Assuming that instance = greuler(options).update() is called there are two ways to interact with the graph

instance.graph holds utility methods to manipulate the graph like adding/removing nodes and edges and other utility methods like querying the adjacent nodes of some node, etc.

The convention I used for the project is to always use objects as the first parameter to describe a node or edge (an array/function is needed in some cases of some methods of instance.graph but they describe multiple nodes/edges), also all the methods of instance.graph (but the ones who add nodes and edges) receive a single parameter

Please take a look at all the methods of instance.graph which can be found here

instance.selector holds utility methods to animate existing nodes/edges of the graph, under the hood it uses instance.graph and wraps the returning values inside d3 selections Just like instance.graph the first method will always be an object describing a node / edge, the second parameter is an override of the styles predefined to be used during the animation