Izmjenjena struktura, dodan backand

web/node_modules/react-error-overlay/lib/utils/getLinesAround.js

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+/**
+ * Copyright (c) 2015-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.
+ */
+
+import { ScriptLine } from './stack-frame';
+
+/**
+ *
+ * @param {number} line The line number to provide context around.
+ * @param {number} count The number of lines you'd like for context.
+ * @param {string[] | string} lines The source code.
+ */
+function getLinesAround(line, count, lines) {
+  if (typeof lines === 'string') {
+    lines = lines.split('\n');
+  }
+  var result = [];
+  for (var index = Math.max(0, line - 1 - count); index <= Math.min(lines.length - 1, line - 1 + count); ++index) {
+    result.push(new ScriptLine(index + 1, lines[index], index === line - 1));
+  }
+  return result;
+}
+
+export { getLinesAround };
+export default getLinesAround;