Discriminated unions vs class hierarchy khi nào dùng cái nào?

Discriminated unions: prefer khi data-centric, cần exhaustive matching, serializable (Redux actions, API responses).

• Redux Toolkit createSlice actions là ví dụ thực tế điển hình — mỗi action type là một discriminated union member và reducers exhaustively switch qua chúng.
• Class hierarchy: khi cần behavior với data, encapsulation, OOP patterns.
• TypeScript exhaustiveness checking qua never type.

Discriminated unions: prefer when data-centric, need exhaustive matching, or data must be serializable (Redux actions, API responses).

• Redux Toolkit createSlice actions are a prime real-world example — each action type is a discriminated union member and reducers exhaustively switch through them.
• Class hierarchy: when you need behavior bundled with data, encapsulation, or OOP patterns.
• TypeScript exhaustiveness checking uses the never type.