SwingSetConfigDescriptor: Record<string, SwingSetConfigProperties>

Where the property name is the name of the vat. Note that the bootstrap property names the vat that should be used as the bootstrap vat. Although a swingset configuration can designate any vat as its bootstrap vat, loadBasedir will always look for a file named 'bootstrap.js' and use that (note that if there is no 'bootstrap.js', there will be no bootstrap vat).