How to use the @grpc/grpc-js.status.OK function in @grpc/grpc-js

it('should return true for retryable errors', () => {
      [
        status.OK,
        status.CANCELLED,
        status.UNKNOWN,
        status.DEADLINE_EXCEEDED,
        status.RESOURCE_EXHAUSTED,
        status.ABORTED,
        status.INTERNAL,
        status.UNAVAILABLE,
        status.DATA_LOSS,
      ].forEach((code: status) => {
        const shouldRetry = retrier.retry({code} as StatusObject);
        assert.strictEqual(shouldRetry, true);
      });
    });

it('should reset the failure count on OK', () => {
      retrier.retry({code: status.CANCELLED} as StatusObject);
      retrier.retry({code: status.OK} as StatusObject);

      assert.strictEqual(retrier.createTimeout(), 0);
    });

retry(err: StatusObject): boolean {
    if (err.code === status.OK || err.code === status.DEADLINE_EXCEEDED) {
      this.failures = 0;
    } else {
      this.failures += 1;
    }

    return RETRY_CODES.includes(err.code);
  }
}

constructor (stream) {
    super();
    this.handler = null;
    this.stream = stream;
    this.cancelled = false;
    this.deadline = null;
    this.compression = new CompressionFilter();
    this.metadataSent = false;
    this.status = { code: Status.OK, details: 'OK', metadata: null };
    this.stream.on('drain', onStreamDrain.bind(this));
    this.stream.once('error', onStreamError.bind(this));
    this.stream.once('close', onStreamClose.bind(this));
  }

*
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import {StatusObject, status} from '@grpc/grpc-js';

/*!
 * retryable status codes
 */
export const RETRY_CODES: status[] = [
  status.OK,
  status.CANCELLED,
  status.UNKNOWN,
  status.DEADLINE_EXCEEDED,
  status.RESOURCE_EXHAUSTED,
  status.ABORTED,
  status.INTERNAL,
  status.UNAVAILABLE,
  status.DATA_LOSS,
];

/**
 * Used to track pull requests and determine if additional requests should be
 * made, etc.
 *
 * @class
 * @private