import type { OpenAPIV3_1 } from 'openapi-types';
/**
 * Normalise all `nullable: true` / `x-nullable: true` usages in the spec into
 * the OpenAPI 3.1 null-union form so the types and zod plugins pick them up
 * through their existing `'null'`-in-type-union logic.
 *
 * Operates in-place on the document passed from `parseSpec()`. Call this once
 * immediately after bundling, before any plugin runs.
 */
export declare function normalizeNullable(spec: OpenAPIV3_1.Document): void;
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