PublishError class is not exported by the package. This blocks developer from pointing using it as a type for method signature in typescript:

What I would like to achieve is:

import { PublishError } from '@google-cloud/pubsub'

export const onError = (error: PublishError): void => {
   ...
}

Currently, I can only achieve this by importing from module src, which is not ideal...

import { PublishError } from '@google-cloud/pubsub/build/src/publisher/publish-error'