First commit.

Signed-off-by: Chen Xiao <abigwc@gmail.com>

client/node_modules/d3-transition/src/active.js

@@ -0,0 +1,21 @@
+import {Transition} from "./transition/index.js";
+import {SCHEDULED} from "./transition/schedule.js";
+
+var root = [null];
+
+export default function(node, name) {
+  var schedules = node.__transition,
+      schedule,
+      i;
+
+  if (schedules) {
+    name = name == null ? null : name + "";
+    for (i in schedules) {
+      if ((schedule = schedules[i]).state > SCHEDULED && schedule.name === name) {
+        return new Transition([[node]], root, name, +i);
+      }
+    }
+  }
+
+  return null;
+}