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. Sep 23, 2024 · In TypeScript, both interface and type are used to define the structure of objects, but they differ in flexibility and usage. While interface is extendable and primarily for object shapes, type is more versatile, allowing unions, intersections, and more complex type definitions.
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