fix:fragment frontmatter is optional (#184)

* fix: make fragment frontmatter optional

* chore: lint fix

.changeset/polite-planes-shake.md

@@ -0,0 +1,5 @@
+---
+'@astrojs/compiler': patch
+---
+
+Fix bug when fragment parsing frontmatter is missing

internal/parser.go

@@ -2864,7 +2864,8 @@ func ParseFragmentWithOptions(r io.Reader, context *Node, opts ...ParseOption) (
 	}
 
 	var result []*Node
-	if p.fm.FirstChild != nil {
+
+	if p.fm != nil && p.fm.FirstChild != nil {
 		p.fm.Parent.RemoveChild(p.fm)
 		result = append(result, p.fm)
 	}

lib/compiler/test/empty-style.test.mjs

@@ -1,4 +1,5 @@
 /* eslint-disable no-console */
+/* eslint-disable @typescript-eslint/no-unused-vars */
 
 import { transform } from '@astrojs/compiler';
 import sass from 'sass';

lib/compiler/test/output.test.mjs

@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-unused-vars */
 /* eslint-disable no-console */
 import { transform } from '@astrojs/compiler';
 
@@ -12,7 +13,7 @@ async function run() {
       sourcefile: '/Users/matthew/dev/astro/packages/astro/test/fixtures/astro-attrs/src/pages/namespaced.astro',
       sourcemap: 'both',
       internalURL: 'astro/internal',
-      preprocessStyle: async (value, attrs) => {
+      preprocessStyle: async (_value, _attrs) => {
         return null;
       },
     }

lib/compiler/test/script-fragment.test.mjs

@@ -0,0 +1,18 @@
+/* eslint-disable no-console */
+
+import { transform } from '@astrojs/compiler';
+
+async function run() {
+  const result = await transform(`<script src={Astro.resolve("../scripts/no_hoist_nonmodule.js")}></script>`, {
+    sourcemap: true,
+    as: 'fragment',
+    site: undefined,
+    sourcefile: 'MoreMenu.astro',
+    sourcemap: 'both',
+    internalURL: 'astro/internal',
+  });
+
+  console.log(result.code);
+}
+
+await run();

lib/compiler/test/test.mjs

@@ -3,3 +3,4 @@ import './body-fragment.test.mjs';
 import './component-only.test.mjs';
 import './empty-style.test.mjs';
 import './output.test.mjs';
+import './script-fragment.test.mjs';

lib/compiler/test/visible.test.mjs

@@ -1,4 +1,6 @@
 /* eslint-disable no-console */
+/* eslint-disable no-unused-vars */
+/* eslint-disable @typescript-eslint/no-unused-vars */
 
 import { transform } from '@astrojs/compiler';