Example using pHTML and Svelte

config.js

/** Example using phtml-markdown
https://github.com/phtmlorg/phtml-markdown **/

// svelt-preprocessor
const options = {
    phtml ({ content, filename }) {
		return phtmlMarkdown.process(content, { from: filename }).then(result => ({ code: result.html, map: null }));
	}
}

// svelte
const processed = await svelte.preprocess(source, {
    markup: ({ content }) => phtmlMarkdown.process(content).then(result => ({ code: result.html }))
});