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);
``