import type { PPTLatexElement } from '../types/slides';
/**
 * Apply an editor save onto an existing formula.
 *
 * The canvas box (`width` / `height`) is the authored scale. Never replace it
 * with the newly measured natural size — `useLiveBoxFit` scales the new
 * formula into that box. `viewBox` stores the natural measure for export.
 */
export declare function latexPropsAfterEdit(_current: Pick<PPTLatexElement, 'width' | 'height'>, next: {
    latex: string;
    path?: string;
    w: number;
    h: number;
}): Pick<PPTLatexElement, 'latex' | 'path' | 'viewBox'>;
/** Same uniform scale `useLiveBoxFit` writes: authored box / natural viewBox. */
export declare function latexPaintScale(el: Pick<PPTLatexElement, 'width' | 'height' | 'viewBox'>): number;
/** Scale a measured formula so it stays inside the slide with a margin. */
export declare function fitLatexBoxToSlide(width: number, height: number, slideW: number, slideH: number, pad?: number): {
    width: number;
    height: number;
    left: number;
    top: number;
};
/**
 * Extract the contents of every equation (or equation*) environment.
 */
export declare const extractEquationLatex: (source: string) => string[];
/**
 * MathLive emits compact TeX (`4^5\cdot3x`). hfmath's tokenizer treats digits
 * as part of a command name, so `\cdot3x` becomes one unknown token and is
 * drawn as literal text. TeX ends a control word before a digit; insert that
 * space here before handing the string to hfmath.
 */
export declare const toHfmathLatex: (latex: string) => string;