@react-navigation/bottom-tabs/lib/module/utils/useAnimatedHashMap.js

Bottom tab navigator following iOS design guidelines

"use strict";

import * as React from 'react';
import { Animated } from 'react-native';
export function useAnimatedHashMap({
  routes,
  index
}) {
  const refs = React.useRef({});
  const previous = refs.current;
  const routeKeys = Object.keys(previous);
  if (routes.length === routeKeys.length && routes.every(route => routeKeys.includes(route.key))) {
    return previous;
  }
  refs.current = {};
  routes.forEach(({
    key
  }, i) => {
    refs.current[key] = previous[key] ?? new Animated.Value(i === index ? 0 : i >= index ? 1 : -1);
  });
  return refs.current;
}
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