/// <reference types="node" />
import { TransformCallback } from "stream";
import { SpectralBuffer } from '../SpectralBuffer';
import { Transform } from 'stream';
/**
 * Measures the spectral flux of a SpectralBuffer object-stream.
 */
declare class SpectralFlux extends Transform {
    previousSpectrum: SpectralBuffer | null;
    constructor();
    _transform(spectrum: SpectralBuffer, encoding: string, callback: TransformCallback): void;
}
export { SpectralFlux };