Any name works for a validation type, Event, Response, Error or Record included.

KosmoJS resolves a name the way your editor does: a type declared in the route, or imported into it, is the type the schema is built from, whatever built-in shares its name.

// ✅ the schema is built from this Event, not the DOM's
type Event = { id: number; name: string; timestamp: string };

export default defineRoute<"events">(({ POST }) => [
  POST<{ json: Event }>(async (ctx) => { /* ... */ }),
]);

The same holds for a type imported from another file, and for a name imported under an alias.

Runtime Types

Five names mean a runtime type when nothing of yours is in scope:

Name	Validates
Date	a Date instance
File	a File instance
Blob	a Blob instance
Buffer	a Node Buffer
ArrayBuffer	an ArrayBuffer

Declare or import your own Date and the schema uses yours instead - so a type named after one of these replaces the runtime check, by design. Response types ›

Names That Do Not Resolve

A name with no declaration the route can reach - a typo, a type from a file that was moved, a type built from a value with typeof - cannot become a schema. KosmoJS reports it when the route is built, naming the route and the type, and the route's validators refuse to load until it resolves. Details ›