Index: node_modules/d3-time/src/millisecond.js
===================================================================
--- node_modules/d3-time/src/millisecond.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-time/src/millisecond.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,25 @@
+import {timeInterval} from "./interval.js";
+
+export const millisecond = timeInterval(() => {
+  // noop
+}, (date, step) => {
+  date.setTime(+date + step);
+}, (start, end) => {
+  return end - start;
+});
+
+// An optimized implementation for this simple case.
+millisecond.every = (k) => {
+  k = Math.floor(k);
+  if (!isFinite(k) || !(k > 0)) return null;
+  if (!(k > 1)) return millisecond;
+  return timeInterval((date) => {
+    date.setTime(Math.floor(date / k) * k);
+  }, (date, step) => {
+    date.setTime(+date + step * k);
+  }, (start, end) => {
+    return (end - start) / k;
+  });
+};
+
+export const milliseconds = millisecond.range;