The Holy Hand Grenade
The Killer Rabbit of this has been contained. Not eliminated — it still lurks in the cave, in class bodies and framework callbacks and the occasional jQuery plugin that refuses to die. But it’s confined to the interop boundary, behind js: prefixes and kernel passthrough forms, and every approach to its cave is clearly marked.
The treasure — JavaScript’s entire ecosystem, every library, every API, every runtime — is accessible. You just need to know when to pull the pin.
“And the Lord spake, saying: ‘First thou pullest the colon. Then thou typest js. Then, the interop namespace being reached, thou invokest. Five shalt thou not type, neither shalt thou type three, excepting that thou then proceed to type js. Six is right out.’”