Index: node_modules/d3-geo/src/path/string.js
===================================================================
--- node_modules/d3-geo/src/path/string.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-geo/src/path/string.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,86 @@
+// Simple caching for constant-radius points.
+let cacheDigits, cacheAppend, cacheRadius, cacheCircle;
+
+export default class PathString {
+  constructor(digits) {
+    this._append = digits == null ? append : appendRound(digits);
+    this._radius = 4.5;
+    this._ = "";
+  }
+  pointRadius(_) {
+    this._radius = +_;
+    return this;
+  }
+  polygonStart() {
+    this._line = 0;
+  }
+  polygonEnd() {
+    this._line = NaN;
+  }
+  lineStart() {
+    this._point = 0;
+  }
+  lineEnd() {
+    if (this._line === 0) this._ += "Z";
+    this._point = NaN;
+  }
+  point(x, y) {
+    switch (this._point) {
+      case 0: {
+        this._append`M${x},${y}`;
+        this._point = 1;
+        break;
+      }
+      case 1: {
+        this._append`L${x},${y}`;
+        break;
+      }
+      default: {
+        this._append`M${x},${y}`;
+        if (this._radius !== cacheRadius || this._append !== cacheAppend) {
+          const r = this._radius;
+          const s = this._;
+          this._ = ""; // stash the old string so we can cache the circle path fragment
+          this._append`m0,${r}a${r},${r} 0 1,1 0,${-2 * r}a${r},${r} 0 1,1 0,${2 * r}z`;
+          cacheRadius = r;
+          cacheAppend = this._append;
+          cacheCircle = this._;
+          this._ = s;
+        }
+        this._ += cacheCircle;
+        break;
+      }
+    }
+  }
+  result() {
+    const result = this._;
+    this._ = "";
+    return result.length ? result : null;
+  }
+}
+
+function append(strings) {
+  let i = 1;
+  this._ += strings[0];
+  for (const j = strings.length; i < j; ++i) {
+    this._ += arguments[i] + strings[i];
+  }
+}
+
+function appendRound(digits) {
+  const d = Math.floor(digits);
+  if (!(d >= 0)) throw new RangeError(`invalid digits: ${digits}`);
+  if (d > 15) return append;
+  if (d !== cacheDigits) {
+    const k = 10 ** d;
+    cacheDigits = d;
+    cacheAppend = function append(strings) {
+      let i = 1;
+      this._ += strings[0];
+      for (const j = strings.length; i < j; ++i) {
+        this._ += Math.round(arguments[i] * k) / k + strings[i];
+      }
+    };
+  }
+  return cacheAppend;
+}