fix: speed up build by ensuring stable cache

apps/svelte.dev/content/tutorial/03-sveltekit/02-routing/01-pages/index.md

@@ -2,7 +2,7 @@
 title: Pages
 ---
 
-SvelteKit uses filesystem-based routing, which means that the _routes_ of your app — in other words, what the app should do when a user navigates to a particular URL — are defined by the directories in your codebase.
+SvelteKit uses x filesystem-based routing, which means that the _routes_ of your app — in other words, what the app should do when a user navigates to a particular URL — are defined by the directories in your codebase.
 
 Every `+page.svelte` file inside `src/routes` creates a page in your app. In this app we currently have one page — `src/routes/+page.svelte`, which maps to `/`. If we navigate to `/about`, we'll see a 404 Not Found error.
 

packages/site-kit/src/lib/markdown/renderer.ts

@@ -1,6 +1,7 @@
 import MagicString from 'magic-string';
 import { createHash, Hash } from 'node:crypto';
 import fs from 'node:fs';
+import process from 'node:process';
 import path from 'node:path';
 import ts from 'typescript';
 import * as marked from 'marked';
@@ -28,9 +29,21 @@ const theme = createCssVariablesTheme({
 	fontStyle: true
 });
 
+// Hash the contents of this file and its dependencies so that we get a new cache in case we have changed
+// how the markdown is rendered (whose logic live here). This is to avoid serving stale code snippets.
 const hash = createHash('sha256');
 hash.update(fs.readFileSync('../../pnpm-lock.yaml', 'utf-8'));
-hash_graph(hash, fileURLToPath(import.meta.url));
+// CAREFUL: update this URL in case you ever move this file or start the dev/build process from another directory
+const original_file = '../../packages/site-kit/src/lib/markdown/renderer.ts';
+if (!fs.existsSync(original_file)) {
+	throw new Error(
+		'Update the path to the markdown renderer code. Current value: ' +
+			original_file +
+			' | Current cwd: ' +
+			process.cwd()
+	);
+}
+hash_graph(hash, original_file);
 const digest = hash.digest().toString('base64').replace(/\//g, '-');
 
 /**