8b57a3e3b9
* Migrate the following packages' tests:
* babel-helper-annotate-as-pure
* babel-helper-module-imports
* babel-helper-transform-fixture-test-runner
* babel-highlight
* babel-node
* babel-plugin-transform-modules-commonjs
* babel-preset-env-standalone
* babel-preset-env
* babel-preset-es2015
* babel-preset-react
* babel-standalone
* babel-template
* babel-traverse
* babel-types
@babel/helper-annotate-as-pure
API
declare export default annotateAsPure(nodeOrPath: Node | NodePath);
Usage
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
const four = /* foo */ add(2, 2);
Out
const four = /* #__PURE__ */ /* foo */ add(2, 2);