How to use the fusioncharts/themes/fusioncharts.theme.fusion function in fusioncharts

import React from 'react';
import FusionCharts from 'fusioncharts';
import Charts from 'fusioncharts/fusioncharts.charts';
import FusionTheme from 'fusioncharts/themes/fusioncharts.theme.fusion';
import ReactFC from '../lib/ReactFC';
import PropTypes from 'prop-types';

Charts(FusionCharts);
FusionTheme(FusionCharts);

class DrillDown extends React.Component {
  constructor(props) {
    super(props);

    this.state = {
      showOverlaybtn: true,
      // Absolute position of Overlay Button
      positionH: (this.props.defaultOverlayBtnSettings && this.props.defaultOverlayBtnSettings.placement && this.props.defaultOverlayBtnSettings.placement.includes('-')) ? this.props.defaultOverlayBtnSettings.placement.split('-')[1] : 'right',
      positionV: (this.props.defaultOverlayBtnSettings && this.props.defaultOverlayBtnSettings.placement && this.props.defaultOverlayBtnSettings.placement.includes('-')) ? this.props.defaultOverlayBtnSettings.placement.split('-')[0] : 'top',
      selectedChild: 0,
      showDrillDown: false,
      // Parent Chart's Data Source
      dataSource: this.props.dataSource,
      // An array of indices which maps each 
      // data plot of parent with its nested Chart Component.