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is-kit v1.16.0 adds discriminated union fallback support

Original: is-kit v1.16.0 is out 🎉 Added discriminatedUnionWithFallback for handling future discriminant values at open boundaries

The TypeScript validation library is-kit has released version 1.16.0, introducing a discriminatedUnionWithFallback feature. It is aimed at handling unknown discriminant values at open boundaries such as APIs and webhooks: unrecognized variants are routed to an explicit fallback, while invalid known variants still fail, keeping unions finite and exhaustive checks intact.

Why now: Developers are interested in a practical pattern for safely handling future or unknown API payload variants

is-kit

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Evidence

• is-kit v1.16.0 is out 🎉 Added discriminatedUnionWithFallback for handling future discriminant values at open boundaries like APIs and webhooks. Unknown variants → explicit fallback Invalid known variants → still fail And the resulting union stays finite enough for exhaustive… · nyaomaru · 1

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