What a terrible acronym...that term was already used in the early 2000's for "single responsibility, open-closed, Liskov substitution, interface segregation and dependency inversion"
https://en.wikipedia.org/wiki/SOLID_(object-oriented_design)
Came to say the same... also, if I see anything else called "Unity" in software, like ever, I'll just go on an insane unidirectional killing spree (not really, but it's irritating to say the least).
I had expected a blog series on SOLID principles applied to JS.