fix: correctly handle MDX layouts (#6845)

* fix: correctly handle MDX layouts (#6844)

* fix: adjust JSXNode return value (#6844)

* refactor(mdx): use jsx instead of internals

---------

Co-authored-by: Wout Mertens <[email protected]>

Author: danielvaijk

.changeset/lazy-worms-attack.md

@@ -0,0 +1,5 @@
+---
+'@builder.io/qwik-city': patch
+---
+
+MDX content no longer ignores Layout components. See [the MDX docs](https://mdxjs.com/docs/using-mdx/#layout) for more information.

.changeset/real-garlics-argue.md

@@ -0,0 +1,5 @@
+---
+'@builder.io/qwik-city': patch
+---
+
+Fixed MDX layout default export being ignored by transformer.

packages/qwik-city/src/buildtime/markdown/mdx.ts

@@ -4,7 +4,6 @@ import { rehypeSyntaxHighlight } from './syntax-highlight';
 import type { BuildContext } from '../types';
 import { parseFrontmatter } from './frontmatter';
 import { getExtension } from '../../utils/fs';
-import { createHash } from 'node:crypto';
 import type { CompileOptions } from '@mdx-js/mdx';
 
 export async function createMdxTransformer(ctx: BuildContext): Promise<MdxTransform> {
@@ -70,17 +69,11 @@ export async function createMdxTransformer(ctx: BuildContext): Promise<MdxTransf
       const file = new VFile({ value: code, path: id });
       const compiled = await compile(file, options);
       const output = String(compiled.value);
-      const hasher = createHash('sha256');
-      const key = hasher
-        .update(output)
-        .digest('base64')
-        .slice(0, 8)
-        .replace('+', '-')
-        .replace('/', '_');
-      const addImport = `import { _jsxC, RenderOnce } from '@builder.io/qwik';\n`;
+      const addImport = `import { jsx } from '@builder.io/qwik';\n`;
       const newDefault = `
 const WrappedMdxContent = () => {
-  return _jsxC(RenderOnce, {children: _jsxC(_createMdxContent, {}, 3, null)}, 3, ${JSON.stringify(key)});
+  const content = _createMdxContent({});
+  return typeof MDXLayout === 'function' ? jsx(MDXLayout, {children: content}) : content;
 };
 export default WrappedMdxContent;
 `;

packages/qwik-city/src/buildtime/markdown/mdx.unit.ts

@@ -1,29 +1,32 @@
 import { describe, expect, test } from 'vitest';
 import { createMdxTransformer } from './mdx';
 
-describe('mdx', () => {
-  test('convert mdx', async () => {
-    const ctx = {
-      frontmatter: new Map(),
-      opts: {
-        mdx: {
-          remarkPlugins: [],
-          rehypePlugins: [],
-        },
-        mdxPlugins: {},
+// It could be that new MDX versions change the output used for snapshot matching. Change as needed.
+describe('mdx', async () => {
+  const ctx = {
+    frontmatter: new Map(),
+    opts: {
+      mdx: {
+        remarkPlugins: [],
+        rehypePlugins: [],
       },
-    };
-    const transformer = await createMdxTransformer(ctx as any);
+      mdxPlugins: {},
+    },
+  };
+
+  const transformer = await createMdxTransformer(ctx as any);
+
+  test('convert flat mdx', async () => {
     const mdx = `
 # Hello
 <a href="http://example.com">Hello</a>
 <div>World</div>
 `;
     const result = await transformer(mdx, 'file.mdx');
-    // It could be that new mdx versions change this output, make sure it still makes sense
+
     expect(result).toMatchInlineSnapshot(`
       {
-        "code": "import { _jsxC, RenderOnce } from '@builder.io/qwik';
+        "code": "import { jsx } from '@builder.io/qwik';
       import {Fragment as _Fragment, jsx as _jsx, jsxs as _jsxs} from "@builder.io/qwik/jsx-runtime";
       export const headings = [{
         "text": "Hello",
@@ -59,7 +62,8 @@ describe('mdx', () => {
       }
 
       const WrappedMdxContent = () => {
-        return _jsxC(RenderOnce, {children: _jsxC(_createMdxContent, {}, 3, null)}, 3, "eB2HIyA1");
+        const content = _createMdxContent({});
+        return typeof MDXLayout === 'function' ? jsx(MDXLayout, {children: content}) : content;
       };
       export default WrappedMdxContent;
       ",
@@ -75,4 +79,81 @@ describe('mdx', () => {
       }
     `);
   });
+
+  test('convert layout mdx', async () => {
+    const mdx = `
+# Hello
+
+export default function Layout({ children: content }) {
+  return <main>{content}</main>;
+}
+
+<a href="http://example.com">Hello</a>
+<div>World</div>
+`;
+    const result = await transformer(mdx, 'file.mdx');
+
+    expect(result).toMatchInlineSnapshot(`
+      {
+        "code": "import { jsx } from '@builder.io/qwik';
+      import {Fragment as _Fragment, jsx as _jsx, jsxs as _jsxs} from "@builder.io/qwik/jsx-runtime";
+      export const headings = [{
+        "text": "Hello",
+        "id": "hello",
+        "level": 1
+      }];
+      export const frontmatter = undefined;
+      const MDXLayout = function Layout({children: content}) {
+        return _jsx("main", {
+          children: content
+        });
+      };
+      function _createMdxContent(props) {
+        const _components = {
+          a: "a",
+          h1: "h1",
+          span: "span",
+          ...props.components
+        };
+        return _jsxs(_Fragment, {
+          children: [_jsxs(_components.h1, {
+            id: "hello",
+            children: [_jsx(_components.a, {
+              "aria-hidden": "true",
+              tabindex: "-1",
+              href: "#hello",
+              children: _jsx(_components.span, {
+                class: "icon icon-link"
+              })
+            }), "Hello"]
+          }), "\\n", "\\n", _jsx("a", {
+            href: "http://example.com",
+            children: "Hello"
+          }), "\\n", _jsx("div", {
+            children: "World"
+          })]
+        });
+      }
+
+      const WrappedMdxContent = () => {
+        const content = _createMdxContent({});
+        return typeof MDXLayout === 'function' ? jsx(MDXLayout, {children: content}) : content;
+      };
+      export default WrappedMdxContent;
+      ",
+        "map": {
+          "file": "file.mdx",
+          "mappings": ";;;;;;;kBAGe,iBAAkBA,UAAUC;cACjC;cAAMA;;;;;;;;;;;;;;;;;;;;UAHd;;;gBAM2B;;gBACxB",
+          "names": [
+            "children",
+            "content",
+          ],
+          "sources": [
+            "file.mdx",
+          ],
+          "version": 3,
+        },
+      }
+    `);
+  });
 });