/**
 * JSON Schema helpers that route through the `SchemaValidator` extension
 * contract, so core modules can convert opaque `Schema<T>` instances to
 * JSON Schema documents without importing zod (or any other validator).
 *
 * @module schemas/json-schema
 */
import type { JsonSchema, JsonSchemaValidationFunction, Schema } from "../extensions/schema/index.js";
/**
 * Convert an opaque `Schema<T>` to a JSON Schema document.
 *
 * Resolves the registered `SchemaValidator` and delegates to its
 * `toJsonSchema` implementation. Callers should pass a `Schema<T>` produced
 * by `defineSchema` or any other contract-aware builder.
 */
export declare function schemaToJsonSchema(schema: Schema<unknown>): JsonSchema;
/**
 * Returns `true` when the schema permits `undefined`.
 *
 * Resolves the registered `SchemaValidator` and delegates to its
 * `isOptional` implementation.
 */
export declare function isOptionalSchema(schema: Schema<unknown>): boolean;
/**
 * Compile a raw JSON Schema through the registered validator extension.
 *
 * This helper is intentionally internal. Raw-schema consumers must fail
 * during materialization when a custom validator adapter does not implement
 * the optional compilation capability.
 */
export declare function compileJsonSchemaValidator<T = unknown>(schema: JsonSchema): JsonSchemaValidationFunction<T>;
/**
 * Compile a raw JSON Schema when the registered adapter supports it.
 *
 * Older third-party adapters predate this optional capability. Callers that
 * only need to transmit a schema can remain compatible and defer the explicit
 * capability error until local validation is actually requested.
 */
export declare function tryCompileJsonSchemaValidator<T = unknown>(schema: JsonSchema): JsonSchemaValidationFunction<T> | undefined;
export type { JsonSchema };
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