Tighten @astrojs/mdx peer dependency on astro and improve version mismatch error message

.changeset/tasty-waves-film.md

@@ -0,0 +1,5 @@
+---
+'@astrojs/mdx': patch
+---
+
+Fixes an incompatibility where `@astrojs/mdx` v8 could be installed with `astro` versions that bundle an older `@astrojs/markdown-satteri` lacking MDX support. Also improves the error message when the processor is too old to suggest updating `astro` itself.

packages/integrations/mdx/package.json

@@ -41,7 +41,7 @@
   "peerDependencies": {
     "@astrojs/markdown-remark": "^7.3.0",
     "@astrojs/markdown-satteri": "^0.4.0",
-    "astro": "^7.2.6"
+    "astro": "^7.2.10"
   },
   "peerDependenciesMeta": {
     "@astrojs/markdown-remark": {

packages/integrations/mdx/src/vite-plugin-mdx.ts

@@ -100,7 +100,7 @@ const BUILT_IN_PROCESSOR_PACKAGES: Record<string, string> = {
 function mdxUnsupportedMessage(name: string): string {
 	const pkg = BUILT_IN_PROCESSOR_PACKAGES[name];
 	if (pkg) {
-		return `\`${pkg}\` is too old to render \`.mdx\` files. Update it to the latest version — a \`^\` range on an older version will not pick it up:\n  npm install ${pkg}@latest`;
+		return `\`${pkg}\` is too old to render \`.mdx\` files. Update \`astro\` (which bundles it) and the processor package to the latest version:\n  npm install astro@latest ${pkg}@latest`;
 	}
 	return `The markdown processor "${name}" does not provide MDX support. Implement \`createMdxRenderer\` on the processor to enable MDX rendering.`;
 }