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# babel-traverse
> babel-traverse maintains the overall tree state, and is responsible for replacing, removing, and adding nodes.
## Install
```sh
$ npm install --save babel-traverse
```
## Usage
We can use it alongside Babylon to traverse and update nodes:
```js
import * as babylon from "babylon";
import traverse from "babel-traverse";
const code = `function square(n) {
return n * n;
}`;
const ast = babylon.parse(code);
traverse(ast, {
enter(path) {
if (path.isIdentifier({ name: "n" })) {
path.node.name = "x";
}
}
});
```
[:book: **Read the full docs here**](https://github.com/thejameskyle/babel-handbook/blob/master/translations/en/plugin-handbook.md#babel-traverse)
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