How to use the @nivo/stream.StreamDefaultProps.borderColor function in @nivo/stream

type: 'number',
        required: false,
        defaultValue: defaults.borderWidth,
        controlType: 'lineWidth',
        group: 'Style',
    },
    {
        key: 'borderColor',
        description: `
            How to compute border color,
            [see dedicated documentation](self:/guides/colors).
        `,
        help: 'Method to compute layer border color.',
        type: 'string | object | Function',
        required: false,
        defaultValue: defaults.borderColor,
        controlType: 'inheritedColor',
        group: 'Style',
    },
    ...defsProperties('Style'),
    {
        key: 'enableGridX',
        help: 'Enable/disable x grid.',
        type: 'boolean',
        required: false,
        defaultValue: defaults.enableGridX,
        controlType: 'switch',
        group: 'Grid & Axes',
    },
    {
        key: 'enableGridY',
        help: 'Enable/disable y grid.',