Add existing to tracked

node_modules/topojson-client/src/transform.js

@@ -0,0 +1,19 @@
+import identity from "./identity.js";
+
+export default function(transform) {
+  if (transform == null) return identity;
+  var x0,
+      y0,
+      kx = transform.scale[0],
+      ky = transform.scale[1],
+      dx = transform.translate[0],
+      dy = transform.translate[1];
+  return function(input, i) {
+    if (!i) x0 = y0 = 0;
+    var j = 2, n = input.length, output = new Array(n);
+    output[0] = (x0 += input[0]) * kx + dx;
+    output[1] = (y0 += input[1]) * ky + dy;
+    while (j < n) output[j] = input[j], ++j;
+    return output;
+  };
+}