Now there are :
- Web app builder(WAB) based on Jimu js library which is private;
- Calcite maps, extension of bootstrap, created by one ESRI front end guy. It's UI is better than WAB;
- CLI for vue,react etc;
For the js developers of us, would like to know in the end which one ESRI will prefer?
The last two, only basci framwork available, not any shared widgets avialable such as print, legend, scalebar and so on.