2-way binding for computationally expensive effects

[bergwerf]

I have an object that describes a diagram that is rendered in a WYSIWYG editor. I use one signal to track the diagram data. When the diagram is edited, the signal is updated, and when the signal is updated (e.g. loading a diagram), the editor is updated. I am looking for an elegant solution that doesn't 'boomerang' after every update (e.g. the signal updates after an edit, but this looks similar to loading a new diagram, and hence the editor is updated twice for every edit). Ideally there should be a signal with an 'upstream' and a 'downstream' get/set. When the upstream sets, the downstream is set automatically, but the upstream is not set again. Likewise, if the downstream sets, the upstream sets. The two are always in sync, but either 'side' can take the lead by dictating a new value.

Is there a way to implement something like this in Solid?