Web Reference: 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. 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. // 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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