Reformat with the latest formatter

lib/src/callable/async_built_in.dart

@@ -11,7 +11,7 @@ import '../value.dart';
 import 'async.dart';
 
 /// An [AsyncBuiltInCallable]'s callback.
-typedef FutureOr<Value> _Callback(List<Value> arguments);
+typedef _Callback = FutureOr<Value> Function(List<Value> arguments);
 
 /// A callable defined in Dart code.
 ///

lib/src/callable/built_in.dart

@@ -9,7 +9,7 @@ import '../callable.dart';
 import '../value.dart';
 import 'async_built_in.dart';
 
-typedef Value _Callback(List<Value> arguments);
+typedef _Callback = Value Function(List<Value> arguments);
 
 /// A callable defined in Dart code.
 ///

lib/src/visitor/async_evaluate.dart

@@ -42,7 +42,7 @@ import 'interface/modifiable_css.dart';
 import 'interface/statement.dart';
 
 /// A function that takes a callback with no arguments.
-typedef Future _ScopeCallback(Future callback());
+typedef _ScopeCallback = Future Function(Future Function() callback);
 
 /// Converts [stylesheet] to a plain CSS tree.
 ///

lib/src/visitor/evaluate.dart

@@ -5,7 +5,7 @@
 // DO NOT EDIT. This file was generated from async_evaluate.dart.
 // See tool/grind/synchronize.dart for details.
 //
-// Checksum: ef520a902171c8d105ece12e7c84889e34f95d80
+// Checksum: c41c933bbae5af96a77e39cea8c4d7a4c86cb564
 //
 // ignore_for_file: unused_import
 
@@ -51,7 +51,7 @@ import 'interface/modifiable_css.dart';
 import 'interface/statement.dart';
 
 /// A function that takes a callback with no arguments.
-typedef void _ScopeCallback(void callback());
+typedef _ScopeCallback = void Function(void Function() callback);
 
 /// Converts [stylesheet] to a plain CSS tree.
 ///

test/source_map_test.dart

@@ -808,7 +808,7 @@ void _expectMapMatches(
 
     if (!entryIter.moveNext()) {
       fail('Missing mapping "$name", expected '
-          '${_mapping(expectedSource, expectedTarget)}.\n' +
+              '${_mapping(expectedSource, expectedTarget)}.\n' +
           actualMap());
     }
 
@@ -818,7 +818,7 @@ void _expectMapMatches(
         expectedTarget.line != entry.target.line ||
         expectedTarget.column != entry.target.column) {
       fail('Mapping "$name" was ${_mapping(entry.source, entry.target)}, '
-          'expected ${_mapping(expectedSource, expectedTarget)}.\n' +
+              'expected ${_mapping(expectedSource, expectedTarget)}.\n' +
           actualMap());
     }
   }

tool/grind/github.dart

@@ -46,14 +46,14 @@ String _releaseMessage() {
       "https://github.com/sass/dart-sass/blob/master/CHANGELOG.md#" +
           version.replaceAll(".", "");
   return "To install Dart Sass $version, download one of the packages above "
-      "and [add it to your PATH](https://katiek2.github.io/path-doc/), or see "
-      "[the Sass website](https://sass-lang.com/install) for full installation "
-      "instructions.\n\n"
-      "## Changes\n\n" +
+          "and [add it to your PATH](https://katiek2.github.io/path-doc/), or "
+          "see [the Sass website](https://sass-lang.com/install) for full "
+          "installation instructions.\n\n"
+          "## Changes\n\n" +
       _lastChangelogSection() +
       "\n\n"
-      "See the [full changelog]($changelogUrl) for changes in earlier "
-      "releases.";
+          "See the [full changelog]($changelogUrl) for changes in earlier "
+          "releases.";
 }
 
 /// A regular expression that matches a Markdown code block.