Index: node_modules/d3-random/src/gamma.js
===================================================================
--- node_modules/d3-random/src/gamma.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-random/src/gamma.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,34 @@
+import defaultSource from "./defaultSource.js";
+import normal from "./normal.js";
+
+export default (function sourceRandomGamma(source) {
+  var randomNormal = normal.source(source)();
+
+  function randomGamma(k, theta) {
+    if ((k = +k) < 0) throw new RangeError("invalid k");
+    // degenerate distribution if k === 0
+    if (k === 0) return () => 0;
+    theta = theta == null ? 1 : +theta;
+    // exponential distribution if k === 1
+    if (k === 1) return () => -Math.log1p(-source()) * theta;
+
+    var d = (k < 1 ? k + 1 : k) - 1 / 3,
+        c = 1 / (3 * Math.sqrt(d)),
+        multiplier = k < 1 ? () => Math.pow(source(), 1 / k) : () => 1;
+    return function() {
+      do {
+        do {
+          var x = randomNormal(),
+              v = 1 + c * x;
+        } while (v <= 0);
+        v *= v * v;
+        var u = 1 - source();
+      } while (u >= 1 - 0.0331 * x * x * x * x && Math.log(u) >= 0.5 * x * x + d * (1 - v + Math.log(v)));
+      return d * v * multiplier() * theta;
+    };
+  }
+
+  randomGamma.source = sourceRandomGamma;
+
+  return randomGamma;
+})(defaultSource);