HELPERS_FOLDER.pathname may be URL-encoded, if the working tree's absolute path contains spaces, some reserved characters, or anything beyond ASCII. readFile accepts a plain String or URL for the path, but does not automatically decode URL-encoded Strings.
@babel/helpers
Collection of helper functions used by Babel transforms.
See our website @babel/helpers for more information.
Install
Using npm:
npm install --save-dev @babel/helpers
or using yarn:
yarn add @babel/helpers --dev