fix: bundle client-side code for components used in .md pages (#78)

.gitignore

@@ -3,3 +3,4 @@ lib/
 dist/
 *.tsbuildinfo
 .DS_Store
+test/fixtures/*/_site/

src/build/bundle.ts

@@ -8,6 +8,7 @@ import esbuild from 'esbuild';
 import { promises as fsPromises } from 'fs';
 import { parse } from '../parser/index.js';
 import { transform } from '../compiler/transform/index.js';
+import { convertMdToAstroSource } from '../compiler/index.js';
 import { getAttrValue } from '../ast.js';
 import { walk } from 'estree-walker';
 import babelParser from '@babel/parser';
@@ -72,12 +73,17 @@ export async function collectDynamicImports(filename: URL, { astroConfig, loggin
   const imports = new Set<string>();
 
   // Only astro files
-  if (!filename.pathname.endsWith('astro')) {
+  if (!filename.pathname.endsWith('.astro') && !filename.pathname.endsWith('.md')) {
     return imports;
   }
 
   const extensions = astroConfig.extensions || defaultExtensions;
-  const source = await readFile(filename, 'utf-8');
+
+  let source = await readFile(filename, 'utf-8');
+  if (filename.pathname.endsWith('.md')) {
+    source = await convertMdToAstroSource(source);
+  }
+
   const ast = parse(source, {
     filename,
   });

src/compiler/index.ts

@@ -48,13 +48,9 @@ async function convertAstroToJsx(template: string, opts: ConvertAstroOptions): P
 }
 
 /**
- * .md -> .jsx
- * Core function processing Markdown, but along the way also calls convertAstroToJsx().
+ * .md -> .astro source
  */
-async function convertMdToJsx(
-  contents: string,
-  { compileOptions, filename, fileID }: { compileOptions: CompileOptions; filename: string; fileID: string }
-): Promise<TransformResult> {
+export async function convertMdToAstroSource(contents: string): Promise<string> {
   const { data: frontmatterData, content } = matter(contents);
   const { headers, headersExtension } = createMarkdownHeadersCollector();
   const { htmlAstro, mdAstro } = encodeAstroMdx();
@@ -80,15 +76,24 @@ async function convertMdToJsx(
   // Break it up here so that the HTML parser won't detect it.
   const stringifiedSetupContext = JSON.stringify(contentData).replace(/\<\/script\>/g, `</scrip" + "t>`);
 
-  const raw = `---
+  return `---
   ${imports}
   ${frontmatterData.layout ? `import {__renderPage as __layout} from '${frontmatterData.layout}';` : 'const __layout = undefined;'}
   export const __content = ${stringifiedSetupContext};
 ---
 <section>${mdHtml}</section>`;
+}
 
+/**
+ * .md -> .jsx
+ * Core function processing Markdown, but along the way also calls convertAstroToJsx().
+ */
+async function convertMdToJsx(
+  contents: string,
+  { compileOptions, filename, fileID }: { compileOptions: CompileOptions; filename: string; fileID: string }
+): Promise<TransformResult> {
+  const raw = await convertMdToAstroSource(contents);
   const convertOptions = { compileOptions, filename, fileID };
-
   return await convertAstroToJsx(raw, convertOptions);
 }
 

test/astro-markdown.test.js

@@ -1,15 +1,22 @@
+import { existsSync, promises as fsPromises } from 'fs';
+import { join } from 'path';
 import { suite } from 'uvu';
 import * as assert from 'uvu/assert';
 import { createRuntime } from '../lib/runtime.js';
+import { build } from '../lib/build.js';
 import { loadConfig } from '../lib/config.js';
 import { doc } from './test-utils.js';
 
+const { rmdir, readFile } = fsPromises;
+
 const Markdown = suite('Astro Markdown');
 
-let runtime, setupError;
+let runtime, setupError, fixturePath, astroConfig;
 
 Markdown.before(async () => {
-  const astroConfig = await loadConfig(new URL('./fixtures/astro-markdown', import.meta.url).pathname);
+  fixturePath = new URL('./fixtures/astro-markdown', import.meta.url).pathname;
+
+  astroConfig = await loadConfig(fixturePath);
 
   const logging = {
     level: 'error',
@@ -26,6 +33,7 @@ Markdown.before(async () => {
 
 Markdown.after(async () => {
   (await runtime) && runtime.shutdown();
+  rmdir(join(fixturePath, '_site'), { recursive: true });
 });
 
 Markdown('No errors creating a runtime', () => {
@@ -50,4 +58,13 @@ Markdown('Can load more complex jsxy stuff', async () => {
   assert.equal($el.text(), 'Hello world');
 });
 
+Markdown('Bundles client-side JS for prod', async () => {
+  await build(astroConfig);
+
+  const complexHtml = await readFile(join(fixturePath, './_site/complex/index.html'), 'utf-8');
+
+  assert.match(complexHtml, `import("/_astro/components/Counter.js"`);
+  assert.ok(existsSync(join(fixturePath, `./_site/_astro/components/Counter.js`)), 'Counter.jsx is bundled for prod');
+});
+
 Markdown.run();

test/fixtures/astro-markdown/astro/components/Counter.jsx

@@ -0,0 +1,7 @@
+import { h } from 'preact';
+import { useState } from 'preact/hooks';
+
+export default function () {
+  const [count, setCount] = useState(0);
+  return <button onClick={() => setCount(count + 1)}>{count}</button>;
+}

test/fixtures/astro-markdown/astro/pages/complex.md

@@ -4,8 +4,10 @@ title: My Blog Post
 description: This is a post about some stuff.
 import:
   Hello: '../components/Hello.jsx'
+  Counter: '../components/Counter.jsx'
 ---
 
 ## Interesting Topic
 
 <Hello name={`world`} />
+<Counter:load />

test/fixtures/astro-markdown/astro/pages/index.astro

@@ -1,14 +0,0 @@
----
-  export function setup() {
-    return {props: {}}
-  }
----
-
-<html>
-  <head>
-    <!-- Head Stuff -->
-  </head>
-  <body>
-    <h1>Hello world!</h1>
-  </body>
-</html>