From 3c9a7ea94e63c6b047e1a958369c121625e13064 Mon Sep 17 00:00:00 2001
From: Ben McCann <322311+benmccann@users.noreply.github.com>
Date: Sun, 25 Jul 2021 10:32:48 -0700
Subject: [PATCH] Revert "[fix] add filename to combined source map if needed
 (#6089)"

This reverts commit 4ca2af41df436ef97cd1953eb67c2c4922a8257b.
---
 src/compiler/utils/mapped_code.ts                      | 5 -----
 test/sourcemaps/samples/preprocessed-no-map/_config.js | 2 +-
 2 files changed, 1 insertion(+), 6 deletions(-)

diff --git a/src/compiler/utils/mapped_code.ts b/src/compiler/utils/mapped_code.ts
index 58f44d7b8c9f..12a3ce1d162a 100644
--- a/src/compiler/utils/mapped_code.ts
+++ b/src/compiler/utils/mapped_code.ts
@@ -251,11 +251,6 @@ export function combine_sourcemaps(
 
 	if (!map.file) delete map.file; // skip optional field `file`
 
-	// When source maps are combined and the leading map is empty, sources is not set.
-	// Add the filename to the empty array in this case. 
-	// Further improvements to remapping may help address this as well https://github.com/ampproject/remapping/issues/116
-	if (!map.sources.length) map.sources = [filename];
-
 	return map;
 }
 
diff --git a/test/sourcemaps/samples/preprocessed-no-map/_config.js b/test/sourcemaps/samples/preprocessed-no-map/_config.js
index 78b0ee626f2a..9888b56ddf8f 100644
--- a/test/sourcemaps/samples/preprocessed-no-map/_config.js
+++ b/test/sourcemaps/samples/preprocessed-no-map/_config.js
@@ -1,5 +1,5 @@
 export default {
-	css_map_sources: ['input.svelte'],
+	css_map_sources: [],
 	preprocess: [
 		{
 			style: ({ content }) => {