How to access MathJax

[zcysxy]

Sorry I am not very familiar with web development. I want to configure MathJax following the official document like the following example

However, it requires to access MathJax within the configure. I tried the following code

const markdownIt = require("markdown-it");
const mathjax = require("markdown-it-mathjax3");

let markdownLib = markdownIt({
  breaks: true,
  html: true,
})
  .use(require("markdown-it-mathjax3"), {
    tex: {
      inlineMath: [["$", "$"]],
    },
    options: {
      skipHtmlTags: { "[-]": ["pre"] },
    },
    startup: {
      ready: () => {
        mathjax.startup.defaultReady();
        mathjax.tex2chtml('\\def\\R{\\mathbb{R}}');
        console.log('hi mathjax');
      }
    }
  })

But it does not seem to work. Thanks!

[zcysxy]

The use case is that I want to render some TeX commands at startup, e.g., defining some macros like \def\R{\mathbb{R}} for every document.

[bill-ion]

If you read the source code of this plugin, you will find that it only receive tex option and svg option. So the answer is simply that the startup option is not supported so far.

function plugin(md: MarkdownIt, options: any) {
  // Default options

  const documentOptions = {
    InputJax: new TeX({ packages: AllPackages,  ...options?.tex }),
    OutputJax: new SVG({ fontCache: 'none',  ...options?.svg })
  }
  const convertOptions = {
    display: false
  }

  // set MathJax as the renderer for markdown-it-simplemath
  md.inline.ruler.after("escape", "math_inline", math_inline);
  md.block.ruler.after("blockquote", "math_block", math_block, {
    alt: ["paragraph", "reference", "blockquote", "list"],
  });
  md.renderer.rules.math_inline = function (tokens: Token[], idx: number) {
    convertOptions.display = false;
    return renderMath(tokens[idx].content, documentOptions, convertOptions)
  };
  md.renderer.rules.math_block = function (tokens: Token[], idx: number) {
    convertOptions.display = true;
    return renderMath(tokens[idx].content, documentOptions, convertOptions)
  };
};