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Dart sealed classes let you define a closed set of related types that can only be extended, implemented, or mixed in within the same library. This gives the compiler complete knowledge of every possible subtype, which unlocks powerful static analysis and safer pattern matching. When you mark a class as sealed, you’re telling Dart: “These are all the types that will ever exist in this hierarchy.” Because no external code can add new subtypes, the compiler can verify that your switch expressions are exhaustive, preventing subtle runtime errors. Sealed classes are especially useful for modeling state machines, API responses, or domain events where each case must be handled explicitly. They also work seamlessly with pattern matching, allowing you to destructure and analyze objects with confidence. Unlike abstract classes, sealed classes restrict extension boundaries, and unlike enums, they allow rich data and behavior. This makes them a flexible yet safe tool for expressing tightly controlled type hierarchies.

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