What are Interfaces in TypeScript?

Instruction: Describe what interfaces are in TypeScript and how they are used.

Context: This question tests the candidate's understanding of interfaces in TypeScript and their ability to explain how interfaces define the shape of an object, enhancing code structure and contract definition.

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An interface names a structural type contract. It can describe an object's properties, methods or callable signature, and interfaces can extend compatible object contracts. The declaration is erased from emitted JavaScript.

interface User { name: string; email?: string } interface Formatter { (user: User): string } const format: Formatter = user => user.name.toUpperCase(); const stored =...

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