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node_modules/arr-flatten/index.js

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+/*!
+ * arr-flatten <https://github.com/jonschlinkert/arr-flatten>
+ *
+ * Copyright (c) 2014-2015, 2017, Jon Schlinkert.
+ * Released under the MIT License.
+ */
+
+'use strict';
+
+module.exports = function flatten(arr) {
+  return flat(arr, []);
+};
+
+function flat(arr, acc) {
+  var len = arr.length;
+  var idx = -1;
+
+  while (++idx < len) {
+    var cur = arr[idx];
+    if (Array.isArray(cur)) {
+      flat(cur, acc);
+    } else {
+      acc.push(cur);
+    }
+  }
+  return acc;
+}