Index: node_modules/d3-shape/src/symbol/diamond.js
===================================================================
--- node_modules/d3-shape/src/symbol/diamond.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-shape/src/symbol/diamond.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,16 @@
+import {sqrt} from "../math.js";
+
+const tan30 = sqrt(1 / 3);
+const tan30_2 = tan30 * 2;
+
+export default {
+  draw(context, size) {
+    const y = sqrt(size / tan30_2);
+    const x = y * tan30;
+    context.moveTo(0, -y);
+    context.lineTo(x, 0);
+    context.lineTo(0, y);
+    context.lineTo(-x, 0);
+    context.closePath();
+  }
+};