code: function eliminateHole (data, holeNode, outerNode) {
    outerNode = findHoleBridge(data, holeNode, outerNode)
    if (outerNode) {
      var b = splitPolygon(outerNode, holeNode)
      filterPoints(data, b, b.next)
    }
  }
docs: find a bridge between vertices that connects hole with an outer ring and and link it