angular-split 
Angular UI library to split views and allow dragging to resize areas using CSS flexbox layout.
Documentation and examples: https://angular-split.github.io
Credits
Built by Bertrand Gaillard.
Maintained by: Bram Borggreve (As of 2020).
Previously: Bertrand Gaillard (2016 to 2019)
Crossbrowser testing sponsored by Browser Stack
License
Apache 2.0