svelte.config.js

import staticAdapter from '@sveltejs/adapter-static';
import vercelAdapter from '@sveltejs/adapter-vercel';

import { vitePreprocess } from '@sveltejs/vite-plugin-svelte';

import { mdsvex, escapeSvelte } from 'mdsvex';
import unwrapImages from 'rehype-unwrap-images';
import slug from 'rehype-slug';
import gfm from 'remark-gfm';
import { codeToHtml, bundledLanguages } from 'shiki';

import { processCallouts } from './plugins/svelte-compile-callouts.js';
import { processImages } from './plugins/svelte-enhance-images.js';
import { fixMarkdownUrls } from './plugins/remark-fix-urls.js';

/** @type {import('mdsvex').MdsvexOptions} */
const mdsvexOptions = {
	extensions: ['.md'],
	remarkPlugins: [unwrapImages, fixMarkdownUrls, gfm],
	rehypePlugins: [slug],
	layout: {
		_: './src/lib/markdown/base.svelte',
		page: './src/lib/markdown/page.svelte',
		contents: './src/lib/markdown/contents/contents.svelte',
	},
	highlight: {
		highlighter: async (code, lang = 'text') => {
			if (!bundledLanguages[lang]) return code;
			const html = escapeSvelte(await codeToHtml(code, { lang, theme: 'night-owl' }));
			return `{@html \`${html}\` }`;
		},
	},
};

/** @type {import('@sveltejs/kit').Config} */
const config = {
	extensions: ['.svelte', '.md'],
	preprocess: [vitePreprocess(), mdsvex(mdsvexOptions), processImages(), processCallouts()],
	kit: {
		adapter: process.env.VERCEL ? vercelAdapter() : staticAdapter({ strict: false }),
		alias: {
			'@/*': 'src/*',
			'$lib/*': 'src/lib/*',
			'$assets/*': 'src/assets/*',
			'$courses/*': 'content/courses/*',
			'content/*': 'content/*',
			$merge: 'src/lib/merge.ts',
		},
	},
};

export default config;