In this talk, we'll discuss about 1. Why everyone is moving towards the build time optimizations , be it your component library or styling engines or anything that involves a JS runtime. 2. We'll also understand how you can adopt to these modern architectures. 3. Discuss some case studies that shows the performance gains from adopting to such patterns. 4. Learn how to understand and write babel/webpack plugins 5. How the compilers & transpilers see your code explaining in depth about Abstract Syntax Trees. In the end, we'll build a quick demo of a babel plugin and see the whole flow that was previously discussed working live.