How to restrict the node to single input about drawflow HOT 9 CLOSED

editor.on("connectionCreated", function(info) {
  const nodeInfo = editor.getNodeFromId(info.input_id);
  if(nodeInfo.inputs[info.input_class].connections.length > 1) {
    const removeConnectionInfo = nodeInfo.inputs[info.input_class].connections[0];
    editor.removeSingleConnection(removeConnectionInfo.node, info.input_id, removeConnectionInfo.input, info.input_class);
  }
});

editor.on("connectionCreated", function(info) {
  const nodeInfo = editor.getNodeFromId(info.output_id);
  if(nodeInfo.outputs[info.output_class].connections.length > 1) {
    const removeConnectionInfo = nodeInfo.outputs[info.output_class].connections[0];
    editor.removeSingleConnection(info.output_id, removeConnectionInfo.node, info.output_class, removeConnectionInfo.output);
  }
});

let deleteConnectionAuto = false;

editor.on("connectionCreated", function(info) {
  const nodeInfo = editor.getNodeFromId(info.output_id);
  if(nodeInfo.outputs[info.output_class].connections.length > 1) {
    const removeConnectionInfo = nodeInfo.outputs[info.output_class].connections[0];
    deleteConnectionAuto = true;
    editor.removeSingleConnection(info.output_id, removeConnectionInfo.node, info.output_class, removeConnectionInfo.output);
  }
});

this.editor.on('connectionRemoved', (info) => { 
    if(!deleteConnectionAuto) {
        // call delete api
    } else {
        deleteConnectionAuto = false;
    }
})