You're definitely right, string inspection of JavaScript is not really a thing, I'm not aware of it being done and it wouldn't be reliable unless you had something that powerful than a regex.

I will say though, that I have seen some products out there today that work by rendering text as pixels on a <canvas>, so that accessibility if you can't read it with your eyes, searchability, discoverability, etc are nonexistent.

This is something WASM could inadvertently encourage a higher percentage of products to use for whatever purpose. Same thing people did with flash.