Web Reference: Dec 18, 2025 · Learn when to use TypeScript types vs. interfaces, with practical guidance on React props, advanced mapped and template literal types, and common pitfalls. So, what’s the difference between interface and type? interface is a real type definition, while type is just an alias of a type. When TS evaluate them, interface is lazy, it will only be expanded when necessary, while type is eager, it will be expanded immediately. // One major difference between type aliases vs interfaces are that interfaces are open and type aliases are closed. This means you can extend an interface by declaring it a second time.
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