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Python
Literal + match for Exhaustive Switching
`Literal` pins a value to specific strings/ints. Combine with the match statement (Python 3.10+) and a `_ : assert_never` clause for exhaustiveness — every variant must be handled or mypy yells at you.
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TypeScript
Exhaustive `assertNever`
Compile-time guarantee that every variant of a union is handled. When you add a new variant later, every switch missing that case becomes a type error. The runtime version is a safety net.
TypeScript
Discriminated Unions with Exhaustive Switch
Discriminated (tagged) unions give you compiler-checked state machines. Pair with `assertNever` to force every new variant to be handled at every switch site — refactors stop being scary.