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HTML 

              
                <html lang="en">

<head>
  <meta charset="utf-8" />
  <meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
  <!--
     ArcGIS Maps SDK for JavaScript, https://js.arcgis.com
     For more information about the draw-line sample,
     read the original sample description at developers.arcgis.com.
     https://developers.arcgis.com/javascript/latest/sample-code/draw-line/
     -->
  <title>Draw polyline | Sample | ArcGIS Maps SDK for JavaScript 4.28</title>

  <link rel="stylesheet" href="https://js.arcgis.com/4.28/esri/themes/light/main.css" />
  <script src="https://js.arcgis.com/4.28/"></script>

  <style>
    html,
    body,
    #viewDiv {
      height: 100%;
      width: 100%;
      margin: 0;
      padding: 0;
    }
  </style>
  <script>
    require([
      "esri/Map",
      "esri/views/MapView",
      "esri/views/draw/Draw",
      "esri/Graphic",
      "esri/geometry/geometryEngine"
    ], (Map, MapView, Draw, Graphic, geometryEngine) => {
      const map = new Map({
        basemap: "gray-vector"
      });
      const view = new MapView({
        container: "viewDiv",
        map: map,
        zoom: 15,
        center: [18.06, 59.34]
      });
      // add the button for the draw tool
      view.ui.add("line-button", "top-left");
      const draw = new Draw({
        view: view
      });
      // draw polyline button
      document.getElementById("line-button").onclick = () => {
        view.graphics.removeAll();
        // creates and returns an instance of PolyLineDrawAction
        const action = draw.create("polyline");
        // focus the view to activate keyboard shortcuts for sketching
        view.focus();
        // listen polylineDrawAction events to give immediate visual feedback
        // to users as the line is being drawn on the view.
        action.on(
          [
            "vertex-add",
            "vertex-remove",
            "cursor-update",
            "redo",
            "undo",
            "draw-complete"
          ],
          updateVertices
        );
      };
      // Checks if the last vertex is making the line intersect itself.
      function updateVertices(event) {
        // create a polyline from returned vertices
        if (event.vertices.length > 1) {
          const result = createGraphic(event);
          // if the last vertex is making the line intersects itself,
          // prevent the events from firing
          if (result.selfIntersects) {
            event.preventDefault();
          }
        }
      }
      // create a new graphic presenting the polyline that is being drawn on the view
      function createGraphic(event) {
        const vertices = event.vertices;
        view.graphics.removeAll();
        // a graphic representing the polyline that is being drawn
        const graphic = new Graphic({
          geometry: {
            type: "polyline",
            paths: vertices,
            spatialReference: view.spatialReference
          },
          symbol: {
            type: "cim",
            data: {
              type: "CIMSymbolReference",
              symbol: {
                type: "CIMLineSymbol",
                symbolLayers: [{
                    type: "CIMSolidStroke",
                    enable: "true",
                    effects: [{
                      type: "CIMGeometricEffectBuffer",
                      size: 3
                    }],
                    capStyle: "Butt",
                    joinStyle: "Round",
                    width: 1,
                    color: [0, 0, 0, 255]
                  },
                  {
                    type: "CIMSolidStroke",
                    enable: true,
                    capStyle: "Butt",
                    joinStyle: "Bevel",
                    width: 6,
                    color: [255, 50, 255, 255]
                  }
                ]
              }
            }
          }
        });
        // check if the polyline intersects itself.
        const intersectingSegment = getIntersectingSegment(graphic.geometry);
        // Add a new graphic for the intersecting segment.
        if (intersectingSegment) {
          view.graphics.addMany([graphic, intersectingSegment]);
        }
        // Just add the graphic representing the polyline if no intersection
        else {
          view.graphics.add(graphic);
        }
        // return intersectingSegment
        return {
          selfIntersects: intersectingSegment
        };
      }
      // function that checks if the line intersects itself
      function isSelfIntersecting(polyline) {
        if (polyline.paths[0].length < 3) {
          return false;
        }
        const line = polyline.clone();
        //get the last segment from the polyline that is being drawn
        const lastSegment = getLastSegment(polyline);
        line.removePoint(0, line.paths[0].length - 1);
        // returns true if the line intersects itself, false otherwise
        return geometryEngine.crosses(lastSegment, line);
      }
      // Checks if the line intersects itself. If yes, change the last
      // segment's symbol giving a visual feedback to the user.
      function getIntersectingSegment(polyline) {
        if (isSelfIntersecting(polyline)) {
          return new Graphic({
            geometry: getLastSegment(polyline),
            symbol: {
              type: "simple-line", // autocasts as new SimpleLineSymbol
              style: "short-dot",
              width: 3.5,
              color: "yellow"
            }
          });
        }
        return null;
      }
      // Get the last segment of the polyline that is being drawn
      function getLastSegment(polyline) {
        const line = polyline.clone();
        const lastXYPoint = line.removePoint(0, line.paths[0].length - 1);
        const existingLineFinalPoint = line.getPoint(
          0,
          line.paths[0].length - 1
        );
        return {
          type: "polyline",
          spatialReference: view.spatialReference,
          hasZ: false,
          paths: [
            [
              [existingLineFinalPoint.x, existingLineFinalPoint.y],
              [lastXYPoint.x, lastXYPoint.y]
            ]
          ]
        };
      }
    });
  </script>
</head>

<body>
  <div id="viewDiv">
    <div id="line-button" class="esri-widget esri-widget--button esri-interactive" title="Draw polyline">
      <span class="esri-icon-polyline"></span>
    </div>
  </div>
</body>

</html>
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