The main hh-apidoc CLI
hh-apidoc
namespace Facebook\HHAPIDoc; final class GeneratorCLI extends \Facebook\CLILib\CLIWithRequiredArguments {...}
::getHelpTextForRequiredArguments(): vec<string>
->mainAsync(): Awaitable<int>
->getSupportedOptions(): vec<\Facebook\CLILib\CLIOptions\CLIOption>