How to Deploy a Babel‑Transpiled Project to Production

What is a reliable, step‑by‑step process for taking a JavaScript project that uses Babel for transpilation and deploying it to a production environment? I need a clear workflow that covers installing Babel, configuring presets and plugins, compiling the code, and finally deploying the compiled output (e.g., to a CDN or a Node.js server). The question should include prerequisites (Node.js, npm, Babel CLI), numbered steps, how to verify the build, and how to roll back if the deployment fails. Provide concrete examples, such as a simple index.js that uses ES2020 syntax and a .babelrc configuration. The answer should explain how Babel’s --watch flag can help during development, but how to handle production builds with --minified and source maps. It should also touch on integrating Babel into a CI/CD pipeline, e.g., with GitHub Actions, and how to ensure the compiled bundle works in legacy browsers that Babel targets.