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node_modules/recharts/es6/util/useAnimationId.js

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+import { useRef } from 'react';
+import { uniqueId } from './DataUtils';
+
+/**
+ * This hook returns a unique animation id for the object input.
+ * If input changes (as in, reference equality is different), the animation id will change.
+ * If input does not change, the animation id will not change.
+ *
+ * This is useful for animations. The Animate component
+ * does have a `shouldReAnimate` prop but that doesn't seem to be doing what the name implies.
+ * Also, we don't always want to re-animate on every render;
+ * we only want to re-animate when the input changes. Not the internal state (e.g. `isAnimating`).
+ *
+ * @param input The object to check for changes. Uses reference equality (=== operator)
+ * @param prefix Optional prefix to use for the animation id
+ * @returns A unique animation id
+ */
+export function useAnimationId(input) {
+  var prefix = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 'animation-';
+  var animationId = useRef(uniqueId(prefix));
+  var prevProps = useRef(input);
+  if (prevProps.current !== input) {
+    animationId.current = uniqueId(prefix);
+    prevProps.current = input;
+  }
+  return animationId.current;
+}