Closure library/compiler was the only real way to write a large SPA back in 2012+. You had access to an amazing compiler with a standard library that was like

Closure library/compiler was the only real way to write a large SPA back in 2012+. You had access to an amazing compiler with a standard library that was like having every npm module you could ever need but written by Google and well maintained without the security risks. We still use it, and the only real “wish” we have is maybe if the jsdoc “type system” could just be replaced by TypeScript while maintaining all the rest of the library/compiler.