Delete source maps when source files are deleted in watch mode

CHANGELOG.md

@@ -3,6 +3,11 @@
 * Fix a bug where `@extend` rules loaded through a mixture of `@import` and
   `@use` rules could fail to apply correctly.
 
+### Command-Line Interface
+
+* In `--watch` mode, delete the source map when the associated source file is
+  deleted.
+
 ## 1.91.0
 
 * **Potentially breaking change:** `meta.inspect()` (as well as other systems

lib/src/executable/watch.dart

@@ -166,7 +166,10 @@ final class _Watcher {
     var url = _canonicalize(path);
 
     if (_graph.nodes.containsKey(url)) {
-      if (_destinationFor(path) case var destination?) _delete(destination);
+      if (_destinationFor(path) case var destination?) {
+        _delete(destination);
+        _delete("$destination.map");
+      }
     }
 
     var downstream = _graph.remove(FilesystemImporter.cwd, url);

pkg/sass_api/pubspec.yaml

@@ -10,7 +10,7 @@ environment:
   sdk: ">=3.6.0 <4.0.0"
 
 dependencies:
-  sass: 1.91.1
+  sass: 1.91.1-dev
 
 dev_dependencies:
   dartdoc: ^8.0.14

test/cli/shared/watch.dart

@@ -976,6 +976,29 @@ void sharedTests(Future<TestProcess> runSass(Iterable<String> arguments)) {
 
           await d.dir("dir", [d.nothing("out.css")]).validate();
         });
+
+        test("and deletes the source map", () async {
+          await d.file("test.scss", "a {b: c}").create();
+
+          var sass = await watch(["--source-map", "test.scss:out.css"]);
+          await expectLater(
+            sass.stdout,
+            emits(endsWith('Compiled test.scss to out.css.')),
+          );
+          await expectLater(sass.stdout, _watchingForChanges);
+          await tickIfPoll();
+
+          d.file("test.scss").io.deleteSync();
+          await expectLater(
+              sass.stdout,
+              emitsInOrder([
+                'Deleted out.css.',
+                'Deleted out.css.map.',
+              ]));
+          await sass.kill();
+
+          await d.nothing("out.css").validate();
+        });
       });
 
       test("creates a new CSS file when a Sass file is added", () async {