alt Hacker News> the whole point of WebAssembly is to solve this one problem.
For Wasm to be a secure sandbox, you have to assume a bug-free compiler/interpreter, which, alas, none of them really are. It's a somewhat easier problem than building a bug-free JavaScript runtime, but not by as much as you might expect, sadly.
> I want to build extension systems for my own apps such that users can run their own code or paste in code written by other people and have it execute safely. Similar to Shopify Functions: https://shopify.dev/docs/apps/build/functions
Ah, this is exactly the Workers for Platforms use case: https://developers.cloudflare.com/cloudflare-for-platforms/w...
And indeed, Shopify uses it: https://shopify.engineering/how-we-built-oxygen
(There's also the upcoming Dynamic Worker Loader API: https://developers.cloudflare.com/workers/runtime-apis/bindi...)
But it sounds like you really do want to self-host? I don't blame you, but that does make it tough. I'm not sure there's any such thing as a secure sandbox that doesn't require some level of monitoring and daily maintenance, sadly. (But admittedly I may be biased.)
Yeah my ideal is to have something that cleanly "pip installs" as a dependency such that users of my open source Python projects can self host tools that let them extend using arbitrary code, including code written by LLMs.
I've been picking at this problem for a few years now!
On the one hand I get why it's so hard. But it really feels like it should be possible to solve this in 2026 - executing arbitrary code in a way that constrains its memory and CPU time usage is a problem our industry solves in browsers and hosting platforms and databases and all sorts of other places, and has done for decades.
The whole LLM-assisted end-user programming thing makes solving this with the right developer affordances so valuable!