Is there a way to include KaTeX extensions? (mhchem extension)

[vedranmiletic]

I looked into katexOption but I don't see how would I use it for adding mhcem. It requires an inclusion of extra script:

<script defer src="https://cdn.jsdelivr.net/npm/katex@0.13.3/dist/contrib/mhchem.min.js" integrity="sha384-LIgAiYlGSAdpNC9+YDjDPF6JeS/RRIumtNo0CmyQERZ/+g0h9MbuYQwf/5pQ4Y4M"  crossorigin="anonymous"></script>

I also tried using MathJax, but it also requires specifying mhchem as an extension.

[yhatt]

Marp's markdown rendering will be completed within Node.js. <script> is for browser side so will never work. Instead, you should follow KaTeX documentation for Node.js: https://github.com/KaTeX/KaTeX/blob/master/docs/node.md#using-mhchem-extension

In Marp CLI:

// marp.config.js
const katex = require('katex');
require('katex/dist/contrib/mhchem.js'); // modify katex module

To modify Marp Core's KaTeX, you may be required installing into local.

npm i @marp-team/marp-core @marp-team/marp-cli
npx marp -c marp.config.js your-markdown.md

[Serenade600]

Marp's markdown rendering will be completed within Node.js. <script> is for browser side so will never work. Instead, you should follow KaTeX documentation for Node.js: https://github.com/KaTeX/KaTeX/blob/master/docs/node.md#using-mhchem-extension

In Marp CLI:

// marp.config.js
const katex = require('katex');
require('katex/dist/contrib/mhchem.js'); // modify katex module

To modify Marp Core's KaTeX, you may be required installing into local.

npm i @marp-team/marp-core @marp-team/marp-cli
npx marp -c marp.config.js your-markdown.md

As a complete newbie I am, so the solution also fits to marp for VS-code, right?

[yhatt]

No, it works only in Marp CLI for now. We disallow custom configuration in VS Code due to potentially security risk: marp-team/marp-vscode#194