Index: node_modules/recharts/es6/util/getChartPointer.js
===================================================================
--- node_modules/recharts/es6/util/getChartPointer.js	(revision a762898ecd37a452c782821d4c2c4955c6ed2521)
+++ node_modules/recharts/es6/util/getChartPointer.js	(revision a762898ecd37a452c782821d4c2c4955c6ed2521)
@@ -0,0 +1,32 @@
+/**
+ * Computes the chart coordinates from the mouse event.
+ *
+ * The coordinates are relative to the top-left corner of the chart,
+ * where the top-left corner of the chart is (0, 0).
+ * Moving right, the x-coordinate increases, and moving down, the y-coordinate increases.
+ *
+ * The coordinates are rounded to the nearest integer and are including a CSS transform scale.
+ * So a chart that's scaled will return the same coordinates as a chart that's not scaled.
+ *
+ * @param event The mouse event from React event handlers
+ * @return chartPointer The chart coordinates relative to the top-left corner of the chart
+ */
+export var getChartPointer = event => {
+  var rect = event.currentTarget.getBoundingClientRect();
+  var scaleX = rect.width / event.currentTarget.offsetWidth;
+  var scaleY = rect.height / event.currentTarget.offsetHeight;
+  return {
+    /*
+     * Here it's important to use:
+     * - event.clientX and event.clientY to get the mouse position relative to the viewport, including scroll.
+     * - pageX and pageY are not used because they are relative to the whole document, and ignore scroll.
+     * - rect.left and rect.top are used to get the position of the chart relative to the viewport.
+     * - offsetX and offsetY are not used because they are relative to the offset parent
+     *  which may or may not be the same as the clientX and clientY, depending on the position of the chart in the DOM
+     *  and surrounding element styles. CSS position: relative, absolute, fixed, will change the offset parent.
+     * - scaleX and scaleY are necessary for when the chart element is scaled using CSS `transform: scale(N)`.
+     */
+    chartX: Math.round((event.clientX - rect.left) / scaleX),
+    chartY: Math.round((event.clientY - rect.top) / scaleY)
+  };
+};