def postprocess_transformers(self) -> list[cirq.TRANSFORMER]:
        """List of transformers which should be run after decomposing individual operations.

        If `eject_paulis` is enabled in the constructor, adds `cirq.eject_phased_paulis` and
        `cirq.eject_z` in addition to postprocess_transformers already available in
        `cirq.CompilationTargetGateset`.
        """
        transformers: list[cirq.TRANSFORMER] = [
            cirq.create_transformer_with_kwargs(
                cirq.merge_single_qubit_moments_to_phxz, atol=self.atol
            ),
            cirq.create_transformer_with_kwargs(cirq.drop_negligible_operations, atol=self.atol),
            cirq.drop_empty_moments,
        ]

        if self.eject_paulis:
            return (
                transformers[:1]
                + [
                    cirq.create_transformer_with_kwargs(cirq.eject_phased_paulis, atol=self.atol),
                    cirq.create_transformer_with_kwargs(cirq.eject_z, atol=self.atol),
                ]
                + transformers[1:]
            )
        return transformers
List of transformers which should be run after decomposing individual operations.

        If `eject_paulis` is enabled in the constructor, adds `cirq.eject_phased_paulis` and
        `cirq.eject_z` in addition to postprocess_transformers already available in
        `cirq.CompilationTargetGateset`.
        
cirq-google/cirq_google/transformers/target_gatesets/google_cz_gateset.py