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. Sep 11, 2025 · In TypeScript, an interface defines a contract for properties and methods. A class that implements an interface must provide concrete implementations, ensuring consistency and type safety. When creating or maintaining TypeScript definitions for pure JavaScript modules, interfaces should probably be used for everything that is a class in the original module; particularly examples like chai, where the modules are designed to be extended through plug-ins.
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