import type { TrajectoryFrame, TrajectoryType } from '../index';
export declare function parse_xyz_comment_metadata(comment: string): {
    step?: number;
    properties: Record<string, number>;
};
export declare function build_xyz_frame(lines: string[], frame: {
    start: number;
    num_atoms: number;
    comment: string;
}, opts: {
    frame_label: string;
    default_step: number;
}): TrajectoryFrame;
export declare function parse_xyz_trajectory(content: string): TrajectoryType;