As the main development framework for SharePoint, the latest 1.8 version of the SharePoint Framework just become generally available with the following additions for developers :
- SPFx development of Teams Tabs : Yeah !!!!
- App Pages : Yeah !!!
- Web parts in Isolated Domains
- Library Components (preview)
- Support for TypeScript 2.7, 2.9 and 3.x
- Support for Section background styling on modern pages
- Deprecating legacy Fabric CSS consumption
You can read all the additions on the release note located here.