diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3c89c79f..3b9de42b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,7 @@
-## 4.10.1-wip
+## 5.0.0-wip
+
+* Remove the regular dependency on `package:matcher`.
+* Remove the `EqualsDart` class and `equalsDart()` top-level function.
 
 ## 4.10.0
 
diff --git a/lib/code_builder.dart b/lib/code_builder.dart
index 9cd15b95..66570f6a 100644
--- a/lib/code_builder.dart
+++ b/lib/code_builder.dart
@@ -5,7 +5,6 @@
 export 'src/allocator.dart' show Allocator;
 export 'src/base.dart' show Spec, lazySpec;
 export 'src/emitter.dart' show DartEmitter;
-export 'src/matchers.dart' show EqualsDart, equalsDart;
 export 'src/specs/class.dart' show Class, ClassBuilder, ClassModifier;
 export 'src/specs/code.dart'
     show Block, BlockBuilder, Code, ScopedCode, StaticCode, lazyCode;
diff --git a/lib/src/matchers.dart b/lib/src/matchers.dart
deleted file mode 100644
index 0cdf7399..00000000
--- a/lib/src/matchers.dart
+++ /dev/null
@@ -1,73 +0,0 @@
-// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:matcher/matcher.dart';
-
-import 'base.dart';
-import 'emitter.dart';
-
-/// Encodes [spec] as Dart source code.
-String _dart(Spec spec, DartEmitter emitter) =>
-    EqualsDart._format(spec.accept<StringSink>(emitter).toString());
-
-/// Returns a matcher for [Spec] objects that emit code matching [source].
-///
-/// Both [source] and the result emitted from the compared [Spec] are formatted
-/// with [EqualsDart.format]. A plain [DartEmitter] is used by default and may
-/// be overridden with [emitter].
-Matcher equalsDart(
-  String source, [
-  DartEmitter? emitter,
-]) =>
-    EqualsDart._(EqualsDart._format(source), emitter ?? DartEmitter());
-
-/// Implementation detail of using the [equalsDart] matcher.
-///
-/// See [EqualsDart.format] to specify the default source code formatter.
-class EqualsDart extends Matcher {
-  /// May override to provide a function to format Dart on [equalsDart].
-  ///
-  /// By default, uses [collapseWhitespace], but it is recommended to instead
-  /// use `dart_style` (dartfmt) where possible. See `test/common.dart` for an
-  /// example.
-  static String Function(String) format = collapseWhitespace;
-
-  static String _format(String source) {
-    try {
-      return format(source).trim();
-    } catch (_) {
-      // Ignored on purpose, probably not exactly valid Dart code.
-      return collapseWhitespace(source).trim();
-    }
-  }
-
-  final DartEmitter _emitter;
-  final String _expectedSource;
-
-  const EqualsDart._(this._expectedSource, this._emitter);
-
-  @override
-  Description describe(Description description) =>
-      description.add(_expectedSource);
-
-  @override
-  Description describeMismatch(
-    covariant Spec item,
-    Description mismatchDescription,
-    Map<dynamic, dynamic> matchState,
-    bool verbose,
-  ) {
-    final actualSource = _dart(item, _emitter);
-    return equals(_expectedSource).describeMismatch(
-      actualSource,
-      mismatchDescription,
-      matchState,
-      verbose,
-    );
-  }
-
-  @override
-  bool matches(covariant Spec item, Object? matchState) =>
-      _dart(item, _emitter) == _expectedSource;
-}
diff --git a/pubspec.yaml b/pubspec.yaml
index edaf04a2..5c9c73e7 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: code_builder
-version: 4.10.1-wip
+version: 5.0.0-wip
 description: A fluent, builder-based library for generating valid Dart code.
 repository: https://github.com/dart-lang/code_builder
 
@@ -10,7 +10,6 @@ dependencies:
   built_collection: ^5.0.0
   built_value: ^8.0.0
   collection: ^1.15.0
-  matcher: ^0.12.10
   meta: ^1.3.0
 
 dev_dependencies:
@@ -19,5 +18,6 @@ dev_dependencies:
   built_value_generator: ^8.0.0
   dart_flutter_team_lints: ^2.0.0
   dart_style: ^2.3.4
+  matcher: ^0.12.10
   source_gen: ^1.0.0
-  test: ^1.16.0
+  test: ^1.25.0
diff --git a/test/allocator_test.dart b/test/allocator_test.dart
index 09f135c5..07bce485 100644
--- a/test/allocator_test.dart
+++ b/test/allocator_test.dart
@@ -5,11 +5,7 @@
 import 'package:code_builder/code_builder.dart';
 import 'package:test/test.dart';
 
-import 'common.dart';
-
 void main() {
-  useDartfmt();
-
   group('Allocator', () {
     Allocator allocator;
 
diff --git a/test/common.dart b/test/common.dart
deleted file mode 100644
index 9bfed545..00000000
--- a/test/common.dart
+++ /dev/null
@@ -1,18 +0,0 @@
-// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:code_builder/code_builder.dart';
-import 'package:dart_style/dart_style.dart';
-
-final DartFormatter _dartfmt = DartFormatter();
-String _format(String source) {
-  try {
-    return _dartfmt.format(source);
-  } on FormatterException catch (_) {
-    return _dartfmt.formatStatement(source);
-  }
-}
-
-/// Should be invoked in `main()` of every test in `test/**_test.dart`.
-void useDartfmt() => EqualsDart.format = _format;
diff --git a/test/const_test.dart b/test/const_test.dart
index c4d69c61..0fa455e2 100644
--- a/test/const_test.dart
+++ b/test/const_test.dart
@@ -5,11 +5,9 @@
 import 'package:code_builder/code_builder.dart';
 import 'package:test/test.dart';
 
-import 'common.dart';
+import 'matchers.dart';
 
 void main() {
-  useDartfmt();
-
   final constMap = literalConstMap({
     'list': literalConstList([]),
     'duration': refer('Duration').constInstance([]),
diff --git a/test/directive_test.dart b/test/directive_test.dart
index 0aee6ae5..d95f9045 100644
--- a/test/directive_test.dart
+++ b/test/directive_test.dart
@@ -5,11 +5,9 @@
 import 'package:code_builder/code_builder.dart';
 import 'package:test/test.dart';
 
-import 'common.dart';
+import 'matchers.dart';
 
 void main() {
-  useDartfmt();
-
   final $LinkedHashMap = refer('LinkedHashMap', 'dart:collection');
 
   final library = Library((b) => b
diff --git a/test/e2e/injection_test.dart b/test/e2e/injection_test.dart
index 129f02cd..480a8d54 100644
--- a/test/e2e/injection_test.dart
+++ b/test/e2e/injection_test.dart
@@ -5,11 +5,9 @@
 import 'package:code_builder/code_builder.dart';
 import 'package:test/test.dart';
 
-import '../common.dart';
+import '../matchers.dart';
 
 void main() {
-  useDartfmt();
-
   test('should generate a complex generated file', () {
     // Imports from an existing Dart library.
     final $App = refer('App', 'package:app/app.dart');
diff --git a/test/matcher_test.dart b/test/matcher_test.dart
index c9475a84..2820b4f2 100644
--- a/test/matcher_test.dart
+++ b/test/matcher_test.dart
@@ -5,15 +5,17 @@
 import 'package:code_builder/code_builder.dart';
 import 'package:test/test.dart';
 
+import 'matchers.dart';
+
 void main() {
   test('describes mismatches', () {
     const actual = Code('final x=1;');
     equalsDart('final y=2;').expectMismatch(actual, '''
-  Expected: final y=2;
+  Expected: final y = 2;
     Actual: StaticCode:<final x=1;>
      Which: is different.
-            Expected: final y=2;
-              Actual: final x=1;
+            Expected: final y = 2;
+              Actual: final x = 1;
                             ^
              Differ at offset 6
 ''');
diff --git a/test/matchers.dart b/test/matchers.dart
new file mode 100644
index 00000000..7f1f80bb
--- /dev/null
+++ b/test/matchers.dart
@@ -0,0 +1,64 @@
+// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:code_builder/code_builder.dart';
+import 'package:dart_style/dart_style.dart';
+import 'package:matcher/matcher.dart';
+
+final DartFormatter _dartfmt = DartFormatter();
+
+/// Returns a matcher for [Spec] objects that emit code matching [source].
+///
+/// Both [source] and the result emitted from the compared [Spec] are formatted
+/// with dart_style.
+Matcher equalsDart(String source, [DartEmitter? emitter]) =>
+    _EqualsDart._(_EqualsDart._format(source), emitter ?? DartEmitter());
+
+String _emitDart(Spec spec, DartEmitter emitter) =>
+    _EqualsDart._format(spec.accept<StringSink>(emitter).toString());
+
+String _dartFormatAttempt(String source) {
+  try {
+    return _dartfmt.format(source);
+  } on FormatterException catch (_) {}
+
+  try {
+    return _dartfmt.formatStatement(source);
+  } on FormatterException catch (_) {}
+
+  return collapseWhitespace(source).trim();
+}
+
+class _EqualsDart extends Matcher {
+  static String _format(String source) => _dartFormatAttempt(source).trim();
+
+  final DartEmitter _emitter;
+  final String _expectedSource;
+
+  const _EqualsDart._(this._expectedSource, this._emitter);
+
+  @override
+  Description describe(Description description) =>
+      description.add(_expectedSource);
+
+  @override
+  Description describeMismatch(
+    covariant Spec item,
+    Description mismatchDescription,
+    Map<dynamic, dynamic> matchState,
+    bool verbose,
+  ) {
+    final actualSource = _emitDart(item, _emitter);
+    return equals(_expectedSource).describeMismatch(
+      actualSource,
+      mismatchDescription,
+      matchState,
+      verbose,
+    );
+  }
+
+  @override
+  bool matches(covariant Spec item, Object? matchState) =>
+      _emitDart(item, _emitter) == _expectedSource;
+}
diff --git a/test/specs/class_test.dart b/test/specs/class_test.dart
index 562bca4c..a6b55a6e 100644
--- a/test/specs/class_test.dart
+++ b/test/specs/class_test.dart
@@ -5,11 +5,9 @@
 import 'package:code_builder/code_builder.dart';
 import 'package:test/test.dart';
 
-import '../common.dart';
+import '../matchers.dart';
 
 void main() {
-  useDartfmt();
-
   test('should create a class', () {
     expect(
       Class((b) => b..name = 'Foo'),
diff --git a/test/specs/code/expression_test.dart b/test/specs/code/expression_test.dart
index 4ce9ebaf..b8142195 100644
--- a/test/specs/code/expression_test.dart
+++ b/test/specs/code/expression_test.dart
@@ -5,11 +5,9 @@
 import 'package:code_builder/code_builder.dart';
 import 'package:test/test.dart';
 
-import '../../common.dart';
+import '../../matchers.dart';
 
 void main() {
-  useDartfmt();
-
   test('should emit a simple expression', () {
     expect(literalNull, equalsDart('null'));
   });
diff --git a/test/specs/code/statement_test.dart b/test/specs/code/statement_test.dart
index cd3d53af..2db32e50 100644
--- a/test/specs/code/statement_test.dart
+++ b/test/specs/code/statement_test.dart
@@ -5,11 +5,9 @@
 import 'package:code_builder/code_builder.dart';
 import 'package:test/test.dart';
 
-import '../../common.dart';
+import '../../matchers.dart';
 
 void main() {
-  useDartfmt();
-
   test('should emit a block of code', () {
     expect(
       Block.of([
diff --git a/test/specs/enum_test.dart b/test/specs/enum_test.dart
index 5a0b19a2..f6a335c2 100644
--- a/test/specs/enum_test.dart
+++ b/test/specs/enum_test.dart
@@ -5,11 +5,9 @@
 import 'package:code_builder/code_builder.dart';
 import 'package:test/test.dart';
 
-import '../common.dart';
+import '../matchers.dart';
 
 void main() {
-  useDartfmt();
-
   test('should create an enum', () {
     expect(
         Enum((b) => b
diff --git a/test/specs/extension_test.dart b/test/specs/extension_test.dart
index b45fa658..c88e2fef 100644
--- a/test/specs/extension_test.dart
+++ b/test/specs/extension_test.dart
@@ -5,11 +5,9 @@
 import 'package:code_builder/code_builder.dart';
 import 'package:test/test.dart';
 
-import '../common.dart';
+import '../matchers.dart';
 
 void main() {
-  useDartfmt();
-
   test('should create an extension', () {
     expect(
       Extension((b) => b
diff --git a/test/specs/extension_type_test.dart b/test/specs/extension_type_test.dart
index cc510468..4097bb7b 100644
--- a/test/specs/extension_type_test.dart
+++ b/test/specs/extension_type_test.dart
@@ -5,11 +5,9 @@
 import 'package:code_builder/code_builder.dart';
 import 'package:test/test.dart';
 
-import '../common.dart';
+import '../matchers.dart';
 
 void main() {
-  useDartfmt();
-
   test('minimum extension type', () {
     expect(
       ExtensionType((b) => b
diff --git a/test/specs/field_test.dart b/test/specs/field_test.dart
index 3d53687b..9b0c2c08 100644
--- a/test/specs/field_test.dart
+++ b/test/specs/field_test.dart
@@ -5,11 +5,9 @@
 import 'package:code_builder/code_builder.dart';
 import 'package:test/test.dart';
 
-import '../common.dart';
+import '../matchers.dart';
 
 void main() {
-  useDartfmt();
-
   test('should create a field', () {
     expect(
       Field((b) => b..name = 'foo'),
diff --git a/test/specs/library_test.dart b/test/specs/library_test.dart
index 8ea4c581..8d9445c1 100644
--- a/test/specs/library_test.dart
+++ b/test/specs/library_test.dart
@@ -5,11 +5,9 @@
 import 'package:code_builder/code_builder.dart';
 import 'package:test/test.dart';
 
-import '../common.dart';
+import '../matchers.dart';
 
 void main() {
-  useDartfmt();
-
   group('File', () {
     final $LinkedHashMap = refer('LinkedHashMap', 'dart:collection');
 
diff --git a/test/specs/method_test.dart b/test/specs/method_test.dart
index 5621bc52..ff78a127 100644
--- a/test/specs/method_test.dart
+++ b/test/specs/method_test.dart
@@ -5,11 +5,9 @@
 import 'package:code_builder/code_builder.dart';
 import 'package:test/test.dart';
 
-import '../common.dart';
+import '../matchers.dart';
 
 void main() {
-  useDartfmt();
-
   test('should create a method', () {
     expect(
       Method((b) => b..name = 'foo'),
diff --git a/test/specs/mixin_test.dart b/test/specs/mixin_test.dart
index e167d02a..04009915 100644
--- a/test/specs/mixin_test.dart
+++ b/test/specs/mixin_test.dart
@@ -5,11 +5,9 @@
 import 'package:code_builder/code_builder.dart';
 import 'package:test/test.dart';
 
-import '../common.dart';
+import '../matchers.dart';
 
 void main() {
-  useDartfmt();
-
   test('should create a mixin', () {
     expect(
       Mixin((b) => b..name = 'Foo'),
diff --git a/test/specs/record_type_test.dart b/test/specs/record_type_test.dart
index 0084c507..3febec19 100644
--- a/test/specs/record_type_test.dart
+++ b/test/specs/record_type_test.dart
@@ -5,13 +5,11 @@
 import 'package:code_builder/code_builder.dart';
 import 'package:test/test.dart';
 
-import '../common.dart';
+import '../matchers.dart';
 
 void main() {
   late DartEmitter emitter;
 
-  useDartfmt();
-
   setUp(() => emitter = DartEmitter.scoped(useNullSafetySyntax: true));
 
   final intRef = TypeReference((b) => b.symbol = 'int');
diff --git a/test/specs/type_reference_test.dart b/test/specs/type_reference_test.dart
index 35365cbf..565bbfba 100644
--- a/test/specs/type_reference_test.dart
+++ b/test/specs/type_reference_test.dart
@@ -5,11 +5,9 @@
 import 'package:code_builder/code_builder.dart';
 import 'package:test/test.dart';
 
-import '../common.dart';
+import '../matchers.dart';
 
 void main() {
-  useDartfmt();
-
   test('should create a nullable type in a pre-Null Safety library', () {
     expect(
       TypeReference((b) => b