From 00fb8bb9196c118ac508d4b4d25493a87f79adba Mon Sep 17 00:00:00 2001
From: Princesseuh <3019731+Princesseuh@users.noreply.github.com>
Date: Fri, 28 Nov 2025 06:21:00 +0100
Subject: [PATCH] fix(environment): Prevent Vite from interpreting injected
 sourcemap comments as actual sourcemaps

---
 packages/astro/src/vite-plugin-astro/index.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/packages/astro/src/vite-plugin-astro/index.ts b/packages/astro/src/vite-plugin-astro/index.ts
index 95ce6ad00720..a783b4f3bb21 100644
--- a/packages/astro/src/vite-plugin-astro/index.ts
+++ b/packages/astro/src/vite-plugin-astro/index.ts
@@ -293,7 +293,9 @@ export default function astro({ settings, logger }: AstroPluginOptions): vite.Pl
 
 function appendSourceMap(content: string, map?: string) {
 	if (!map) return content;
-	return `${content}\n//# sourceMappingURL=data:application/json;charset=utf-8;base64,${Buffer.from(
+	// The \n here is on purpose inside a template literal because otherwise, in the final built version of this file, the comment would
+	// start on its own line, and some tools will think it's actually the sourcemap of this file, not of generated code.
+	return `${content}${'\n'}//# sourceMappingURL=data:application/json;charset=utf-8;base64,${Buffer.from(
 		map,
 	).toString('base64')}`;
 }