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What does the declare keyword do?

Q: What does the declare keyword do?

**`declare`** introduces an ambient declaration — telling the compiler something exists at runtime without emitting code (e.g. `declare const VERSION: string` for a global injected by the build). It's how you type globals and external scripts.

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Explain ambient declarations.

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declare introduces an ambient declaration — telling the compiler something exists at runtime without emitting code (e.g. declare const VERSION: string for a global injected by the build). It's how you type globals and external scripts.

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