FrontendHaltTypeScript·Intermediate·Conceptual·1 min read
Can discriminated unions model API responses?
Short interview answer
Yes, but untrusted JSON still needs runtime validation before it can be treated as the union. After validation, the discriminator provides safe control flow for success, domain error, and other response variants.
Key takeaway
Explain the underlying mental model clearly, then support it with a concrete example and its trade-offs.