polish

src/navigation/tabTransition.ts

@@ -0,0 +1,20 @@
+/**
+ * Bottom tabs use React Native's legacy native Animated driver. On Android,
+ * timing animations are pre-sampled at 60 fps, so their positions repeat on a
+ * 120 Hz display. A critically damped native spring is evaluated from each
+ * display frame instead while preserving the current ~160 ms ease-out feel.
+ */
+export const TAB_TRANSITION_SETTLE_MS = 160;
+
+export const TAB_TRANSITION_SPEC = {
+  animation: 'spring',
+  config: {
+    stiffness: 2500,
+    damping: 100,
+    mass: 1,
+    overshootClamping: true,
+    restDisplacementThreshold: 0.004,
+    restSpeedThreshold: 0.15,
+  },
+} as const;
+