[js] Outdated Javascript API externs

[ACrazyTown]

Recently I had to use the js.html.audio.AudioBuffer class and noticed an absence of some fields, in my case baseLatency and outputLatency. Looking at the js.html package on GitHub reveals that most classes haven't been updated in 6 years.

Are there plans to update the externs? Are the externs even automated anymore? I see a lot of files mention being automatically generated, but there have also been pull requests that manually add new features so I'm a bit confused on how it works