Izmjenjena struktura, dodan backand

web/node_modules/pretty-format/build/plugins/ImmutableStack.js

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+'use strict';
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+const printImmutable = require('./lib/printImmutable'); /**
+                                                         * Copyright (c) 2014-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.
+                                                         *
+                                                         * 
+                                                         */const IS_STACK = '@@__IMMUTABLE_STACK__@@';const test = maybeStack => !!(maybeStack && maybeStack[IS_STACK]);const print = (val, print, indent,
+opts,
+colors) =>
+printImmutable(val, print, indent, opts, colors, 'Stack', false);
+
+module.exports = { print, test };