es3ify-loader

A webpack loader that transforms JavaScript code to be ES3-compatible by converting reserved words (like catch, const, etc.) and other ES3-incompatible syntax. Version 0.2.0 is the latest release, with no recent updates since 2016. It relies on a PostCSS-based transformation approach. Different from other ES3ify tools (e.g., es3ify-webpack-plugin), this one operates as a loader for per-file transformation.