KITFORMA · EDITORIAL ANSWER
How do I make a TypeScript switch fail compilation when a new status is added?
KitForma editorial guide. Use a discriminated union and assign the remaining value to never in the default branch: const unreachable: never = state.
Step-by-step answer
Use a discriminated union and assign the remaining value to never in the default branch:
const unreachable: never = state. Return or throw there. Adding a union variant then exposes unhandled branches. Verify by temporarily adding a status. Keep the discriminant literal; a broad string property cannot provide exhaustiveness.Sources and verification
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