/**
 * Runtime validation schema and wrapper for transformers.js TTS adapter options.
 *
 * @module @nhtio/adk/batteries/tts/transformers_js/validation
 *
 * @remarks
 * Validates `TransformersJsTtsAdapterOptions` at construction time. Throws
 * `E_INVALID_TRANSFORMERS_JS_TTS_OPTIONS` on failure. `model` is required; unknown top-level keys are
 * rejected so typos fail loud.
 */
import type { TransformersJsTtsAdapterOptions } from "./types";
/** Validator schema for `TransformersJsTtsAdapterOptions`. Rejects unknown top-level keys. */
export declare const transformersJsTtsOptionsSchema: import("@nhtio/validation").ObjectSchema<TransformersJsTtsAdapterOptions>;
/**
 * Validates an arbitrary input against `transformersJsTtsOptionsSchema`.
 *
 * @param input - The raw options object to validate.
 * @returns The resolved options object with defaults filled in.
 * @throws {@link @nhtio/adk/batteries!E_INVALID_TRANSFORMERS_JS_TTS_OPTIONS} when invalid.
 */
export declare const validateOptions: (input: unknown) => TransformersJsTtsAdapterOptions;