I find it hard to imagine people the desktop/commercial audio world wanting to write plugins in JS. At a glance, this seems like an interesting webaudio project that is trying to be too much. Plugins are used in a very different situation where low latency and high performance trump pretty much everything. Reconciling that with web dev priorities seems optimistic.
Yeah. I got lost at JS. Buffers and buffer manipulation are everything in audio processing, I don’t see anything stealing C/C++’s thunder here except Rust.
Also, as another user here has already pointed out, the "plugin development kit" is still macos only, though I anticipate releasing the windows version within hopefully a week or two.
Last time I checked, a perpetual JUCE license was priced similar to 3 days from a C++ freelancer. I've never heard it being called out on price before.
It would be huge if you could make cross-platform AU/VST*/AAX without the costs of JUCE, but I suspect that isn't on offer here.