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+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @providesModule flattenArray
+ * @typechecks
+ * @flow
+ */
+
+/**
+ * Returns a flattened array that represents the DFS traversal of the supplied
+ * input array. For example:
+ *
+ * var deep = ["a", ["b", "c"], "d", {"e": [1, 2]}, [["f"], "g"]];
+ * var flat = flattenArray(deep);
+ * console.log(flat);
+ * > ["a", "b", "c", "d", {"e": [1, 2]}, "f", "g"];
+ *
+ * @see https://github.com/jonschlinkert/arr-flatten
+ * @copyright 2014-2015 Jon Schlinkert
+ * @license MIT
+ */
+function flattenArray(array: Array<any>): Array<any> {
+ const result = [];
+ flatten(array, result);
+ return result;
+}
+
+function flatten(array: Array<any>, result: Array<any>): void {
+ let length = array.length;
+ let ii = 0;
+
+ while (length--) {
+ const current = array[ii++];
+ if (Array.isArray(current)) {
+ flatten(current, result);
+ } else {
+ result.push(current);
+ }
+ }
+}
+
+module.exports = flattenArray; \ No newline at end of file