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Might this be acceptable:
```const eventSource = new gcp.pubsub.Topic("event-source", null, {
	retainOnDelete: true,
	import:
		"/projects/&lt;project&gt;/topics/&lt;topic&gt;",
});```

hmm.
Maybe this?
```Topic.prototype.onMessagePublished(requests, ...)```


Though looking at the code, you may as well use `cloudfunctions.CallbackFunction` directly.
<https://github.com/pulumi/pulumi-gcp/blob/master/sdk/nodejs/pubsub/zMixins.ts#L82>

Oh yeah. That looks pretty clean. Thanks!