flow like the river

BACK_BACK/node_modules/d3-ease/src/exp.js

@@ -0,0 +1,13 @@
+import {tpmt} from "./math.js";
+
+export function expIn(t) {
+  return tpmt(1 - +t);
+}
+
+export function expOut(t) {
+  return 1 - tpmt(t);
+}
+
+export function expInOut(t) {
+  return ((t *= 2) <= 1 ? tpmt(1 - t) : 2 - tpmt(t - 1)) / 2;
+}