home box fastbox

svelte-box playground

Two reactive containers, same surface. Pick one to see it run.

/box

Proxy-backed. Transparent property forwarding (box.foo reads the inner object), callable when wrapping a function, instanceof Box through subclasses.

/fastbox

Plain class, no proxy. Same .value reactivity, same helpers and type guards. Faster to construct, no transparent forwarding. Reach inner properties through .value.