export type RegexReplacer = (substring: string, ...args: any[]) => string;
export interface SlimdownRenderHookInput {
    /** Escape text for safe HTML text-node output. */
    escapeHtml: (value: string) => string;
}
export interface SlimdownCodeBlockInput extends SlimdownRenderHookInput {
    lang: string;
    code: string;
}
export interface SlimdownMathInput extends SlimdownRenderHookInput {
    math: string;
}
export interface SlimdownExtension {
    /**
     * Render a fenced code block. Return undefined to let the next extension or
     * the built-in renderer handle it.
     */
    renderCodeBlock?: (input: SlimdownCodeBlockInput) => string | undefined;
    /** Render a block math expression captured from $$...$$. */
    renderMathBlock?: (input: SlimdownMathInput) => string | undefined;
    /** Render an inline math expression captured from $...$. */
    renderInlineMath?: (input: SlimdownMathInput) => string | undefined;
}
export declare const escapeHtml: (s: string) => string;
/** Options for the {@link render} function. */
export interface RenderOptions {
    /** If true, remove the `<p>...</p>` wrapper around top-level paragraphs. Default: false. */
    removeParagraphs?: boolean;
    /** If true, add `target="_blank"` to all links. Default: false. */
    externalLinks?: boolean;
    /** If true, parse alpha ordered lists such as `a.`, `A)`, or `(b)`. Default: false. */
    alphaLists?: boolean;
    /** If true, add a slugified `id` attribute to each heading. Default: false. */
    headingIds?: boolean;
    /** Optional render hooks for code blocks and math placeholders. */
    extensions?: SlimdownExtension[];
}
/**
 * Render Markdown text into HTML.
 *
 * @param markdown Markdown text
 * @param optionsOrRemoveParagraphs Either a {@link RenderOptions} object, or a boolean to remove
 * the `<p>` wrapper around paragraphs (legacy positional form).
 * @param externalLinks If true (default false), add `target="_blank"` to all links.
 * Only used when the second argument is a boolean (legacy form).
 */
export declare function render(markdown: string, options?: RenderOptions): string;
export declare function render(markdown: string, removeParagraphs?: boolean, externalLinks?: boolean): string;
/**
 * Add a new rule: The regex should be global and not use multiline mode.
 */
export declare const addRule: (regex: RegExp, replacement: RegexReplacer | string) => void;