import type { ZodSchema } from 'zod';
import type { DomainObjectClass } from './DomainObjectClass';
import type { DomainObjectRefBy } from './DomainObjectPragma';
/**
 * .what = returns a dobj's `.contract.ref(by)`: a zod schema of only the referenced key fields,
 *   stamped with an `x-domain-object-ref` pragma so a *reference* survives `z.toJSONSchema()`
 * .why =
 *   - `.contract` embeds the WHOLE dobj (composition); a field that only *names* another dobj by
 *     key needs a smaller, stamped form — this is that form
 *   - lets a cross-service consumer emit a typed `RefBy*<typeof X>` instead of an anonymous shape
 * .note = memoized per class + per `by` (via getContractRefSeen), so repeated access — and any
 *   nested-dobj recursion — returns the same stamped instance
 */
export declare const getContractRef: (dobj: DomainObjectClass, by: DomainObjectRefBy) => ZodSchema<any>;