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What are Declaration Files (.d.ts) in TypeScript?

Declaration files describe the shape of JavaScript code without providing implementations. They allow TypeScript to understand external libraries and provide type checking, autocomplete, and documentation support. Many popular JavaScript libraries ship with declaration files, and developers can create custom declarations when needed.

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What is the difference between interfaces and type aliases in TypeScript?

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What is TypeScript and how is it different from JavaScript?

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What are interfaces in TypeScript?

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JB

Jeevan Bhargav

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This answer is calibrated for technical interviews. Verify benchmarks in local sandboxes before deploying.