Why not have a look at QuickJs. I assume your reason is to run js in the browser in an isolated environment for security reasons? I’ve found this article from figma to be an excellent starting point [0] Also useful to consider this benchmark [1] of js runtimes.

We’ve found quickjs-emscripten [2] to work really well thus far. You can see my implementation of it here [3] in Lowdefy. If still has a few rough edges, so would be really keen to make it better.

I’m interested to know, is spidermonkey more comparable to V8 than QuickJs?

[0] - https://www.figma.com/blog/how-we-built-the-figma-plugin-sys... [1] - https://bellard.org/quickjs/bench.html [2] - https://github.com/justjake/quickjs-emscripten [3] - https://github.com/lowdefy/lowdefy/blob/main/packages/operat...