Problem with client-side js function

plotly.js
4

Try something like this from this topic (the newFig line)

app.clientside_callback(
    """
    function(drop_val, fig, init_val) {
        newFig = JSON.parse(JSON.stringify(fig))
        if (drop_val == 1.0) {
            newFig['data'][0]['z'] = init_val
        } else {
            newFig['data'][0]['z'] = init_val.map(element => element * drop_val)
        }
        return newFig
    }
    """,
    Output('graph', 'figure'),
    Input('drop', 'value'),
    State('graph', 'figure'),
    State('store', 'data'),
    prevent_initial_call=True
)