How to use the simple-react-form.Form.defaultProps function in simple-react-form

<div style="{{">{this.props.errorMessage}</div>
        <div>
          {this.renderChildren()}
        </div>
        <div style="{{">
          {this.renderAddButton()}
        </div>
      
    );
  }
}

MaterialArray.propTypes = propTypes;
MaterialArray.defaultProps = defaultProps;

Form.defaultProps.arrayComponent = MaterialArray;

//ArrayComponent = MaterialArray;

};

export default class MaterialObject extends ObjectComponent {
  render() {
    return (
      
        <div style="{styles.label}">{this.getLabel()}</div>
        <div style="{{">{this.props.errorMessage}</div>
        {this.renderChildren(this.props.children)}
      
    );
  }
}

//MRF.Object = MaterialObject;
Form.defaultProps.objectComponent = MaterialObject;

//ObjectComponent = MaterialObject;