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Discussion on: Convince me that types are awesome

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Jonathan Kuhl

User input cannot be caught by Typescript, because user input is brought in at runtime.

You don't run Typescript, you compile it to JavaScript and run the JavaScript, so by the time it's running, type information is discarded.

However, Typescript will help you prepare a function to receive user input by setting up the appropriate types, but that's as far as it can go.