From b1c32e8c4c31d506df01d87669bcfbe8e2daab4c Mon Sep 17 00:00:00 2001
From: Anton Kudryavtsev <boblobl4@gmail.com>
Date: Sat, 2 May 2020 03:25:45 +0300
Subject: [PATCH] fix: remove <no source> from sourcemap

---
 src/loaders/postcss/index.ts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/loaders/postcss/index.ts b/src/loaders/postcss/index.ts
index c3d03f52..f45ab963 100644
--- a/src/loaders/postcss/index.ts
+++ b/src/loaders/postcss/index.ts
@@ -144,6 +144,13 @@ const loader: Loader<PostCSSLoaderOptions> = {
     for (const asset of assets) this.assets.set(asset.to, asset.source);
 
     map = mm((res.map?.toJSON() as unknown) as RawSourceMap)
+      .modify(m => {
+        // Remove "<no source>" if present
+        const noSource = m.sources?.indexOf("<no source>");
+        if (noSource === -1) return;
+        m.sources?.splice(noSource, 1);
+        m.sourcesContent?.splice(noSource, 1);
+      })
       .resolve(path.dirname(postcssOpts.to))
       .toString();