHelpError (without importing it, cf. #1278)
+    if self.__class__.__name__ == "NoArgsIsHelpError":
+        return
+
     console = _get_rich_console(stderr=True)
     ctx: Union[click.Context, None] = getattr(self, "ctx", None)
     if ctx is not None: