A blast from the past -- and it just might do the trick

http://www.fastcolabs.com/3016289/how-an-arcane-coding-method-from-1970s-banking-software-could-save-the-sanity-of-web-develop




http://noflojs.org/
NoFlo is a Flow-Based Programming environment for JavaScript. In flow-based programs, the logic of your software is defined as a graph. The nodes of the graph are instances of NoFlo components, and the edges define the connections between them.

NoFlo components react to incoming messages, or packets. When a component receives packets in its input ports it performs a predefined operation, and sends its result out as a packet to its output ports. There is no shared state, and the only way to communicate between components is by sending packets.