code: function wrapText(text, legendWidth) {
              let fontSize = externalRadius / 5;
  
              textHelper.wrapText.call(null, 0, fontSize, legendWidth, text.node());
          }
docs: Utility function that wraps a text into the given width
  
  @param  {D3Selection} text         Text to write
  @param  {Number} legendWidth Width of the container
  @private