import type { MathRender } from './types.js';
export declare function isMathReady(): boolean;
export declare function onMathReady(fn: () => void): () => void;
/**
 * Load MathJax and start the TeX → SVG converter. Await it before laying
 * out a document with `$…$` / `$$…$$` on the main thread (the layout worker
 * calls it itself): until it resolves, every formula is set as a grey
 * placeholder box. Idempotent; a failed start can be retried.
 */
export declare function initMathEngine(): Promise<void>;
/**
 * Called when the layout sets a formula with no engine running, so it gets a
 * grey placeholder box. Warns once, and only when nobody asked for the
 * engine: a host that lays out now and again from `onMathReady` has
 * `initMathEngine` in flight and expects the placeholders.
 */
export declare function noteMathWithoutEngine(): void;
export interface RenderOptions {
    /** Body line-box in px. Inline math is scaled down to fit. Display math
     *  is not clamped. */
    lineBoxPx?: number;
    /** Override the default colour (MathJax emits "currentColor" which is a
     *  CSS construct; we substitute here so the SVG is self-contained). */
    color?: string;
    /** Display math: the width of the measure the formula is set in, in px.
     *  A numbered equation (`\tag{…}`) takes this width, the equation
     *  centred and its number flush right; without it, it takes the least
     *  width that holds both. Other formulas keep their own width. */
    containerWidthPx?: number;
}
/**
 * Typeset TeX as SVG at `fontSizePx`: one em of the formula is
 * `fontSizePx` (MathJax sizes in `ex`, the TeX font's x-height, 0.442 em).
 * Cached; before {@link initMathEngine} resolves it returns a placeholder
 * box instead (not cached).
 */
export declare function renderMath(tex: string, displayMode: boolean, fontSizePx: number, options?: RenderOptions): MathRender;
export declare function placeholderRender(tex: string, displayMode: boolean, fontSizePx: number): MathRender;
export declare function clearMathCache(): void;
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