Looking at https://wavesurfer-js.org/plugins and https://wavesurfer-js.org/example/spectrogram/index.html it is entirely unclear how this plugin is supposed to get loaded.

The second link has an example that is literally impossible, because you can't reference a variable before it's been declared (the wavesurfer var does not exist yet, so the wavesurfer: wavesurfer instruction is an error),

How would you recommend fixing negative values in barChar? I can't explain properly, so I'll show you an example:

2010: 0+0+0+0
2011: 0+0+0+0
2012: 0+0+0+0
2013: 0+5+8+0
2014: -38+0+13+0
2015: 45+12+130+0
2016: 0+0+0+0

I think that the xAxis should stay in y=0, and the

Wondering if you could provide a basic example on how to use this in a express app?