Connection
The Connection type is the basic minimal description of an Edge
between two nodes. The addEdge util can be used to upgrade
a Connection to an Edge.
export type Connection = {
  source: string;
  target: string;
  sourceHandle: string | null;
  targetHandle: string | null;
};Fields
| Name | Type | 
|---|---|
# source | stringThe id of the node this connection originates from.  | 
# target | stringThe id of the node this connection terminates at.  | 
# sourceHandle | string | nullWhen not null, the id of the handle on the source node that
      this connection originates from.  | 
# targetHandle | string | nullWhen not null, the id of the handle on the target node that
      this connection terminates at.  |