Does no load source map file without opts.from

ai · ai · commit 7beca139e70f · 2026-07-24T16:59:19.000Z
diff --git a/lib/previous-map.js b/lib/previous-map.js
@@ -86,19 +86,13 @@ class PreviousMap {
 
   loadFile(path, cssFile, trusted) {
     if (!trusted && !this.unsafeMap) {
-      if (!/\.map$/i.test(path)) {
+      if (!/\.map$/i.test(path)) return undefined
+      if (!cssFile) return undefined
+
+      let rel = relative(dirname(cssFile), path)
+      if (rel === '..' || rel.startsWith('..' + sep) || isAbsolute(rel)) {
         return undefined
       }
-      if (cssFile) {
-        let relativePath = relative(dirname(cssFile), path)
-        if (
-          relativePath === '..' ||
-          relativePath.startsWith('..' + sep) ||
-          isAbsolute(relativePath)
-        ) {
-          return undefined
-        }
-      }
     }
     this.root = dirname(path)
     if (existsSync(path)) {
diff --git a/test/previous-map.test.ts b/test/previous-map.test.ts
@@ -313,6 +313,21 @@ test('does not load map from outside the from folder', () => {
   type(input?.map, 'undefined')
 })
 
+test('does not load relative map without from', () => {
+  let cwd = join(dir, 'subdir')
+  mkdirSync(dir)
+  mkdirSync(cwd)
+  writeFileSync(join(cwd, 'previous.map'), map)
+  let previousCwd = process.cwd()
+  try {
+    process.chdir(cwd)
+    let input = parse('a{}\n/*# sourceMappingURL=previous.map */').source?.input
+    type(input?.map, 'undefined')
+  } finally {
+    process.chdir(previousCwd)
+  }
+})
+
 test('loads map from outside the from folder with unsafeMap', () => {
   let from = join(dir, 'subdir', 'a.css')
   mkdirSync(dir)
