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Your Google Cloud Function can be triggered by different event sources. Those event sources can be defined and configured with the help of the event event.

#Event events

This example sets up a pubSub event which will trigger the first function whenever a message is published to the my-topic topic.

# serverless.yml

    handler: pubSub
      - event:
          eventType: providers/cloud.pubsub/eventTypes/topic.publish
          resource: 'projects/${self:provider.project, ""}/topics/my-topic'
// index.js

exports.pubSub = (event, callback) => {
  console.log('Hello World!');

Note: See the documentation about the function handlers to learn how your handler signature should look like to work this type of event.