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# @babel/helper-annotate-as-pure
## API
```js
declare export default annotateAsPure(nodeOrPath: Node | NodePath);
```
## Usage
```js
import traverse from "@babel/traverse";
import annotateAsPure from "@babel/helper-annotate-as-pure";
// ...
traverse(file, {
CallExpression(path) {
annotateAsPure(path);
},
});
```
## Caveat with UglifyJS pre v3.1.0
`@babel/helper-annotate-as-pure` will append any existing leading comments to the `#__PURE__` annotation. Versions of UglifyJS prior to v3.1.0 will **ignore** these annotations, as they only check the _last_ leading comment for the annotation.
For example, using the `Usage` snippet above:
**In**
```js
const four = /* foo */ add(2, 2);
```
**Out**
```js
const four = /* #__PURE__ */ /* foo */ add(2, 2);
```
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