Explore a 29-minute conference talk from JSConf EU 2019 that delves into Stencil, a innovative build-time abstraction for web development. Discover how Stencil combines framework-like features with hand-optimized components using future-proof web APIs. Learn about the architecture of Stencil and the potential innovations a compiler can bring to your applications and design systems. Gain insights into hot module replacement, reactive properties, templating, CSS-in-JS, and lazy-loaded bundling from a new perspective. Understand how this built-time approach aims to enhance productivity while generating optimized components for modern web development.