[MDX] Include `url` in glob result (#3981)

* deps: add es-module-lexer

* feat: inject url export on mdx files

* fix: apply url transform in prod

* test: page urls with overrides

* fix: revert test skips

* chore: changeset

* fix: add newline before export

1 files changed, 21 insertions, 0 deletions

diff --git a/packages/integrations/mdx/src/utils.ts b/packages/integrations/mdx/src/utils.ts
new file mode 100644
index 000000000..1091e8511
--- /dev/null
+++ b/packages/integrations/mdx/src/utils.ts
@@ -0,0 +1,21 @@
+import type { AstroConfig } from 'astro';
+
+function appendForwardSlash(path: string) {
+	return path.endsWith('/') ? path : path + '/';
+}
+
+/** @see 'vite-plugin-utils' for source */
+export function getFileInfo(id: string, config: AstroConfig) {
+	const sitePathname = appendForwardSlash(
+		config.site ? new URL(config.base, config.site).pathname : config.base
+	);
+
+	const fileId = id.split('?')[0];
+	let fileUrl = fileId.includes('/pages/')
+		? fileId.replace(/^.*?\/pages\//, sitePathname).replace(/(\/index)?\.mdx$/, '')
+		: undefined;
+	if (fileUrl && config.trailingSlash === 'always') {
+		fileUrl = appendForwardSlash(fileUrl);
+	}
+	return { fileId, fileUrl };
+}