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wouldn't it be nice if sites could share a cache of common js? ... stuff like react, or vue or svelte? 👉 there's an early stage proposal for cross-origin storage which enables exactly this. there are challenges but I think it's very interesting indeed

github.comGitHub - WICG/cross-origin-storage: Explainer for the Cross-Origin Storage (COS) APIExplainer for the Cross-Origin Storage (COS) API. Contribute to WICG/cross-origin-storage development by creating an account on GitHub.

Andersmmg

@andersmmg.bsky.social

27 June

Wonder how this will work with tree-shaking, though I imagine it'll be most useful for larger things like WASM binaries etc.

Thomas Steiner

@tomayac.com

By working with fullstack frameworks like Nuxt, we can make sure they output COS-friendly chunks that are the same for all Nuxt users on the same version. This even can mean bundling together different unrelated vendor libraries that just happen to be all used by the framework.

27/6/26, 7:37 am0 reposts5 likes

Andersmmg

@andersmmg.bsky.social

27 June

What about compiled frameworks like Svelte?

daniel r(ooooooh) at jsconf mx 🇲🇽

@danielroe.dev

27 June

i’m no svelte expert, but it’s hard to cache compile time output of a framework across sites but libraries used in svelte apps, like gsap, would be

Thomas Steiner

@tomayac.com

27 June

Yeah, the way I understand Svelte is that it essentially gets "compiled away," but as Dan says, there could still be other libraries or vendor artifacts that could profit. A COS-aware bundler certainly can help: SvelteKit <3 Vite from what I can tell.