Web Reference: In TypeScript, interfaces fill the role of naming these types, and are a powerful way of defining contracts within your code as well as contracts with code outside of your project. Dec 2, 2025 · Learn TypeScript interfaces for defining object shapes. Covers extending, optional and readonly properties, index signatures, and when to choose types instead. Feb 23, 2024 · In this article, we'll delve deep into TypeScript interfaces, exploring their syntax and use cases. You can get all the source code from here. What are TypeScript Interfaces? At its core, an interface in TypeScript is a syntactical contract that defines the expected structure of an object.
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