The **vue-template-es2015-compiler** is an internal build‑time tool used by `vue-loader` and `vueify` to enhance Vue 2 templates. It transpiles ES2015 syntax (via a Buble fork) within template expressions and strips the `with` block from generated render functions, making them strict‑mode compliant and ready for modern browsers (with optional polyfills for older ones). It’s aimed at Vue developers who need ES2015 features in their component templates without adding runtime overhead.