Index: node_modules/d3-ease/src/circle.js
===================================================================
--- node_modules/d3-ease/src/circle.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-ease/src/circle.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,11 @@
+export function circleIn(t) {
+  return 1 - Math.sqrt(1 - t * t);
+}
+
+export function circleOut(t) {
+  return Math.sqrt(1 - --t * t);
+}
+
+export function circleInOut(t) {
+  return ((t *= 2) <= 1 ? 1 - Math.sqrt(1 - t * t) : Math.sqrt(1 - (t -= 2) * t) + 1) / 2;
+}