I half agree with your response. It's true that third-party data sources need to be validated using runtime type checks, whether in explicit custom code or through some schema validator framework. But TypeScript is very helpful in the common case where the caller is fully typed, so the callee doesn't need to do all the needless defensive checking.
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I half agree with your response. It's true that third-party data sources need to be validated using runtime type checks, whether in explicit custom code or through some schema validator framework. But TypeScript is very helpful in the common case where the caller is fully typed, so the callee doesn't need to do all the needless defensive checking.