def context(app: Optional[Any] = None) -> Lens:
        """DEPRECATED: Select the context (retrieval step outputs) of the given
        app."""

        if app is None:
            raise ValueError("App must be given to select context.")

        return app.select_context(app)
DEPRECATED: Select the context (retrieval step outputs) of the given
        app.
src/core/trulens/core/schema/select.py