Trying to play the helloCharacter level, crashes the editor...
After a little bit of debugging the problem lives in this two functions, even spawning only one character, crashes the engine.

function createCharacter() {
        let pos = randomPoint()
        pos.Z += 100

        // All UObject has static function .C({UObject}), which just return its input arg.
        // But *.d.ts has proper type signature for those functions, so we can enjoy
        // auto-completion!
        let character = Character.C(new MyCharacter_C(GWorld,pos))
        character.SpawnDefaultController()

        let controller = AIController.C(character.Controller)

        function wander() {
            controller.MoveToLocation(randomPoint(),-1,true,true,false,false)
        }

        // Move completed?
        controller.ReceiveMoveCompleted.Add( (reqid,status) => {
            wander()
        })

        wander()

        return character
    }

    
    // spawn 20 characters
    let characters = _.range(0,1).map(()=>{
        while (true) {
            try {
                return createCharacter()
            }
            catch (e) {
            }
        }
    })

Edit : After trying this pluggin for 4 hours in the JavascriptPlayground, and testing other examples, i came to the conclusion that without a proper documentation, or functioning examples, its almost impossible to learn this pluggin. For instance, my last test, was to change game mode in the for a simple one in the helloInputbinding level and set the default pawn to custom one, with it i've placed the helloInputBinding script and removed from the level the actor came with it, and the engine crashed.