how to use label (and equation numbers) in math equations (mathjax3)

[lazarusA]

is mathjax3 supposed to work with things like ?

This is a simple 

$$x=0\label{eq:a}$$

so that now I can reference this as $\eqref{eq:a}$. Right? 

and should render a number to the right, which is the tag for that equation. But some reason I don't seem to get it to work.

In my config.mts file I have:

import mathjax3 from "markdown-it-mathjax3";

export default defineConfig({
markdown: {
    math: true,
    config(md) {
      md.use(mathjax3, { tex: { tags: 'ams' } }),
    },
  },
})

[brc-dd]

that will register the plugin twice, do something like this and remove config(md) part

math: { tex: { tags: 'ams' } }

but I don't think it works reliably in that plugin (#4740)

[lazarusA]

same output, unfortunately 😢 . And the proposed solution from the above link didn't work for me, possible outdated 😢

[brc-dd]

It should be something like this:

This is a simple

$$
\begin{equation}
x=0 \label{eq:a}
\end{equation}
$$

so that now I can reference this as $\eqref{eq:a}$. Right?

https://stackblitz.com/edit/vite-lhdnrmuz?file=docs/.vitepress/config.ts,docs/.vitepress/theme/index.ts,docs/index.md

Not sure if it's possible to write without equation environment, because your syntax will need passing the leading and trailing $$ to mathjax too, but the plugins usually only pass the content.

[lazarusA]

Ok, this test project seems to work. I will try to incorporate it in my project. Although, it would be nice to have a solution for mathjax3, since is the most widely used and recommended, https://vitepress.dev/guide/markdown#math-equations.

Thanks.