Hi all,
this proposal is related to the other issue (about documentation/general discussion on the same topic) seen in issue#1647, but this is related to code updates/simplifications.

🚀 Feature Proposal

Update and simplify code to use at least Node.js 8.x (since its LTS release) features.

Motivation

Because previous releases are no more under support, and the majority of installations now seems to be with Node.js 8.x or 10.x .
This would even improve the (right) perception that Fastify is aligned with the state-of-the-art Node.js using latest stable features.

All changes to be done in the 'next' branch.

Example

Search for code block referring to old Node.js versions (if any) and update/remove as needed.
Remove some of the conditionals for async/await and http2 in the tests.