def merge_other(self, app: Sphinx, env: BuildEnvironment,
docnames: Set[str], other: BuildEnvironment) -> None:
env.rjs_css_classes = getattr(env, 'rjs_css_classes', []) | getattr(
other, 'rjs_css_classes', [])
def clear_doc(self, app: Sphinx, env: BuildEnvironment,
docname: str) -> None:
env.rjs_css_classes = set()
