Always use the SDK version of the formatter

This helps guard against skew when new formatting logic is released in
the dart_style package before it's available in a stable SDK release.

Author: nex3

pubspec.yaml

@@ -41,7 +41,6 @@ dev_dependencies:
   analyzer: ^6.8.0
   archive: ^3.1.2
   crypto: ^3.0.0
-  dart_style: ^3.0.0
   dartdoc: ^8.0.14
   grinder: ^0.9.0
   node_preamble: ^2.0.2

tool/assert-formatted.sh

@@ -6,7 +6,6 @@ import 'dart:convert';
 import 'dart:io';
 
 import 'package:crypto/crypto.dart';
-import 'package:dart_style/dart_style.dart';
 import 'package:grinder/grinder.dart';
 import 'package:pub_semver/pub_semver.dart';
 import 'package:yaml/yaml.dart';
@@ -23,10 +22,9 @@ final _blockRegex =
 @Depends(updateLanguageRepo)
 void deprecations() {
   var yamlFile = File(yamlPath);
-  var dartFile = File(dartPath);
   var yamlText = yamlFile.readAsStringSync();
   var data = loadYaml(yamlText, sourceUrl: yamlFile.uri) as Map;
-  var dartText = dartFile.readAsStringSync();
+  var dartText = File(dartPath).readAsStringSync();
   var buffer = StringBuffer('''// START AUTOGENERATED CODE
   //
   // DO NOT EDIT. This section was generated from the language repo.
@@ -79,7 +77,6 @@ void deprecations() {
     fail("Couldn't find block for generated code in lib/src/deprecation.dart");
   }
   var newCode = dartText.replaceFirst(_blockRegex, buffer.toString());
-  dartFile.writeAsStringSync(DartFormatter(
-          languageVersion: Version.parse(Platform.version.split(' ').first))
-      .format(newCode));
+  File(dartPath).writeAsStringSync(newCode);
+  DartFmt.format(dartPath);
 }

tool/grind/generate_deprecations.dart

@@ -13,12 +13,12 @@ import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:collection/collection.dart';
 import 'package:crypto/crypto.dart';
-import 'package:dart_style/dart_style.dart';
 import 'package:grinder/grinder.dart';
 import 'package:path/path.dart' as p;
 import 'package:pub_semver/pub_semver.dart';
 import 'package:source_span/source_span.dart';
 
+import 'package:sass/src/util/map.dart';
 import 'package:sass/src/util/nullable.dart';
 
 /// The files to compile to synchronous versions.
@@ -47,8 +47,10 @@ final _sharedClasses = const ['EvaluateResult'];
 /// to a synchronous equivalent.
 @Task('Compile async code to synchronous code.')
 void synchronize() {
-  sources.forEach((source, target) =>
-      File(target).writeAsStringSync(synchronizeFile(source)));
+  for (var (source, target) in sources.pairs) {
+    File(target).writeAsStringSync(synchronizeFile(source));
+    DartFmt.format(target);
+  }
 }
 
 /// Returns the result of synchronizing [source].
@@ -59,9 +61,7 @@ String synchronizeFile(String source) {
   parseFile(path: source, featureSet: FeatureSet.latestLanguageVersion())
       .unit
       .accept(visitor);
-  return DartFormatter(
-          languageVersion: Version.parse(Platform.version.split(' ').first))
-      .format(visitor.result);
+  return visitor.result;
 }
 
 /// The visitor that traverses the asynchronous parse tree and converts it to