def postprocess_transformers(self) -> list[cirq.TRANSFORMER]:
        """List of transformers which should be run after decomposing individual operations."""
        processors: list[cirq.TRANSFORMER] = [
            merge_single_qubit_gates.merge_single_qubit_moments_to_phxz,
            transformers.drop_negligible_operations,
            transformers.drop_empty_moments,
        ]
        if not self._preserve_moment_structure:
            processors.append(transformers.stratified_circuit)
        return processors
List of transformers which should be run after decomposing individual operations.
cirq-core/cirq/transformers/target_gatesets/compilation_target_gateset.py