How to friend Angular and React in the same application

Once the owner of Invent.us startup, where Maxim works, came up with the idea to have the Angular team help the React team create a new application. The app was a board with widgets in the form of tiles. Each widget had its own specific functionality. The Angular team's task was to make an Angular widget and run it inside the React application. And the appearance, animation, fonts, indents had to be the same as React widgets. This required creating a UI kit identical to the one on React, or somehow using the React UI kit inside Angular. 

This talk about the long and painful journey to get Angular running and working correctly inside React, and how Angular UI kit was made, with a complex facade for React UI kit at its core.