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node_modules/aos/src/js/helpers/prepare.js

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+/* Clearing variables */
+
+import calculateOffset from './calculateOffset';
+
+const prepare = function ($elements, options) {
+  $elements.forEach((el, i) => {
+    el.node.classList.add('aos-init');
+    el.position = calculateOffset(el.node, options.offset);
+  });
+  return $elements;
+};
+
+export default prepare;