Index: node_modules/d3-timer/src/interval.js
===================================================================
--- node_modules/d3-timer/src/interval.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-timer/src/interval.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,17 @@
+import {Timer, now} from "./timer.js";
+
+export default function(callback, delay, time) {
+  var t = new Timer, total = delay;
+  if (delay == null) return t.restart(callback, delay, time), t;
+  t._restart = t.restart;
+  t.restart = function(callback, delay, time) {
+    delay = +delay, time = time == null ? now() : +time;
+    t._restart(function tick(elapsed) {
+      elapsed += total;
+      t._restart(tick, total += delay, time);
+      callback(elapsed);
+    }, delay, time);
+  }
+  t.restart(callback, delay, time);
+  return t;
+}