It may be possible, but I haven't seen such a tool. I have seen tools where you edited the syntax tree via a GUI and it was terrible for writing code. It may wo

It may be possible, but I haven't seen such a tool. I have seen tools where you edited the syntax tree via a GUI and it was terrible for writing code. It may work better for tree modifications. Text programs are pretty efficent when writing, editing code, because you can access a large number of elements quickly with the syntax. E.g. writing let a = 3 can be much quicker than starting some command palette from the keyboard, choosing the "declare variable" action and then fill some dialog with the name and value of the variable. I have doubts it can be made as efficient as typing, otherwise we would have seen such prototypes already. Have you?