Viewing github.com/facebook/react/packages/react-server/src/ReactFizzComponentStack.js

```
/**
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 * Copyright (c) Meta Platforms, Inc. and affiliates.

```
 *
```

 * This source code is licensed under the MIT license found in the

 * LICENSE file in the root directory of this source tree.

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 *
```
```
 * @flow
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```
 */
```
```
import {
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  describeBuiltInComponentFrame,
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  describeFunctionComponentFrame,
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  describeClassComponentFrame,
```

} from 'shared/ReactComponentStackFrame';

// DEV-only reverse linked list representing the current component stack

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type BuiltInComponentStackNode = {
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  tag: 0,
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  parent: null | ComponentStackNode,
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  type: string,
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};
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type FunctionComponentStackNode = {
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  tag: 1,
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  parent: null | ComponentStackNode,
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  type: Function,
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};
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type ClassComponentStackNode = {
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  tag: 2,
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  parent: null | ComponentStackNode,
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  type: Function,
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};
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export type ComponentStackNode =
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  | BuiltInComponentStackNode
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  | FunctionComponentStackNode
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  | ClassComponentStackNode;
```

export function getStackByComponentStackNode(

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  componentStack: ComponentStackNode,
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): string {
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  try {
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    let info = '';
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    let node: ComponentStackNode = componentStack;

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    do {
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      switch (node.tag) {
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        case 0:
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          info += describeBuiltInComponentFrame(node.type, null, null);

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          break;
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        case 1:
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          info += describeFunctionComponentFrame(node.type, null, null);

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          break;
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        case 2:
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          info += describeClassComponentFrame(node.type, null, null);

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          break;
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      }
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      // $FlowFixMe[incompatible-type] we bail out when we get a null

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      node = node.parent;
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    } while (node);
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    return info;
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  } catch (x) {
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    return '\nError generating stack: ' + x.message + '\n' + x.stack;

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  }
```
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}
```

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