Index: node_modules/d3-time/src/interval.js
===================================================================
--- node_modules/d3-time/src/interval.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-time/src/interval.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,69 @@
+const t0 = new Date, t1 = new Date;
+
+export function timeInterval(floori, offseti, count, field) {
+
+  function interval(date) {
+    return floori(date = arguments.length === 0 ? new Date : new Date(+date)), date;
+  }
+
+  interval.floor = (date) => {
+    return floori(date = new Date(+date)), date;
+  };
+
+  interval.ceil = (date) => {
+    return floori(date = new Date(date - 1)), offseti(date, 1), floori(date), date;
+  };
+
+  interval.round = (date) => {
+    const d0 = interval(date), d1 = interval.ceil(date);
+    return date - d0 < d1 - date ? d0 : d1;
+  };
+
+  interval.offset = (date, step) => {
+    return offseti(date = new Date(+date), step == null ? 1 : Math.floor(step)), date;
+  };
+
+  interval.range = (start, stop, step) => {
+    const range = [];
+    start = interval.ceil(start);
+    step = step == null ? 1 : Math.floor(step);
+    if (!(start < stop) || !(step > 0)) return range; // also handles Invalid Date
+    let previous;
+    do range.push(previous = new Date(+start)), offseti(start, step), floori(start);
+    while (previous < start && start < stop);
+    return range;
+  };
+
+  interval.filter = (test) => {
+    return timeInterval((date) => {
+      if (date >= date) while (floori(date), !test(date)) date.setTime(date - 1);
+    }, (date, step) => {
+      if (date >= date) {
+        if (step < 0) while (++step <= 0) {
+          while (offseti(date, -1), !test(date)) {} // eslint-disable-line no-empty
+        } else while (--step >= 0) {
+          while (offseti(date, +1), !test(date)) {} // eslint-disable-line no-empty
+        }
+      }
+    });
+  };
+
+  if (count) {
+    interval.count = (start, end) => {
+      t0.setTime(+start), t1.setTime(+end);
+      floori(t0), floori(t1);
+      return Math.floor(count(t0, t1));
+    };
+
+    interval.every = (step) => {
+      step = Math.floor(step);
+      return !isFinite(step) || !(step > 0) ? null
+          : !(step > 1) ? interval
+          : interval.filter(field
+              ? (d) => field(d) % step === 0
+              : (d) => interval.count(0, d) % step === 0);
+    };
+  }
+
+  return interval;
+}