Fix: Netlify edge deployment when using markdown (#3612)

* wip: revert sitemap PR

* fix: extract SSR-ready "slug" helper to separate module

* Un-revert sitemap PR. Not to blame!

This reverts commit 7cd2a8a5ea1e9fdee6837425881328928ceff852.

* fix: use .netlify for edge deployment test

* refactor: add md file to edge function fixture

* fix: add netlify edge tests to ci

* chore: remove stray console log

* wip: undo "dist" change on edge tests

* chore: changeset

* Revert "wip: undo "dist" change on edge tests"

This reverts commit 70e565ef06b228150547bca92bc12d1c236c0ed9.

* temp: add ignore to breaking edge tests

2 files changed, 8 insertions, 6 deletions

diff --git a/packages/markdown/remark/src/index.ts b/packages/markdown/remark/src/index.ts
index 817174e4c..9dfc0e38c 100644
--- a/packages/markdown/remark/src/index.ts
+++ b/packages/markdown/remark/src/index.ts
@@ -13,7 +13,6 @@ import scopedStyles from './remark-scoped-styles.js';
 import remarkShiki from './remark-shiki.js';
 import remarkUnwrap from './remark-unwrap.js';
 
-import Slugger from 'github-slugger';
 import rehypeRaw from 'rehype-raw';
 import rehypeStringify from 'rehype-stringify';
 import markdown from 'remark-parse';
@@ -26,11 +25,6 @@ export * from './types.js';
 export const DEFAULT_REMARK_PLUGINS = ['remark-gfm', 'remark-smartypants'];
 export const DEFAULT_REHYPE_PLUGINS = [];
 
-const slugger = new Slugger();
-export function slug(value: string): string {
-	return slugger.slug(value);
-}
-
 /** Shared utility for rendering markdown */
 export async function renderMarkdown(
 	content: string,
diff --git a/packages/markdown/remark/src/ssr-utils.ts b/packages/markdown/remark/src/ssr-utils.ts
new file mode 100644
index 000000000..1491e24a5
--- /dev/null
+++ b/packages/markdown/remark/src/ssr-utils.ts
@@ -0,0 +1,8 @@
+/** Utilities used in deployment-ready SSR bundles */
+import Slugger from 'github-slugger';
+
+const slugger = new Slugger();
+/** @see {@link "/packages/astro/vite-plugin-markdown"} */
+export function slug(value: string): string {
+	return slugger.slug(value);
+}