migrate to vite working

src/math/lerp.ts

@@ -0,0 +1,11 @@
+export const lerp = (a: number, b: number, t: number) => {
+  return (a * t) + (b * (1 - t));
+};
+
+export const map = (
+  value: number,
+  x1: number,
+  y1: number,
+  x2: number,
+  y2: number,
+) => (value - x1) * (y2 - x2) / (y1 - x1) + x2;