import { SVGElementNode } from '../types';
/**
 * Represents a line in text layout with its position
 */
export interface Line {
    y: number;
    x: number;
}
/**
 * Array of lines, sorted by y-coordinate with unique y-values
 */
export type Lines = Line[];
/**
 * Extracts lines from tspan elements, handling multiple tspans on the same line
 */
export declare function extractLinesFromTspans(tspanStrings: string[]): Lines;
/**
 * Extracts lines from a text element's innerHTML
 */
export declare function extractLinesFromElement(element: SVGElementNode): Lines;
/**
 * Calculates the height of a text element based on its lines
 */
export declare function calculateTextElementHeight(element: SVGElementNode, oldLineHeight?: number): {
    height: number;
    lineHeight: number;
};
/**
 * Shifts elements whose top is below the given y-coordinate
 */
export declare function shiftElementsBelow(svgTree: SVGElementNode, belowY: number, deltaY: number): void;