refactor(@angular-devkit/core): don't use concrete type as interface #30226
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Set
isn't a stable interface, it's a concrete type that changes over time (new spec versions may add methods, older ones may lack methods). There shouldn't be a huge downside to just declaring this class as "its own thing".Follow-up to #30208 which breaks on google3 import because the
Set
types are subtly different because of different TS configs.