v8go VS quickjs-emscripten

Firstly, I used rogchap/v8go to execute JavaScript in a Go environment. I listed other options below.

Now the only issue I see is that someone who can't be bothered to install PHP and composer will probably not want to install node and npm either. If you could somehow run WASM inside an executable file (maybe something written in Go with https://github.com/rogchap/v8go ? Or an Electron App ?), all you'd need to do is download the executable file on any computer and double click it to start serving a Laravel project.

I only browsed for a wee bit, so take this with some salt, but it _looks_ like the framework is running a JS VM isolate alongside the Go server struct[1], which gets called with whatever script file is being rendered. Since it looks like the render files are, at least in the case of Svelte, individually compiled JS files that are SSR rendered via the V8 isolate, I _believe_ you're correct that there is no CSR (though there might still be JS-hydrated code if the Svelte component included something involving an interactive component).

I think the idea is to ingest a JS "template" and spit out the rendered HTML+JS, kind of like traditional SSR templates, but it could be possible to shoe-horn in an entire client-side router that gets initialized as a DOM object somewhere.

[1] https://github.com/rogchap/v8go

https://github.com/rogchap/v8go is a viable option these days as well.

Plenti is a simple open source Static Site Generator (SSG) with a Go backend and Svelte frontend. Jim picked Golang because it is simple, quick and has the ability to generate a binary that can be run on any machine; and Svelte, well, for one, “Svelte is so hot right now” and also because of the power it gives developers to write simple HTML and CSS to create websites. Merging these two technologies was not an easy task, but with V8Go binding the two together, it’s a marriage that works.

The foundation of my package is built upon the excellent work done by the quickjs-emscripten project (https://github.com/justjake/quickjs-emscripten). They've done the crucial work of compiling QuickJS to WebAssembly, enabling its use in web and Node.js environments. What I've created is a high-level abstraction layer around this WebAssembly implementation, designed with developer experience in mind.

The underlying quickjs-emscripten library has APIs for exposing host functions, calling guest functions, custom module loaders, etc: https://github.com/justjake/quickjs-emscripten?tab=readme-ov...

The thing I want to achieve with WebAssembly is still proving a lot harder than I had anticipated.

I want to be able to take strings of untrusted code provided by users and execute them in a safe sandbox.

I have all sorts of things I want this for - think custom templates for a web application, custom workflow automation scripts (Zapier-style), running transformations against JSON data.

When you're dealing with untrusted code you need a really robust sandbox. WebAssembly really should be that sandbox.

I'd like to support Python, JavaScript and maybe other languages too. I want to take a user-provided string of code in one of those languages and execute that in a sandbox with a strict limit on both memory usage and time taken (so I can't be crashed by a "while True" loop). If memory or time limit are exceeded, I want to get an exception which I can catch and return an error message to the user.

I've been exploring options for this for quite a while now. The furthest I've got was running Pyodide inside of Deno: https://til.simonwillison.net/deno/pyodide-sandbox

Surprisingly I've not found a good pattern for running a JavaScript interpreter in a WASM sandbox yet. https://github.com/justjake/quickjs-emscripten looks promising but I've not found the right recipe to call it from server-side Python or Deno yet.

Can Extism help with this? I'm confident I'm not the only person who's looking for a solution here!

"Safely execute untrusted Javascript in your Javascript, and execute synchronous code that uses async functions" quickjs-emscripten, NPM

This maybe, as a start?

https://github.com/justjake/quickjs-emscripten

QuickJS Running in WebAssembly\ (17 comments)

The library was inspired by Figma’s blog posts about their plug-in system: https://github.com/justjake/quickjs-emscripten#background

If you need to call into user-generated Javascript synchronously or have greater control over the sandbox environment, you can use WebAssembly to run a Javascript interpreter: https://github.com/justjake/quickjs-emscripten#quickjs-emscr...

QuickJS in WebAssembly is much slower than your browser's native Javascript runtime, but possibly faster than async calls using postMessage. As an added bonus, it can make async functions in the host appear to be synchronous inside the sandbox using asyncify: https://emscripten.org/docs/porting/asyncify.html.