socket-mode: Type event payloads

I'm using @slack/socket-mode in a TypeScript project and would love to be able to benefit from type definitions when defining event handlers -- e.g. when I invoke something along the lines of

socketModeClient.on(
  'reaction_added',
  async (event) => {
    ...
  }
);

I'd like event to not be of the any type but instead to reflect the expected type for the event in question.

It looks like there are libraries that might support this, for your consideration.

Packages:

Select all that apply:

• @slack/web-api
• @slack/rtm-api
• @slack/webhooks
• @slack/oauth
• @slack/socket-mode
• @slack/types
• I don't know

Requirements

Please read the Contributing guidelines and Code of Conduct before creating this issue or pull request. By submitting, you are agreeing to those rules.

Start in the @slack/socket-mode event-handler API and inspect how TypeScript declarations currently type callbacks. Consider the linked typed-emitter library, then verify that a reaction_added handler receives its expected event payload rather than any.