activeSub property
The node currently (re)computing, if any — reads reaching
DependencyTracker.reportRead while this is non-null are linked as
engine dependencies of it.
O nó atualmente (re)computando, se houver — leituras que chegam a
DependencyTracker.reportRead enquanto isto é não-nulo são ligadas
como dependências dele no motor.
Implementation
ReactiveNode? activeSub;