Vue CLI Plugin for Rollup ESM Bundling

This package, `vue-cli-plugin-rollup-esm-bundler`, is a Vue CLI 3.0 plugin intended to integrate Rollup as an ESM bundler into Vue projects. As of its latest version, 0.2.5, the plugin is explicitly marked 'Under Construction' in its README and appears to be abandoned, with no significant development or updates since 2019. Rollup itself is a module bundler for JavaScript that compiles smaller code segments into larger applications or libraries, leveraging the standardized ES module format for efficient and tree-shaking-friendly output. This plugin aimed to provide a Vue CLI integration for this process, potentially offering an alternative to the default Webpack setup. However, due to its incomplete state and lack of maintenance, it is not functional or recommended for any practical use. Its release cadence was sporadic and ceased before reaching a stable 1.0 release. Key differentiators, such as user-configurable Rollup options, were planned but never fully implemented.