Arktype Patterns

Patterns for composing arktype schemas, naming runtime schema values alongside inferred types, and building discriminated unions with .merge() and .or().

base.merge(type.or(...)) Pattern (Recommended)

Use when you have shared base fields and per-variant payloads discriminated on a literal key. .merge() distributes over unions: it merges the base into each branch of the union automatically.

import { type } from 'arktype';

const commandBase = type({
	id: 'string',
	deviceId: DeviceId,
	createdAt: 'number',
	_v: '1',
});