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

choices: stackOrderPropKeys.map(key => ({
                label: key,
                value: key,
            })),
        },
    },
    {
        key: 'curve',
        description: `
            Defines the curve factory to use
            for the area generator.
        `,
        help: 'Curve interpolation.',
        type: 'string',
        required: false,
        defaultValue: defaults.curve,
        controlType: 'choices',
        group: 'Base',
        controlOptions: {
            choices: areaCurvePropKeys.map(key => ({
                label: key,
                value: key,
            })),
        },
    },
    {
        key: 'width',
        enableControlForFlavors: ['api'],
        description: `
            not required if using
            \`\`.
        `,