diff --git a/src/mxgraph/io/mxObjectCodec.js b/src/mxgraph/io/mxObjectCodec.js
index 36be17212..a57be4d13 100644
--- a/src/mxgraph/io/mxObjectCodec.js
+++ b/src/mxgraph/io/mxObjectCodec.js
@@ -867,7 +867,7 @@ class mxObjectCodec {
       const tmp = child.nextSibling;
 
       if (
-        child.nodeType == mxConstants.NODETYPE_ELEMENT &&
+        child.nodeType === mxConstants.NODETYPE_ELEMENT &&
         !this.processInclude(dec, child, obj)
       ) {
         this.decodeChild(dec, child, obj);
diff --git a/src/mxgraph/shape/mxImageShape.js b/src/mxgraph/shape/mxImageShape.js
index 6bbdebab7..1ae837cf0 100644
--- a/src/mxgraph/shape/mxImageShape.js
+++ b/src/mxgraph/shape/mxImageShape.js
@@ -82,13 +82,13 @@ class mxImageShape extends mxRectangleShape {
 
     if (this.style != null) {
       this.preserveImageAspect =
-        mxUtils.getNumber(this.style, mxConstants.STYLE_IMAGE_ASPECT, 1) === 1;
+        mxUtils.getNumber(this.style, mxConstants.STYLE_IMAGE_ASPECT, 1) == 1;
 
       // Legacy support for imageFlipH/V
       this.flipH =
-        this.flipH || mxUtils.getValue(this.style, 'imageFlipH', 0) === 1;
+        this.flipH || mxUtils.getValue(this.style, 'imageFlipH', 0) == 1;
       this.flipV =
-        this.flipV || mxUtils.getValue(this.style, 'imageFlipV', 0) === 1;
+        this.flipV || mxUtils.getValue(this.style, 'imageFlipV', 0) == 1;
     }
   }
 
diff --git a/src/mxgraph/shape/mxPolyline.js b/src/mxgraph/shape/mxPolyline.js
index b0f396b8f..6e600490d 100644
--- a/src/mxgraph/shape/mxPolyline.js
+++ b/src/mxgraph/shape/mxPolyline.js
@@ -107,22 +107,20 @@ class mxPolyline extends mxShape {
 
     const pt = pts[0];
     const n = pts.length;
-
     c.moveTo(pt.x, pt.y);
 
     for (let i = 1; i < n - 2; i += 1) {
-      var p0 = pts[i];
-      var p1 = pts[i + 1];
+      const p0 = pts[i];
+      const p1 = pts[i + 1];
       const ix = (p0.x + p1.x) / 2;
       const iy = (p0.y + p1.y) / 2;
-
       c.quadTo(p0.x, p0.y, ix, iy);
     }
 
-    var p0 = pts[n - 2];
-    var p1 = pts[n - 1];
-
+    const p0 = pts[n - 2];
+    const p1 = pts[n - 1];
     c.quadTo(p0.x, p0.y, p1.x, p1.y);
+
     c.stroke();
   }
 }
diff --git a/src/mxgraph/shape/mxRectangleShape.js b/src/mxgraph/shape/mxRectangleShape.js
index 596f7ecd5..40b89fd35 100644
--- a/src/mxgraph/shape/mxRectangleShape.js
+++ b/src/mxgraph/shape/mxRectangleShape.js
@@ -54,8 +54,8 @@ class mxRectangleShape extends mxShape {
     return (
       !this.isRounded &&
       !this.glass &&
-      this.rotation == 0 &&
-      (events || (this.fill != null && this.fill != mxConstants.NONE))
+      this.rotation === 0 &&
+      (events || (this.fill != null && this.fill !== mxConstants.NONE))
     );
   }
 
@@ -138,7 +138,7 @@ class mxRectangleShape extends mxShape {
       this.glass &&
       !this.outline &&
       this.fill != null &&
-      this.fill != mxConstants.NONE
+      this.fill !== mxConstants.NONE
     ) {
       this.paintGlassEffect(
         c,
diff --git a/src/mxgraph/shape/mxStencil.js b/src/mxgraph/shape/mxStencil.js
index 136ef9086..eda2f19de 100644
--- a/src/mxgraph/shape/mxStencil.js
+++ b/src/mxgraph/shape/mxStencil.js
@@ -486,7 +486,7 @@ class mxStencil extends mxShape {
       let tmp = node.firstChild;
 
       while (tmp != null) {
-        if (tmp.nodeType == mxConstants.NODETYPE_ELEMENT) {
+        if (tmp.nodeType === mxConstants.NODETYPE_ELEMENT) {
           this.drawNode(canvas, shape, tmp, aspect, disableShadow, paint);
         }
 
@@ -627,7 +627,7 @@ class mxStencil extends mxShape {
           let childNode = node.firstChild;
 
           while (childNode != null) {
-            if (childNode.nodeType == mxConstants.NODETYPE_ELEMENT) {
+            if (childNode.nodeType === mxConstants.NODETYPE_ELEMENT) {
               this.drawNode(
                 canvas,
                 shape,
diff --git a/src/mxgraph/shape/mxStencilRegistry.js b/src/mxgraph/shape/mxStencilRegistry.js
index 17c4ba74b..4aee9a5aa 100644
--- a/src/mxgraph/shape/mxStencilRegistry.js
+++ b/src/mxgraph/shape/mxStencilRegistry.js
@@ -12,7 +12,7 @@
  *
  * while (shape != null)
  * {
- *    if (shape.nodeType == mxConstants.NODETYPE_ELEMENT)
+ *    if (shape.nodeType === mxConstants.NODETYPE_ELEMENT)
  *   {
  *     mxStencilRegistry.addStencil(shape.getAttribute('name'), new mxStencil(shape));
  *   }
diff --git a/src/mxgraph/shape/mxSwimlane.js b/src/mxgraph/shape/mxSwimlane.js
index 01911fefd..c1b774a05 100644
--- a/src/mxgraph/shape/mxSwimlane.js
+++ b/src/mxgraph/shape/mxSwimlane.js
@@ -258,7 +258,7 @@ class mxSwimlane extends mxShape {
         '1';
     }
 
-    if (!events && (this.fill == null || this.fill == mxConstants.NONE)) {
+    if (!events && (this.fill == null || this.fill === mxConstants.NONE)) {
       c.pointerEvents = false;
     }
 
@@ -270,11 +270,11 @@ class mxSwimlane extends mxShape {
       c.fillAndStroke();
 
       if (start < h) {
-        if (fill == mxConstants.NONE || !events) {
+        if (fill === mxConstants.NONE || !events) {
           c.pointerEvents = false;
         }
 
-        if (fill != mxConstants.NONE) {
+        if (fill !== mxConstants.NONE) {
           c.setFillColor(fill);
         }
 
@@ -284,7 +284,7 @@ class mxSwimlane extends mxShape {
         c.lineTo(w, h);
         c.lineTo(w, start);
 
-        if (fill == mxConstants.NONE) {
+        if (fill === mxConstants.NONE) {
           c.stroke();
         } else {
           c.fillAndStroke();
@@ -298,11 +298,11 @@ class mxSwimlane extends mxShape {
       c.fillAndStroke();
 
       if (start < w) {
-        if (fill == mxConstants.NONE || !events) {
+        if (fill === mxConstants.NONE || !events) {
           c.pointerEvents = false;
         }
 
-        if (fill != mxConstants.NONE) {
+        if (fill !== mxConstants.NONE) {
           c.setFillColor(fill);
         }
 
@@ -312,7 +312,7 @@ class mxSwimlane extends mxShape {
         c.lineTo(w, h);
         c.lineTo(start, h);
 
-        if (fill == mxConstants.NONE) {
+        if (fill === mxConstants.NONE) {
           c.stroke();
         } else {
           c.fillAndStroke();
@@ -321,7 +321,7 @@ class mxSwimlane extends mxShape {
     }
 
     if (swimlaneLine) {
-      this.paintDivider(c, x, y, w, h, start, fill == mxConstants.NONE);
+      this.paintDivider(c, x, y, w, h, start, fill === mxConstants.NONE);
     }
   }
 
@@ -341,7 +341,7 @@ class mxSwimlane extends mxShape {
         '1';
     }
 
-    if (!events && (this.fill == null || this.fill == mxConstants.NONE)) {
+    if (!events && (this.fill == null || this.fill === mxConstants.NONE)) {
       c.pointerEvents = false;
     }
 
@@ -355,11 +355,11 @@ class mxSwimlane extends mxShape {
       c.fillAndStroke();
 
       if (start < h) {
-        if (fill == mxConstants.NONE || !events) {
+        if (fill === mxConstants.NONE || !events) {
           c.pointerEvents = false;
         }
 
-        if (fill != mxConstants.NONE) {
+        if (fill !== mxConstants.NONE) {
           c.setFillColor(fill);
         }
 
@@ -371,7 +371,7 @@ class mxSwimlane extends mxShape {
         c.quadTo(w, h, w, h - r);
         c.lineTo(w, start);
 
-        if (fill == mxConstants.NONE) {
+        if (fill === mxConstants.NONE) {
           c.stroke();
         } else {
           c.fillAndStroke();
@@ -387,11 +387,11 @@ class mxSwimlane extends mxShape {
       c.fillAndStroke();
 
       if (start < w) {
-        if (fill == mxConstants.NONE || !events) {
+        if (fill === mxConstants.NONE || !events) {
           c.pointerEvents = false;
         }
 
-        if (fill != mxConstants.NONE) {
+        if (fill !== mxConstants.NONE) {
           c.setFillColor(fill);
         }
 
@@ -403,7 +403,7 @@ class mxSwimlane extends mxShape {
         c.quadTo(w, 0, w - r, 0);
         c.lineTo(start, 0);
 
-        if (fill == mxConstants.NONE) {
+        if (fill === mxConstants.NONE) {
           c.stroke();
         } else {
           c.fillAndStroke();
@@ -412,7 +412,7 @@ class mxSwimlane extends mxShape {
     }
 
     if (swimlaneLine) {
-      this.paintDivider(c, x, y, w, h, start, fill == mxConstants.NONE);
+      this.paintDivider(c, x, y, w, h, start, fill === mxConstants.NONE);
     }
   }
 
@@ -445,7 +445,7 @@ class mxSwimlane extends mxShape {
    * Paints the vertical or horizontal separator line between swimlanes.
    */
   paintSeparator(c, x, y, w, h, start, color) {
-    if (color != mxConstants.NONE) {
+    if (color !== mxConstants.NONE) {
       c.setStrokeColor(color);
       c.setDashed(true);
       c.begin();
diff --git a/src/mxgraph/util/mxUtils.js b/src/mxgraph/util/mxUtils.js
index d3131452e..65af2b1b1 100644
--- a/src/mxgraph/util/mxUtils.js
+++ b/src/mxgraph/util/mxUtils.js
@@ -1506,7 +1506,7 @@ const mxUtils = {
 
     if (value == null) {
       value = defaultValue;
-    } else if (value == mxConstants.NONE) {
+    } else if (value === mxConstants.NONE) {
       value = null;
     }
 
@@ -2089,10 +2089,10 @@ const mxUtils = {
 
     if (
       (flipV &&
-        (d == mxConstants.DIRECTION_SOUTH ||
-          d == mxConstants.DIRECTION_NORTH)) ||
+        (d === mxConstants.DIRECTION_SOUTH ||
+          d === mxConstants.DIRECTION_NORTH)) ||
       (flipH &&
-        (d == mxConstants.DIRECTION_EAST || d == mxConstants.DIRECTION_WEST))
+        (d === mxConstants.DIRECTION_EAST || d === mxConstants.DIRECTION_WEST))
     ) {
       const tmp = m.x;
       m.x = m.width;
@@ -2101,10 +2101,10 @@ const mxUtils = {
 
     if (
       (flipH &&
-        (d == mxConstants.DIRECTION_SOUTH ||
-          d == mxConstants.DIRECTION_NORTH)) ||
+        (d === mxConstants.DIRECTION_SOUTH ||
+          d === mxConstants.DIRECTION_NORTH)) ||
       (flipV &&
-        (d == mxConstants.DIRECTION_EAST || d == mxConstants.DIRECTION_WEST))
+        (d === mxConstants.DIRECTION_EAST || d === mxConstants.DIRECTION_WEST))
     ) {
       const tmp = m.y;
       m.y = m.height;
@@ -2113,17 +2113,17 @@ const mxUtils = {
 
     const m2 = mxRectangle.fromRectangle(m);
 
-    if (d == mxConstants.DIRECTION_SOUTH) {
+    if (d === mxConstants.DIRECTION_SOUTH) {
       m2.y = m.x;
       m2.x = m.height;
       m2.width = m.y;
       m2.height = m.width;
-    } else if (d == mxConstants.DIRECTION_WEST) {
+    } else if (d === mxConstants.DIRECTION_WEST) {
       m2.y = m.height;
       m2.x = m.width;
       m2.width = m.x;
       m2.height = m.y;
-    } else if (d == mxConstants.DIRECTION_NORTH) {
+    } else if (d === mxConstants.DIRECTION_NORTH) {
       m2.y = m.width;
       m2.x = m.y;
       m2.width = m.height;
@@ -3216,16 +3216,16 @@ const mxUtils = {
     let dy = -0.5;
 
     // Horizontal alignment
-    if (align == mxConstants.ALIGN_LEFT) {
+    if (align === mxConstants.ALIGN_LEFT) {
       dx = 0;
-    } else if (align == mxConstants.ALIGN_RIGHT) {
+    } else if (align === mxConstants.ALIGN_RIGHT) {
       dx = -1;
     }
 
     // Vertical alignment
-    if (valign == mxConstants.ALIGN_TOP) {
+    if (valign === mxConstants.ALIGN_TOP) {
       dy = 0;
-    } else if (valign == mxConstants.ALIGN_BOTTOM) {
+    } else if (valign === mxConstants.ALIGN_BOTTOM) {
       dy = -1;
     }
 
@@ -3272,11 +3272,11 @@ const mxUtils = {
 
     // Sets the font style
     if (fontStyle != null) {
-      if ((fontStyle & mxConstants.FONT_BOLD) == mxConstants.FONT_BOLD) {
+      if ((fontStyle & mxConstants.FONT_BOLD) === mxConstants.FONT_BOLD) {
         div.style.fontWeight = 'bold';
       }
 
-      if ((fontStyle & mxConstants.FONT_ITALIC) == mxConstants.FONT_ITALIC) {
+      if ((fontStyle & mxConstants.FONT_ITALIC) === mxConstants.FONT_ITALIC) {
         div.style.fontStyle = 'italic';
       }
 
@@ -3350,7 +3350,7 @@ const mxUtils = {
     const { drawPane } = view;
     const { overlayPane } = view;
 
-    if (graph.dialect == mxConstants.DIALECT_SVG) {
+    if (graph.dialect === mxConstants.DIALECT_SVG) {
       view.drawPane = document.createElementNS(mxConstants.NS_SVG, 'g');
       view.canvas.appendChild(view.drawPane);
 
diff --git a/src/mxgraph/view/mxCellRenderer.js b/src/mxgraph/view/mxCellRenderer.js
index 087266e87..02c4e4dcc 100644
--- a/src/mxgraph/view/mxCellRenderer.js
+++ b/src/mxgraph/view/mxCellRenderer.js
@@ -539,7 +539,7 @@ class mxCellRenderer {
     if (
       mxClient.IS_SVG &&
       mxClient.NO_FO &&
-      shape.dialect != mxConstants.DIALECT_SVG
+      shape.dialect !== mxConstants.DIALECT_SVG
     ) {
       shape.init(state.view.graph.container);
     } else {
diff --git a/src/mxgraph/view/mxEdgeStyle.js b/src/mxgraph/view/mxEdgeStyle.js
index 9b6f11120..21e80d91d 100644
--- a/src/mxgraph/view/mxEdgeStyle.js
+++ b/src/mxgraph/view/mxEdgeStyle.js
@@ -180,11 +180,11 @@ const mxEdgeStyle = {
       );
 
       if (
-        constraint != mxConstants.DIRECTION_MASK_NONE &&
+        constraint !== mxConstants.DIRECTION_MASK_NONE &&
         constraint !=
           mxConstants.DIRECTION_MASK_WEST + mxConstants.DIRECTION_MASK_EAST
       ) {
-        isTargetLeft = constraint == mxConstants.DIRECTION_MASK_WEST;
+        isTargetLeft = constraint === mxConstants.DIRECTION_MASK_WEST;
       }
     }
 
diff --git a/src/mxgraph/view/mxGraph.js b/src/mxgraph/view/mxGraph.js
index 3ad4f693f..2aa020e90 100644
--- a/src/mxgraph/view/mxGraph.js
+++ b/src/mxgraph/view/mxGraph.js
@@ -1638,9 +1638,9 @@ class mxGraph extends mxEventSource {
 
     if (mxClient.IS_SVG) {
       this.dialect = mxConstants.DIALECT_SVG;
-    } else if (renderHint == mxConstants.RENDERING_HINT_FASTEST) {
+    } else if (renderHint === mxConstants.RENDERING_HINT_FASTEST) {
       this.dialect = mxConstants.DIALECT_STRICTHTML;
-    } else if (renderHint == mxConstants.RENDERING_HINT_FASTER) {
+    } else if (renderHint === mxConstants.RENDERING_HINT_FASTER) {
       this.dialect = mxConstants.DIALECT_PREFERHTML;
     } // default for VML
     else {
@@ -2833,7 +2833,7 @@ class mxGraph extends mxEventSource {
           c.scrollTop += border - dy;
 
           if (old == c.scrollTop && extend) {
-            if (this.dialect == mxConstants.DIALECT_SVG) {
+            if (this.dialect === mxConstants.DIALECT_SVG) {
               const root = this.view.getDrawPane().ownerSVGElement;
               const height = this.container.scrollHeight + border - dy;
 
@@ -3140,7 +3140,7 @@ class mxGraph extends mxEventSource {
       width = Math.ceil(width);
       height = Math.ceil(height);
 
-      if (this.dialect == mxConstants.DIALECT_SVG) {
+      if (this.dialect === mxConstants.DIALECT_SVG) {
         const root = this.view.getDrawPane().ownerSVGElement;
 
         if (root != null) {
@@ -3665,7 +3665,7 @@ class mxGraph extends mxEventSource {
    *     let style = this.getCurrentCellStyle(edge);
    *     let elbow = mxUtils.getValue(style, mxConstants.STYLE_ELBOW,
    *         mxConstants.ELBOW_HORIZONTAL);
-   *     let value = (elbow == mxConstants.ELBOW_HORIZONTAL) ?
+   *     let value = (elbow === mxConstants.ELBOW_HORIZONTAL) ?
    *         mxConstants.ELBOW_VERTICAL : mxConstants.ELBOW_HORIZONTAL;
    *     this.setCellStyles(mxConstants.STYLE_ELBOW, value, [edge]);
    *   }
@@ -6888,11 +6888,11 @@ class mxGraph extends mxEventSource {
           1
         ) == 1
       ) {
-        if (direction == mxConstants.DIRECTION_NORTH) {
+        if (direction === mxConstants.DIRECTION_NORTH) {
           r1 += 270;
-        } else if (direction == mxConstants.DIRECTION_WEST) {
+        } else if (direction === mxConstants.DIRECTION_WEST) {
           r1 += 180;
-        } else if (direction == mxConstants.DIRECTION_SOUTH) {
+        } else if (direction === mxConstants.DIRECTION_SOUTH) {
           r1 += 90;
         }