/**
 * SpecialOpenApi — Deduplicates `components/schemas` entries in an OpenAPI spec
 * and applies JSON Schema post-processing (null removal, allOf flattening).
 *
 * When `OpenApi.fromApi` generates the spec, different AST nodes sharing the
 * same identifier can produce duplicate entries (e.g. "X" and "X1") in
 * `components.schemas`. This module provides a transform function that
 * collapses those duplicates, rewrites all `$ref` pointers accordingly,
 * and post-processes schemas for better codegen compatibility.
 *
 * Usage with the OpenApi `Transform` annotation:
 *
 * ```ts
 * import { OpenApi } from "effect/unstable"
 * import { deduplicateOpenApiSchemas } from "./SpecialOpenApi.js"
 *
 * const api = HttpApi.make("myApi")
 *   .pipe(HttpApi.annotateContext(OpenApi.annotations({ transform: deduplicateOpenApiSchemas })))
 * ```
 */
/**
 * Deduplicates `components.schemas` entries in an OpenAPI spec.
 *
 * Entries sharing the same base identifier (e.g. "X" and "X1") whose JSON
 * representations are identical are collapsed into a single canonical entry,
 * and all `$ref` pointers throughout the spec are rewritten to point to
 * the canonical key.
 *
 * Designed to be used as the `transform` option in `OpenApi.annotations`.
 */
export declare function deduplicateOpenApiSchemas(spec: Record<string, any>): Record<string, any>;
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