TypeError: channelCredentials._equals is not a function

This issue occurs on versions 1.1.2 and later.

When attempting to publish a message to the emulator, I’m getting the following error:

TypeError: channelCredentials._equals is not a function

Function to re-create error:

const pub = async (topicName, data) => {
  const options = {
    keyFilename,
    projectId
  };
  if (process.env.NODE_ENV === 'development' || process.env.NODE_ENV === 'test') {
    options.apiEndpoint = 'emulator:8085';
  }
  const pubsub = new PubSub(options);
  const stringifiedData = JSON.stringify(data);
  const dataBuffer = await Buffer.from(stringifiedData);

  const topic = `projects/${projectId}/topics/${topicName}`;

  return pubsub
    .topic(topic)
    .publish(dataBuffer)
    .then((response) => {
      logger.info('Message published.', response);
      return {
        success: true
      };
    })
    .catch((error) => {
      logger.error('Failed to publish topic', error);
      return {
        success: false
      };
    });
};

Dockerfile of emulator:

FROM google/cloud-sdk:alpine

LABEL maintainer="LADbible Group"

RUN apk --update add openjdk7-jre
RUN gcloud components install --quiet beta pubsub-emulator
RUN gcloud components update
RUN mkdir -p /var/pubsub

VOLUME /var/pubsub

EXPOSE 8085

CMD [ "gcloud", "beta", "emulators", "pubsub", "start", "--data-dir=/var/pubsub", "--host-port=0.0.0.0:8085", "--log-http", "--verbosity=debug", "--user-output-enabled" ]

Environment details

• OS: alpine
• Node.js version: 10.15.0
• npm version: 6.5.0
• @google-cloud/pubsub version: 1.1.2+

[kbariotis]

Found the same when attempting to connect to the emulator. Latest version of both the emulator and this library.

[meredithslota]

@feywind If the issue isn’t resolved with the new version of grpc-js (and it’s still an issue with the emulator) let’s kick it to @kamalaboulhosn for guidance on ownership.