Tags

You can use Svelte components for tags, the same way you do for nodes.

Create a Svelte file and export Svelte components with the same name as the node from the module context.

./src/lib/Tags.svelte
<script context="module">
    export { default as Multiply } from './Multiply.svelte';
</script>
svelte.config.js
import { dirname, join } from 'path';
import { fileURLToPath } from 'url';

markdoc({
    tags: join(
        dirname(fileURLToPath(import.meta.url)),
        './src/lib/Tags.svelte',
    ),
});
./src/lib/Multiply.svelte
<script>
    export let a;
    export let b;
</script>

<p>{a} * {b} = {a * b}</p>
./src/routes/+page.markdoc
# I am in a markdoc file

{% multiply a=2 b=3 /%}