invoker.cs

        public Func<IDictionary<string, object>, Task<object>> Invoke(Func<IDictionary<string, object>, object> executor)
        {
            Func<IDictionary<string, object>, Task<object>> invoker = null;

            if (executor.Method.ReturnType != typeof (Task<object>))
            {
                invoker =
                    p =>
                    {
                        var task = new Task<object>(() => executor(p));
                        task.Start();
                        return task;
                    };
            }
            else
            {
                invoker = p => (Task<object>) executor(p);
            }
            return invoker;
        }

new.js

var edge = require('edge');

var hello = edge.func('scs', function() {/*
Invoke(d=>d["value"])
*/});

hello({"value": "Hello from scriptcs"}, function(error,result) {
    if (error) throw error;
    console.log(result.Result);
}); 

old.js

var edge = require('edge');
var hello = edge.func('scs', function() {/*
Func<IDictionary<string,object>, Task<object>> execute = p=> Task.FromResult<object>(p["value"]); 
execute
*/});
hello({"value": "Hello from scriptcs"}, function(error,result) {
    if (error) throw error;
    console.log(result.Result);
});