How do the extensions detect a change in the code behind?
I am using d3 to edit an extension. I want to build a new extension, but I do not know what signals the code behind that a user has made a change to a setting in a side panel. For instance, if a maxValue is in the side panel, how does the code behind detect that the user changed the number?
Any tutorials or videos or answers that would show me that code would be great!