Index: node_modules/d3-polygon/src/contains.js
===================================================================
--- node_modules/d3-polygon/src/contains.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-polygon/src/contains.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,16 @@
+export default function(polygon, point) {
+  var n = polygon.length,
+      p = polygon[n - 1],
+      x = point[0], y = point[1],
+      x0 = p[0], y0 = p[1],
+      x1, y1,
+      inside = false;
+
+  for (var i = 0; i < n; ++i) {
+    p = polygon[i], x1 = p[0], y1 = p[1];
+    if (((y1 > y) !== (y0 > y)) && (x < (x0 - x1) * (y - y1) / (y0 - y1) + x1)) inside = !inside;
+    x0 = x1, y0 = y1;
+  }
+
+  return inside;
+}