/**
 * STT adapter factory with type guards
 *
 * Uses discriminated unions and lazy loading following SDK patterns.
 */
import type { GetSTTOptions, STTAdapter } from './types.js';
/**
 * Create an STT adapter
 *
 * Uses lazy loading to only import the requested adapter.
 *
 * @example
 * ```ts
 * // Browser Speech API (default)
 * const stt = await getSTT();
 *
 * // Explicit Browser Speech
 * const stt = await getSTT({ type: 'browser-speech' });
 *
 * // Whisper.cpp (recommended for accuracy)
 * const stt = await getSTT({ type: 'whisper-cpp', model: 'tiny.en' });
 *
 * // Whisper WASM (transformers.js - has known issues)
 * const stt = await getSTT({ type: 'whisper-wasm', modelSize: 'tiny' });
 * ```
 */
export declare function getSTT(options?: GetSTTOptions): Promise<STTAdapter>;
/**
 * Auto-detect and create the best available STT adapter
 *
 * Selection priority:
 * 1. Whisper WASM if WebGPU is available (best accuracy)
 * 2. Browser Speech API if available (no download)
 * 3. Whisper WASM as fallback
 *
 * @throws {CapabilityNotAvailableError} If no STT adapter is available
 *
 * @example
 * ```ts
 * const stt = await getSTTAuto();
 * console.log(`Using ${stt.type} adapter`);
 * ```
 */
export declare function getSTTAuto(options?: Partial<Omit<GetSTTOptions, 'type'>>): Promise<STTAdapter>;
/**
 * Check if a specific STT backend is available
 */
export declare function isSTTAvailable(type: 'browser-speech' | 'whisper-wasm'): boolean;
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