import type { TrajectoryPositionStream } from '../trajectory';
import type { EinsteinFit, EinsteinFitOptions, MsdOptions, MsdResult } from './index';
export declare function fit_einstein_diffusion(lags: number[], times: number[], msd: number[], options?: EinsteinFitOptions & {
    time_unit?: string;
}): EinsteinFit | null;
export declare function calc_msd(input: TrajectoryPositionStream, options?: MsdOptions): MsdResult;