Keeping up to date with external software dependencies is important to keep code healthy.
babel-present-env has been archived and moved into babel core. Update it and related dependencies to the latest with best practices in MediaWiki's Page-Previews extension.
$:user\> grep -r "babel-preset-env" . ./package.json: "babel-preset-env": "1.6.0", ./package-lock.json: "babel-preset-env": { ./package-lock.json: "resolved": "https://registry.npmjs.org/babel-preset-env/-/babel-preset-env-1.6.0.tgz",