Missing typings for event functions?

Hi there!
I'm trying to write a cloud functions project in typescript. The project has typings for http trigger functions available in the functions.ts under the HttpFunction type. These are very useful as they provide the necessary express types for the request and response objects

However when trying to write an event function triggered by a pub/sub message, for example, there is only the EventFunction type, however the data parameter is missing relevant properties for pub/sub triggers, storage triggers, etc

Start in functions.ts by comparing the existing HttpFunction typings with EventFunction. Identify the missing data properties needed for Pub/Sub and storage triggers, then verify that TypeScript cloud-functions projects can use those trigger-specific properties through the event function types.

Written by the indexing model from the issue text.