With the in progress fastify core refactor (#1475) I'd like to work on our overall TypeScript support. I'm going to assign this task to myself and see what I can come up with. A lot of what I'll be doing is currently just ideas I have. I don't know what will stick and what wont so I'll see where it goes as I work on it!

Some ideas I have at the moment include:

• better TypeScript testing
• improving docs on types for plugins
• improving internal type coverage
  I know not everyone relies on internal types, but it would be great to have for editor integration. This is probably going to be the hardest task but I'd like to investigate nonetheless.
• decoupling of types for better maintenance
  With all of the types jammed into one file it can be hard to maintain. As most of fastify is being refactored into individual things I'd like to investigate a similar structure with the typings.

If you have any preliminary feedback or ideas, lets discuss 😄

(also I want to be clear that any changes I make will not impact the non-typed dev experience with Fastify as I know that is a value we uphold in this project 👍)