can we make with just one code base our application for ( web and android/ios ) application? something like flutter do for us with dart
This is still in an experimental stage so a lot of work still has to be done, but it already works. It’s probably a bit more work right now since you at least need to build some kind of interface to all the platform stuff (basic UI, input etc), but you should be able to share most of the code between platforms. This will probably get easier as more libraries get published.