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Dev.to
6/19/2026
Structuring TypeScript: Interfaces, Type Aliases, Enums, and Object Types

Structuring TypeScript: Interfaces, Type Aliases, Enums, and Object Types

Short summary

Learn when to use TypeScript interfaces, type aliases, and enums for modeling real-world data. Interfaces describe object shapes with optional/readonly properties and inheritance; type aliases handle primitives and unions flexibly; enums group named constants with readable values. Includes comparison tables and realistic user/order workflow examples.

  • Interfaces describe object shapes with optional/readonly properties and inheritance support
  • Type aliases handle primitives, unions, and combinations more flexibly than interfaces
  • Enums provide named constant groups with human-readable string values preferred for APIs
  • Use interfaces for real-world entities and type aliases for flexible type combinations

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