import type BuiltInKeywords from './builtin_keywords';
declare class Porcupine {
    private _handle;
    private _frameLength;
    private _sampleRate;
    private _version;
    /**
     * Gets all available devices that Porcupine can use for inference. Each entry in the list can be the `device` argument
     * of the constructor.
     *
     * @returns Array of all available devices that Porcupine can use for inference.
     */
    static getAvailableDevices(): Promise<any>;
    /**
     * Static creator for initializing Porcupine from one of the built-in keywords
     * @param accessKey AccessKey obtained from Picovoice Console (https://console.picovoice.ai/.
     * @param keywords List of keywords (phrases) for detection. The list of available (default) keywords can be retrieved
     * using `Porcupine.KEYWORDS`. If `keyword_paths` is set then this argument will be ignored.
     * @param modelPath Path to the file containing model parameters. If not set it will be set to the default location.
     * @param device String representation of the device (e.g., CPU or GPU) to use for inference.
     * If set to `best`, the most suitable device is selected automatically. If set to `gpu`, the engine uses the
     * first available GPU device. To select a specific GPU device, set this argument to `gpu:${GPU_INDEX}`, where
     * `${GPU_INDEX}` is the index of the target GPU. If set to `cpu`, the engine will run on the CPU with the
     * default number of threads. To specify the number of threads, set this argument to `cpu:${NUM_THREADS}`,
     * where `${NUM_THREADS}` is the desired number of threads.
     * @param sensitivities sensitivities for each keywords model. A higher sensitivity reduces miss rate
     * at the cost of potentially higher false alarm rate. Sensitivity should be a floating-point number within
     * [0, 1].
     * @returns An instance of the engine.
     */
    static fromBuiltInKeywords(accessKey: string, keywords: BuiltInKeywords[], modelPath?: string, device?: string, sensitivities?: number[]): Promise<Porcupine>;
    /**
     * Static creator for initializing Porcupine from a list of paths to custom keyword files
     * @param accessKey AccessKey obtained from Picovoice Console (https://console.picovoice.ai/).
     * @param keywordPaths Absolute paths to keyword model files.
     * @param modelPath Path to the file containing model parameters. If not set it will be set to the default location.
     * @param device String representation of the device (e.g., CPU or GPU) to use for inference.
     * If set to `best`, the most suitable device is selected automatically. If set to `gpu`, the engine uses the
     * first available GPU device. To select a specific GPU device, set this argument to `gpu:${GPU_INDEX}`, where
     * `${GPU_INDEX}` is the index of the target GPU. If set to `cpu`, the engine will run on the CPU with the
     * default number of threads. To specify the number of threads, set this argument to `cpu:${NUM_THREADS}`,
     * where `${NUM_THREADS}` is the desired number of threads.
     * @param sensitivities sensitivities for each keywords model. A higher sensitivity reduces miss rate
     * at the cost of potentially higher false alarm rate. Sensitivity should be a floating-point number within
     * [0, 1].
     * @returns An instance of the engine.
     */
    static fromKeywordPaths(accessKey: string, keywordPaths: string[], modelPath?: string, device?: string, sensitivities?: number[]): Promise<Porcupine>;
    private constructor();
    /**
     * Process a frame of audio with the wake word engine.
     * @param frame A frame of audio samples to be assessed by Porcupine. The required audio format is found by
     * calling `.sampleRate` to get the required sample rate and `.frameLength` to get the required frame size.
     * Audio must be single-channel and 16-bit linearly-encoded.
     * @returns {Promise} Index of the detected keyword, or -1 if no detection occurred
     */
    process(frame: number[]): Promise<any>;
    /**
     * Frees memory that was allocated for Porcupine
     */
    delete(): Promise<any>;
    /**
     * Gets the required number of audio samples per frame.
     * @returns Required frame length.
     */
    get frameLength(): number;
    /**
     * Get the audio sample rate required by Porcupine.
     * @returns Required sample rate.
     */
    get sampleRate(): number;
    /**
     * Gets the version number of the Porcupine library.
     * @returns Version of Porcupine
     */
    get version(): string;
    /**
     * Gets the Error type given a code.
     * @param code Code name of native Error.
     * @param message Detailed message of the error.
     */
    private static codeToError;
}
export default Porcupine;