packages/babel-plugin-transform-parameters/src/index.js
import { declare } from "@babel/helper-plugin-utils";
import convertFunctionParams from "./params";
import convertFunctionRest from "./rest";
export { convertFunctionParams };
export default declare((api, options) => {
api.assertVersion(7);
const { loose } = options;
return {
name: "transform-parameters",
visitor: {
Function(path) {
if (
path.isArrowFunctionExpression() &&
path
.get("params")
.some(param => param.isRestElement() || param.isAssignmentPattern())
) {
// default/rest visitors require access to `arguments`, so it cannot be an arrow
path.arrowFunctionToExpression();
}
const convertedRest = convertFunctionRest(path);
const convertedParams = convertFunctionParams(path, loose);
if (convertedRest || convertedParams) {
// Manually reprocess this scope to ensure that the moved params are updated.
path.scope.crawl();
}
},
},
};
});