I have tested this item ✅ successfully on 8bac562

Deprecation logging shows class name in correct case now. Also, navigate to random pages and it is still working as expected

Not related to this but StubGenerator still generate class name is lower case :(

Not related to this but StubGenerator still generate class name is lower case :(

It's because it uses the $classAlias property which is written to with lowercased aliases. FWIW Nicholas' tool just parses out the libraries/classmap.php file to get a list of classes, so he's not really using the API either and the output from his tool is fine (but he's also supporting more versions with his tool and all the API pieces aren't consistently there).

StubGenerator may be able to be updated to use JLoader::getDeprecatedAliases() as that would have the correctly cased aliases and it would allow us to generate a stub class doc block with a @deprecated <version> tag so that IDEs also report the aliases as deprecated (this was one of the complaints I had seen about our script that Nicholas' tool addresses).

Yes, use JLoader::getDeprecatedAliases() solves that issue, thanks

public function doExecute()
{
	$file = "<?php\n";

	foreach (JLoader::getDeprecatedAliases() as $deprecation)
	{
		$oldName = $deprecation['old'];
		$newName = $deprecation['new'];

		// Figure out if the alias is for a class or interface
		$reflection = new ReflectionClass($newName);
		$type       = $reflection->isInterface() ? 'interface' : 'class';
		$modifier   = ($reflection->isAbstract() && !$reflection->isInterface()) ? 'abstract ' : '';

		$file .= "$modifier$type $oldName extends $newName {}\n";
	}
	// And save the file locally
	file_put_contents(JPATH_ROOT . '/stubs.php', $file);

	$this->out('Stubs file written', true);
}