import type { FilePlaybackStrategy } from '../interfaces';
/**
 * Playback strategy for Node.js environments.
 * Encodes the audio buffer into a WAV file and saves it to the disk.
 */
export declare class FilePlayer implements FilePlaybackStrategy {
    volume: number;
    private _sampleRate;
    constructor(sampleRate?: number);
    get sampleRate(): number;
    /**
     * Updates the sample rate used when encoding WAV output files.
     * Set this after loading the sampler to match the source WAV's actual rate.
     */
    set sampleRate(rate: number);
    /**
     * Encodes and writes the provided audio buffer to a local .wav file.
     * @param bufferData The audio data to save.
     * @param outputDir The directory to save the file in.
     */
    play(bufferData: Float32Array, outputDir: string): Promise<string>;
    /**
     * Merges multiple audio buffers into one and plays the result.
     * @param buffers Array of Float32Array audio chunks.
     * @param outputDir The directory to save the file in.
     */
    drainAndPlay(buffers: Float32Array[], outputDir: string): Promise<string>;
    private encodeWAV;
    private writeString;
}