In an app split into 30 modules, the DI container initializes services in an order someone maintains by hand, and it crashed with "A needs B and B needs A." What algorithm gives you a safe initialization order from the dependency graph?
Treat dependencies as a directed graph (a DAG) and get the initialization order from a topological sort, either Kahn's in-degree queue or reversed DFS post-order. The same idea is SPM's module graph, where changing a hub module recompiles everything downstream.
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