The given example showcases a technique to enhance UX by enlarging the connection dropping area. This means that users do not have to aim directly at the socket to make a connection, particularly when the socket is small or the zoom level is low.
In order to implement this strategy in your project, just copy the magnetic-connection directory and the corresponding useMagneticConnection function call in the editor.ts module. Depending on the rendering plugin you are using, you can either use the existing component from the directory or create your own.