How to hide an input in a node that is defined as a class ?

[Dylan190774]

I'm trying to disable/hide an input, depending on if another input is connected or not.
I'm using the class-based approach to create the node.

In the documentation I see:

    onUpdate({ operation }) {
        if (operation === "Sine") {
            return {
                inputs: {
                    input1: () => new NumberInterface("Input", 0),
                },
            };
        } else {
            return {
                inputs: {
                    input1: () => new NumberInterface("Input", 0),
                    input2: () => new NumberInterface("Input", 0),
                },
            };
        }
    },

but how do I do this with a class, since there seems no onUpdate available there?
This is my class definition:

 class BaseNode<I extends Inputs = Inputs, O extends Outputs = Outputs> extends DynamicNode<
  I,
  O
> {
  public type = 'BaseNode';
  public override get title(): string {
    return 'Base';
  }

  public inputs = {
    input1: new NumberInterface('Input 1', 1),
    input2: new NumberInterface('Input 2', 1),
  } as NodeInterfaceDefinition<I>;

  public outputs = {
    output: new NodeInterface('Output', 1),
  } as NodeInterfaceDefinition<O>;

  public constructor() {
    super();
  }
  public override load(data: unknown): void {
  }
  public override calculate: CalculateFunction<I, O> = (inputs, outputs) => {
    return {} as O;
  };
}

I'd like to achieve that for example, when there is nothing connected to input1, then input2 is hidden.

Any ideas?