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. The easiest way to see how interfaces work is to start with a simple example: The type checker checks the call to printLabel. Sep 11, 2025 · An interface in TypeScript is a contract that defines the structure of an object. It specifies the properties and methods that an object must have, without providing any implementation. 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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