import type { ElementSymbol } from '../element/types';
import * as math from '../math';
import type { AnyStructure } from '../structure/index';
import type { Pbc } from '../structure/pbc';
import type { TrajectoryFrame } from './index';
export declare function validate_3x3_matrix(data: unknown): math.Matrix3x3;
export declare const convert_atomic_numbers: (numbers: number[]) => ElementSymbol[];
export declare const create_structure: (positions: number[][], elements: ElementSymbol[], lattice_matrix?: math.Matrix3x3, pbc?: Pbc, force_data?: number[][]) => AnyStructure;
export declare const create_trajectory_frame: (positions: number[][], elements: ElementSymbol[], lattice_matrix: math.Matrix3x3 | undefined, pbc: Pbc | undefined, step: number, metadata?: Record<string, unknown>) => TrajectoryFrame;
export declare const read_ndarray_from_view: (view: DataView, ref: {
    ndarray: unknown[];
}) => number[][];
export declare const copy_numeric_fields: (target: Record<string, number>, source: Record<string, unknown>, fields: readonly string[]) => void;
export declare function calc_force_stats(forces: number[][]): {
    force_max: number;
    force_norm: number;
} | null;
export declare function iter_xyz_frames(lines: string[]): Generator<{
    start: number;
    num_atoms: number;
    comment: string;
}>;
export declare function count_xyz_frames(data: string): number;