How to use the @nivo/geo.GeoMapDefaultProps.borderWidth function in @nivo/geo

key: 'unknownColor',
        scopes: ['Choropleth', 'ChoroplethCanvas'],
        description: 'Defines the color to use for features without value.',
        type: '{string}',
        required: false,
        default: 'nivo',
        controlType: 'colorPicker',
        controlGroup: 'Style',
    },
    {
        key: 'borderWidth',
        scopes: '*',
        description: 'Control border width.',
        type: '{number}',
        required: false,
        default: GeoMapDefaultProps.borderWidth,
        controlType: 'range',
        controlGroup: 'Style',
        controlOptions: {
            unit: 'px',
            min: 0,
            max: 10,
            step: 0.5,
        },
    },
    {
        key: 'borderColor',
        scopes: '*',
        description: 'Method to compute border color.',
        type: '{string|Function}',
        required: false,
        default: GeoMapDefaultProps.borderColor,

max: 360,
                },
                {
                    label: 'gamma (γ)',
                    min: -360,
                    max: 360,
                },
            ],
        },
    },
    {
        key: 'borderWidth',
        help: 'Control border width.',
        type: 'number',
        required: false,
        defaultValue: GeoMapDefaultProps.borderWidth,
        controlType: 'lineWidth',
        group: 'Style',
        controlOptions: {
            step: 0.5,
        },
    },
    {
        key: 'borderColor',
        help: 'Method to compute border color.',
        type: 'string | object | Function',
        required: false,
        defaultValue: GeoMapDefaultProps.borderColor,
        controlType: 'inheritedColor',
        group: 'Style',
    },
    {