diff --git a/benchmarks/IsolateJson/dart/IsolateJson.dart b/benchmarks/IsolateJson/dart/IsolateJson.dart
index ccf80e5a0b3..0d7486d5b6e 100644
--- a/benchmarks/IsolateJson/dart/IsolateJson.dart
+++ b/benchmarks/IsolateJson/dart/IsolateJson.dart
@@ -38,7 +38,7 @@ class JsonDecodingBenchmark {
   final bool useSendAndExit;
 }
 
-Uint8List createSampleJson(final size) {
+Uint8List createSampleJson(size) {
   final list = List.generate(size, (i) => i);
   final map = <dynamic, dynamic>{};
   for (int i = 0; i < size; i++) {
diff --git a/runtime/tests/vm/dart/byte_array_optimized_test.dart b/runtime/tests/vm/dart/byte_array_optimized_test.dart
index 83b39fedd15..d636dd87879 100644
--- a/runtime/tests/vm/dart/byte_array_optimized_test.dart
+++ b/runtime/tests/vm/dart/byte_array_optimized_test.dart
@@ -1540,7 +1540,7 @@ class OptimizedByteArrayTest {
     testFloat64ListImpl(array);
   }
 
-  static testInt8ListViewImpl(var array) {
+  static testInt8ListViewImpl(array) {
     Expect.equals(12, array.length);
     Expect.equals(1, array.elementSizeInBytes);
     Expect.equals(12, array.lengthInBytes);
@@ -1779,7 +1779,7 @@ class OptimizedByteArrayTest {
     testInt8ListViewImpl(array);
   }
 
-  static testUint8ListViewImpl(var array) {
+  static testUint8ListViewImpl(array) {
     Expect.isTrue(array is List<int>);
     Expect.equals(12, array.length);
     Expect.equals(1, array.elementSizeInBytes);
@@ -1980,7 +1980,7 @@ class OptimizedByteArrayTest {
     testUint8ListViewImpl(array);
   }
 
-  static testInt16ListViewImpl(var array) {
+  static testInt16ListViewImpl(array) {
     Expect.equals(24, array.length);
     Expect.equals(1, array.elementSizeInBytes);
     Expect.equals(24, array.lengthInBytes);
@@ -2341,7 +2341,7 @@ class OptimizedByteArrayTest {
     testInt16ListViewImpl(array);
   }
 
-  static testUint16ListViewImpl(var array) {
+  static testUint16ListViewImpl(array) {
     Expect.isTrue(array is List<int>);
     Expect.equals(24, array.length);
     Expect.equals(1, array.elementSizeInBytes);
@@ -3144,7 +3144,7 @@ class OptimizedByteArrayTest {
     ], array);
   }
 
-  static testUint32ListViewImpl(var array) {
+  static testUint32ListViewImpl(array) {
     Expect.isTrue(array is List<int>);
     Expect.equals(48, array.length);
     Expect.equals(1, array.elementSizeInBytes);
@@ -3542,7 +3542,7 @@ class OptimizedByteArrayTest {
     testUint32ListViewImpl(array);
   }
 
-  static testInt64ListViewImpl(var array) {
+  static testInt64ListViewImpl(array) {
     Expect.equals(96, array.length);
     Expect.equals(1, array.elementSizeInBytes);
     Expect.equals(96, array.lengthInBytes);
@@ -4244,7 +4244,7 @@ class OptimizedByteArrayTest {
     testInt64ListViewImpl(array);
   }
 
-  static testUint64ListViewImpl(var array) {
+  static testUint64ListViewImpl(array) {
     Expect.isTrue(array is List<int>);
     Expect.equals(96, array.length);
     Expect.equals(1, array.elementSizeInBytes);
@@ -4743,7 +4743,7 @@ class OptimizedByteArrayTest {
     testUint64ListViewImpl(array);
   }
 
-  static testFloat32ListViewImpl(var array) {
+  static testFloat32ListViewImpl(array) {
     Expect.isTrue(array is List<int>);
     Expect.equals(12, array.length);
     Expect.equals(4, array.elementSizeInBytes);
@@ -4973,7 +4973,7 @@ class OptimizedByteArrayTest {
     testFloat32ListViewImpl(array);
   }
 
-  static testFloat64ListViewImpl(var array) {
+  static testFloat64ListViewImpl(array) {
     Expect.isTrue(array is List<int>);
     Expect.equals(12, array.length);
     Expect.equals(8, array.elementSizeInBytes);
diff --git a/runtime/tests/vm/dart/byte_array_test.dart b/runtime/tests/vm/dart/byte_array_test.dart
index db1704ea1a1..4805c019b9a 100644
--- a/runtime/tests/vm/dart/byte_array_test.dart
+++ b/runtime/tests/vm/dart/byte_array_test.dart
@@ -2107,7 +2107,7 @@ class ByteArrayTest {
     // TODO: byte_array.getFloat64(0)
   }
 
-  static testInt8ListViewImpl(var array) {
+  static testInt8ListViewImpl(array) {
     Expect.equals(12, array.length);
     Expect.equals(1, array.elementSizeInBytes);
     Expect.equals(12, array.lengthInBytes);
@@ -2346,7 +2346,7 @@ class ByteArrayTest {
     testInt8ListViewImpl(array);
   }
 
-  static testUint8ListViewImpl(var array) {
+  static testUint8ListViewImpl(array) {
     Expect.isTrue(array is List<int>);
     Expect.equals(12, array.length);
     Expect.equals(1, array.elementSizeInBytes);
@@ -2547,7 +2547,7 @@ class ByteArrayTest {
     testUint8ListViewImpl(array);
   }
 
-  static testInt16ListViewImpl(var array) {
+  static testInt16ListViewImpl(array) {
     Expect.equals(24, array.length);
     Expect.equals(1, array.elementSizeInBytes);
     Expect.equals(24, array.lengthInBytes);
@@ -2908,7 +2908,7 @@ class ByteArrayTest {
     testInt16ListViewImpl(array);
   }
 
-  static testUint16ListViewImpl(var array) {
+  static testUint16ListViewImpl(array) {
     Expect.isTrue(array is List<int>);
     Expect.equals(24, array.length);
     Expect.equals(1, array.elementSizeInBytes);
@@ -3711,7 +3711,7 @@ class ByteArrayTest {
     ], array);
   }
 
-  static testUint32ListViewImpl(var array) {
+  static testUint32ListViewImpl(array) {
     Expect.isTrue(array is List<int>);
     Expect.equals(48, array.length);
     Expect.equals(1, array.elementSizeInBytes);
@@ -4109,7 +4109,7 @@ class ByteArrayTest {
     testUint32ListViewImpl(array);
   }
 
-  static testInt64ListViewImpl(var array) {
+  static testInt64ListViewImpl(array) {
     Expect.equals(96, array.length);
     Expect.equals(1, array.elementSizeInBytes);
     Expect.equals(96, array.lengthInBytes);
@@ -4811,7 +4811,7 @@ class ByteArrayTest {
     testInt64ListViewImpl(array);
   }
 
-  static testUint64ListViewImpl(var array) {
+  static testUint64ListViewImpl(array) {
     Expect.isTrue(array is List<int>);
     Expect.equals(96, array.length);
     Expect.equals(1, array.elementSizeInBytes);
@@ -5310,7 +5310,7 @@ class ByteArrayTest {
     testUint64ListViewImpl(array);
   }
 
-  static testFloat32ListViewImpl(var array) {
+  static testFloat32ListViewImpl(array) {
     Expect.isTrue(array is List<int>);
     Expect.equals(12, array.length);
     Expect.equals(4, array.elementSizeInBytes);
@@ -5540,7 +5540,7 @@ class ByteArrayTest {
     testFloat32ListViewImpl(array);
   }
 
-  static testFloat64ListViewImpl(var array) {
+  static testFloat64ListViewImpl(array) {
     Expect.isTrue(array is List<int>);
     Expect.equals(12, array.length);
     Expect.equals(8, array.elementSizeInBytes);
diff --git a/runtime/tests/vm/dart/inline_local_functions_il_test.dart b/runtime/tests/vm/dart/inline_local_functions_il_test.dart
index 1f9ecf06ca3..4fad0c655a5 100644
--- a/runtime/tests/vm/dart/inline_local_functions_il_test.dart
+++ b/runtime/tests/vm/dart/inline_local_functions_il_test.dart
@@ -14,7 +14,7 @@ int run(int Function() fn) => fn();
 @pragma('vm:testing:match-inner-flow-graph', 'foo')
 void main() {
   const int N = 100;
-  int id(final int i) => i;
+  int id(int i) => i;
 
   @pragma('vm:testing:print-flow-graph')
   int foo() {
diff --git a/runtime/tests/vm/dart/inline_stack_frame_test.dart b/runtime/tests/vm/dart/inline_stack_frame_test.dart
index 614357188b8..b48606bce0c 100644
--- a/runtime/tests/vm/dart/inline_stack_frame_test.dart
+++ b/runtime/tests/vm/dart/inline_stack_frame_test.dart
@@ -18,7 +18,7 @@
 
 class Test {
   @pragma("vm:entry-point")
-  String func1(var k) {
+  String func1(k) {
     try {
       for (var i = 0; i <= 50; i++) {
         func2(i * k);
@@ -31,7 +31,7 @@ class Test {
   }
 
   @pragma("vm:entry-point")
-  int func2(var i) {
+  int func2(i) {
     var result = 0;
     for (var k = 0; k <= 10; k++) {
       result += func3(i + k);
@@ -40,7 +40,7 @@ class Test {
   }
 
   @pragma("vm:entry-point")
-  int func3(var i) {
+  int func3(i) {
     var result = 0;
     for (var l = 0; l <= 1; l++) {
       result += func4(i + l);
@@ -49,7 +49,7 @@ class Test {
   }
 
   @pragma("vm:entry-point")
-  int func4(var i) {
+  int func4(i) {
     var result = 0;
     for (var j = 0; j <= 10; j++) {
       result += func5(i + j);
@@ -58,7 +58,7 @@ class Test {
   }
 
   @pragma("vm:entry-point")
-  int func5(var i) {
+  int func5(i) {
     if (i >= 520) throw "show me inlined functions";
     return i;
   }
diff --git a/runtime/tests/vm/dart/isolates/fast_object_copy2_test.dart b/runtime/tests/vm/dart/isolates/fast_object_copy2_test.dart
index 1c5c2be185b..d15b34231d2 100644
--- a/runtime/tests/vm/dart/isolates/fast_object_copy2_test.dart
+++ b/runtime/tests/vm/dart/isolates/fast_object_copy2_test.dart
@@ -166,7 +166,7 @@ final copyableClosures = <dynamic>[
     return inner;
   }(),
   () {
-    foo(var arg) {
+    foo(arg) {
       return () => arg;
     }
 
diff --git a/runtime/tests/vm/dart/isolates/fast_object_copy_test.dart b/runtime/tests/vm/dart/isolates/fast_object_copy_test.dart
index 160a3f3c7b3..afa6f85ccf8 100644
--- a/runtime/tests/vm/dart/isolates/fast_object_copy_test.dart
+++ b/runtime/tests/vm/dart/isolates/fast_object_copy_test.dart
@@ -41,7 +41,7 @@ final nonCopyableClosures = <dynamic>[
     return inner;
   })(),
   (() {
-    foo(var arg) {
+    foo(arg) {
       return () => arg;
     }
 
diff --git a/runtime/tests/vm/dart/issue_31959_31960_test.dart b/runtime/tests/vm/dart/issue_31959_31960_test.dart
index f6c28c89491..da3f83a6c13 100644
--- a/runtime/tests/vm/dart/issue_31959_31960_test.dart
+++ b/runtime/tests/vm/dart/issue_31959_31960_test.dart
@@ -10,7 +10,7 @@ import 'dart:typed_data';
 import 'package:expect/async_helper.dart' show asyncStart, asyncEnd;
 import 'package:expect/expect.dart';
 
-Uint8List generateSampleList(final int size) {
+Uint8List generateSampleList(int size) {
   final list = Uint8List(size);
   for (int i = 0; i < size; i++) {
     list[i] = i % 243;
@@ -18,7 +18,7 @@ Uint8List generateSampleList(final int size) {
   return list;
 }
 
-void validateReceivedList(final int expectedSize, final list) {
+void validateReceivedList(int expectedSize, list) {
   Expect.equals(expectedSize, list.length);
   // probe few elements
   for (
diff --git a/runtime/tests/vm/dart/random_walk_fuzzer.dart b/runtime/tests/vm/dart/random_walk_fuzzer.dart
index 066e403518f..99f8c165a4e 100644
--- a/runtime/tests/vm/dart/random_walk_fuzzer.dart
+++ b/runtime/tests/vm/dart/random_walk_fuzzer.dart
@@ -102,7 +102,7 @@ List<Candidate<ObjectMirror>> candidateReceivers = <Candidate<ObjectMirror>>[];
 List<Candidate<InstanceMirror>> candidateArguments =
     <Candidate<InstanceMirror>>[];
 
-void addInstance(var instance) {
+void addInstance(instance) {
   addInstanceMirror(reflect(instance));
 }
 
diff --git a/runtime/tests/vm/dart/transferable_throws_test.dart b/runtime/tests/vm/dart/transferable_throws_test.dart
index b1585e11120..0de3bb45da6 100644
--- a/runtime/tests/vm/dart/transferable_throws_test.dart
+++ b/runtime/tests/vm/dart/transferable_throws_test.dart
@@ -64,7 +64,7 @@ throwsIfReceiverMaterializesMoreThanOnce() async {
   isolateErrors.close();
 }
 
-void receiver(final transferable) {
+void receiver(transferable) {
   transferable.materialize();
   transferable.materialize();
 }
diff --git a/runtime/tests/vm/dart/truncating_ints_test.dart b/runtime/tests/vm/dart/truncating_ints_test.dart
index a988482686e..326030d3c10 100644
--- a/runtime/tests/vm/dart/truncating_ints_test.dart
+++ b/runtime/tests/vm/dart/truncating_ints_test.dart
@@ -9,16 +9,16 @@
 import "package:expect/expect.dart";
 
 @pragma('vm:never-inline')
-add_smi(var a, var b) => a + b;
+add_smi(a, b) => a + b;
 
 @pragma('vm:never-inline')
-add_mint(var a, var b) => a + b;
+add_mint(a, b) => a + b;
 
 @pragma('vm:never-inline')
 add_mint_consts() => 0x5000000000000000 + 0x6000000000000000;
 
 @pragma('vm:never-inline')
-test_add(var v2, var v3, var v3fxx, var v5fxx, var v7fxx, var n60xx) {
+test_add(v2, v3, v3fxx, v5fxx, v7fxx, n60xx) {
   for (var i = 0; i < 20; i++) {
     Expect.equals(5, add_smi(v2, v3));
   }
@@ -44,16 +44,16 @@ test_add(var v2, var v3, var v3fxx, var v5fxx, var v7fxx, var n60xx) {
 }
 
 @pragma('vm:never-inline')
-sub_smi(var a, var b) => a - b;
+sub_smi(a, b) => a - b;
 
 @pragma('vm:never-inline')
-sub_mint(var a, var b) => a - b;
+sub_mint(a, b) => a - b;
 
 @pragma('vm:never-inline')
 sub_mint_consts() => (-0x5000000000000000) - 0x6000000000000000;
 
 @pragma('vm:never-inline')
-test_sub(var v2, var v3, var v3fxx, var v5fxx, var v7fxx, var n60xx) {
+test_sub(v2, v3, v3fxx, v5fxx, v7fxx, n60xx) {
   for (var i = 0; i < 20; i++) {
     Expect.equals(1, sub_smi(v3, v2));
   }
@@ -79,16 +79,16 @@ test_sub(var v2, var v3, var v3fxx, var v5fxx, var v7fxx, var n60xx) {
 }
 
 @pragma('vm:never-inline')
-mul_smi(var a, var b) => a * b;
+mul_smi(a, b) => a * b;
 
 @pragma('vm:never-inline')
-mul_mint(var a, var b) => a * b;
+mul_mint(a, b) => a * b;
 
 @pragma('vm:never-inline')
 mul_mint_consts() => 0x5000000000000001 * 0x6000000000000001;
 
 @pragma('vm:never-inline')
-test_mul(var v2, var v3, var v3fxx, var v5fxx, var v7fxx, var n60xx) {
+test_mul(v2, v3, v3fxx, v5fxx, v7fxx, n60xx) {
   for (var i = 0; i < 20; i++) {
     Expect.equals(6, mul_smi(v2, v3));
   }
@@ -110,25 +110,25 @@ test_mul(var v2, var v3, var v3fxx, var v5fxx, var v7fxx, var n60xx) {
 }
 
 @pragma('vm:never-inline')
-shl_smi(var a, var b) => a << b;
+shl_smi(a, b) => a << b;
 
 @pragma('vm:never-inline')
-shl_mint(var a, var b) => a << b;
+shl_mint(a, b) => a << b;
 
 @pragma('vm:never-inline')
-shl_mint_by_const16(var a) => a << 16;
+shl_mint_by_const16(a) => a << 16;
 
 @pragma('vm:never-inline')
-shl_smi_by_const96(var a) => a << 96;
+shl_smi_by_const96(a) => a << 96;
 
 @pragma('vm:never-inline')
-shl_mint_by_const96(var a) => a << 96;
+shl_mint_by_const96(a) => a << 96;
 
 @pragma('vm:never-inline')
 shl_mint_consts() => 0x77665544aabbccdd << 48;
 
 @pragma('vm:never-inline')
-test_shl(var v2, var v3, var v8, var v40) {
+test_shl(v2, v3, v8, v40) {
   for (var i = 0; i < 20; i++) {
     Expect.equals(16, shl_smi(v2, v3));
   }
diff --git a/runtime/vm/compiler/recognized_methods_list.h b/runtime/vm/compiler/recognized_methods_list.h
index bc5354dc32e..6795f67f91d 100644
--- a/runtime/vm/compiler/recognized_methods_list.h
+++ b/runtime/vm/compiler/recognized_methods_list.h
@@ -44,7 +44,7 @@ namespace dart {
   V(CoreLibrary, _Record, get:_numFields, Record_numFields, 0x7ba4f393)        \
   V(CoreLibrary, _Record, get:_shape, Record_shape, 0x70c40933)                \
   V(CoreLibrary, _Record, _fieldAt, Record_fieldAt, 0xb47fa0b3)                \
-  V(CoreLibrary, _StringBase, _interpolate, StringBaseInterpolate, 0xc2be3a8b) \
+  V(CoreLibrary, _StringBase, _interpolate, StringBaseInterpolate, 0xecb2534a) \
   V(CoreLibrary, _StringBase, codeUnitAt, StringBaseCodeUnitAt, 0x17dbf511)    \
   V(CoreLibrary, _IntegerImplementation, toDouble, IntegerToDouble,            \
     0x97557386)                                                                \
diff --git a/sdk/lib/_internal/js_dev_runtime/patch/core_patch.dart b/sdk/lib/_internal/js_dev_runtime/patch/core_patch.dart
index 03763c3dd35..35625ec1714 100644
--- a/sdk/lib/_internal/js_dev_runtime/patch/core_patch.dart
+++ b/sdk/lib/_internal/js_dev_runtime/patch/core_patch.dart
@@ -654,7 +654,7 @@ class NoSuchMethodError {
     }
     var namedArguments = _namedArguments;
     if (namedArguments != null) {
-      namedArguments.forEach((Symbol key, var value) {
+      namedArguments.forEach((Symbol key, value) {
         sb.write(comma);
         sb.write(_symbolToString(key));
         sb.write(": ");
diff --git a/sdk/lib/_internal/js_dev_runtime/patch/io_patch.dart b/sdk/lib/_internal/js_dev_runtime/patch/io_patch.dart
index f54f7cd064a..e2a00495c7f 100644
--- a/sdk/lib/_internal/js_dev_runtime/patch/io_patch.dart
+++ b/sdk/lib/_internal/js_dev_runtime/patch/io_patch.dart
@@ -203,7 +203,7 @@ class _File {
 @patch
 class _Namespace {
   @patch
-  static void _setupNamespace(var namespace) {
+  static void _setupNamespace(namespace) {
     throw UnsupportedError("_Namespace");
   }
 
diff --git a/sdk/lib/_internal/js_dev_runtime/patch/isolate_patch.dart b/sdk/lib/_internal/js_dev_runtime/patch/isolate_patch.dart
index 64695fcc928..7073bb63416 100644
--- a/sdk/lib/_internal/js_dev_runtime/patch/isolate_patch.dart
+++ b/sdk/lib/_internal/js_dev_runtime/patch/isolate_patch.dart
@@ -46,7 +46,7 @@ class Isolate {
   static Future<Isolate> spawnUri(
     Uri uri,
     List<String> args,
-    var message, {
+    message, {
     bool paused = false,
     SendPort? onExit,
     SendPort? onError,
diff --git a/sdk/lib/_internal/js_runtime/lib/collection_patch.dart b/sdk/lib/_internal/js_runtime/lib/collection_patch.dart
index 8f56484ba21..4ec00cf5b33 100644
--- a/sdk/lib/_internal/js_runtime/lib/collection_patch.dart
+++ b/sdk/lib/_internal/js_runtime/lib/collection_patch.dart
@@ -283,7 +283,7 @@ base class _HashMap<K, V> extends MapBase<K, V> implements HashMap<K, V> {
     return result;
   }
 
-  void _addHashTableEntry(var table, K key, V value) {
+  void _addHashTableEntry(table, K key, V value) {
     if (!_hasTableEntry(table, key)) {
       _length++;
       _keys = null;
@@ -291,7 +291,7 @@ base class _HashMap<K, V> extends MapBase<K, V> implements HashMap<K, V> {
     _setTableEntry(table, key, value);
   }
 
-  V? _removeHashTableEntry(var table, Object? key) {
+  V? _removeHashTableEntry(table, Object? key) {
     if (table != null && _hasTableEntry(table, key)) {
       V value = _getTableEntry(table, key);
       _deleteTableEntry(table, key);
@@ -303,25 +303,25 @@ base class _HashMap<K, V> extends MapBase<K, V> implements HashMap<K, V> {
     }
   }
 
-  static bool _isStringKey(var key) {
+  static bool _isStringKey(key) {
     return key is String && key != '__proto__';
   }
 
-  static bool _isNumericKey(var key) {
+  static bool _isNumericKey(key) {
     // Only treat unsigned 30-bit integers as numeric keys. This way,
     // we avoid converting them to strings when we use them as keys in
     // the JavaScript hash table object.
     return key is num && JS('bool', '(# & #) === #', key, _mask30, key);
   }
 
-  int _computeHashCode(var key) {
+  int _computeHashCode(key) {
     // We force the hash codes to be unsigned 30-bit integers to avoid
     // issues with problematic keys like '__proto__'. Another option
     // would be to throw an exception if the hash code isn't a number.
     return JS('int', '# & #', key.hashCode, _mask30);
   }
 
-  static bool _hasTableEntry(var table, var key) {
+  static bool _hasTableEntry(table, key) {
     var entry = JS('var', '#[#]', table, key);
     // We take care to only store non-null entries in the table, so we
     // can check if the table has an entry for the given key with a
@@ -329,14 +329,14 @@ base class _HashMap<K, V> extends MapBase<K, V> implements HashMap<K, V> {
     return entry != null;
   }
 
-  static _getTableEntry(var table, var key) {
+  static _getTableEntry(table, key) {
     var entry = JS('var', '#[#]', table, key);
     // We store the table itself as the entry to signal that it really
     // is a null value, so we have to map back to null here.
     return JS('bool', '# === #', entry, table) ? null : entry;
   }
 
-  static void _setTableEntry(var table, var key, var value) {
+  static void _setTableEntry(table, key, value) {
     // We only store non-null entries in the table, so we have to
     // change null values to refer to the table itself. Such values
     // will be recognized and mapped back to null on access.
@@ -350,16 +350,16 @@ base class _HashMap<K, V> extends MapBase<K, V> implements HashMap<K, V> {
     }
   }
 
-  static void _deleteTableEntry(var table, var key) {
+  static void _deleteTableEntry(table, key) {
     JS('void', 'delete #[#]', table, key);
   }
 
-  List? _getBucket(var table, var key) {
+  List? _getBucket(table, key) {
     var hash = _computeHashCode(key);
     return JS('var', '#[#]', table, hash);
   }
 
-  int _findBucketIndex(var bucket, var key) {
+  int _findBucketIndex(bucket, key) {
     if (bucket == null) return -1;
     int length = JS('int', '#.length', bucket);
     for (int i = 0; i < length; i += 2) {
@@ -383,14 +383,14 @@ base class _HashMap<K, V> extends MapBase<K, V> implements HashMap<K, V> {
 }
 
 base class _IdentityHashMap<K, V> extends _HashMap<K, V> {
-  int _computeHashCode(var key) {
+  int _computeHashCode(key) {
     // We force the hash codes to be unsigned 30-bit integers to avoid
     // issues with problematic keys like '__proto__'. Another option
     // would be to throw an exception if the hash code isn't a number.
     return JS('int', '# & #', identityHashCode(key), _mask30);
   }
 
-  int _findBucketIndex(var bucket, var key) {
+  int _findBucketIndex(bucket, key) {
     if (bucket == null) return -1;
     int length = JS('int', '#.length', bucket);
     for (int i = 0; i < length; i += 2) {
@@ -427,14 +427,14 @@ base class _CustomHashMap<K, V> extends _HashMap<K, V> {
     return super._remove(key);
   }
 
-  int _computeHashCode(var key) {
+  int _computeHashCode(key) {
     // We force the hash codes to be unsigned 30-bit integers to avoid
     // issues with problematic keys like '__proto__'. Another option
     // would be to throw an exception if the hash code isn't a number.
     return JS('int', '# & #', _hashCode(key), _mask30);
   }
 
-  int _findBucketIndex(var bucket, var key) {
+  int _findBucketIndex(bucket, key) {
     if (bucket == null) return -1;
     int length = JS('int', '#.length', bucket);
     for (int i = 0; i < length; i += 2) {
@@ -585,14 +585,14 @@ base class _LinkedCustomHashMap<K, V> extends JsLinkedHashMap<K, V> {
     return super.internalRemove(key);
   }
 
-  int internalComputeHashCode(var key) {
+  int internalComputeHashCode(key) {
     // We force the hash codes to be unsigned 30-bit integers to avoid
     // issues with problematic keys like '__proto__'. Another option
     // would be to throw an exception if the hash code isn't a number.
     return JS('int', '# & #', _hashCode(key), _mask30);
   }
 
-  int internalFindBucketIndex(var bucket, var key) {
+  int internalFindBucketIndex(bucket, key) {
     if (bucket == null) return -1;
     int length = JS('int', '#.length', bucket);
     for (int i = 0; i < length; i++) {
@@ -839,7 +839,7 @@ base class _HashSet<E> extends _SetBase<E> implements HashSet<E> {
     return result;
   }
 
-  bool _addHashTableEntry(var table, E element) {
+  bool _addHashTableEntry(table, E element) {
     if (_hasTableEntry(table, element)) return false;
     _setTableEntry(table, element, 0);
     _length++;
@@ -847,7 +847,7 @@ base class _HashSet<E> extends _SetBase<E> implements HashSet<E> {
     return true;
   }
 
-  bool _removeHashTableEntry(var table, Object? element) {
+  bool _removeHashTableEntry(table, Object? element) {
     if (table != null && _hasTableEntry(table, element)) {
       _deleteTableEntry(table, element);
       _length--;
@@ -858,11 +858,11 @@ base class _HashSet<E> extends _SetBase<E> implements HashSet<E> {
     }
   }
 
-  static bool _isStringElement(var element) {
+  static bool _isStringElement(element) {
     return element is String && element != '__proto__';
   }
 
-  static bool _isNumericElement(var element) {
+  static bool _isNumericElement(element) {
     // Only treat unsigned 30-bit integers as numeric elements. This
     // way, we avoid converting them to strings when we use them as
     // keys in the JavaScript hash table object.
@@ -870,7 +870,7 @@ base class _HashSet<E> extends _SetBase<E> implements HashSet<E> {
         JS('bool', '(# & #) === #', element, _mask30, element);
   }
 
-  int _computeHashCode(var element) {
+  int _computeHashCode(element) {
     // We force the hash codes to be unsigned 30-bit integers to avoid
     // issues with problematic elements like '__proto__'. Another
     // option would be to throw an exception if the hash code isn't a
@@ -878,7 +878,7 @@ base class _HashSet<E> extends _SetBase<E> implements HashSet<E> {
     return JS('int', '# & #', element.hashCode, _mask30);
   }
 
-  static bool _hasTableEntry(var table, var key) {
+  static bool _hasTableEntry(table, key) {
     var entry = JS('var', '#[#]', table, key);
     // We take care to only store non-null entries in the table, so we
     // can check if the table has an entry for the given key with a
@@ -886,21 +886,21 @@ base class _HashSet<E> extends _SetBase<E> implements HashSet<E> {
     return entry != null;
   }
 
-  static void _setTableEntry(var table, var key, var value) {
+  static void _setTableEntry(table, key, value) {
     assert(value != null);
     JS('void', '#[#] = #', table, key, value);
   }
 
-  static void _deleteTableEntry(var table, var key) {
+  static void _deleteTableEntry(table, key) {
     JS('void', 'delete #[#]', table, key);
   }
 
-  List? _getBucket(var table, var element) {
+  List? _getBucket(table, element) {
     var hash = _computeHashCode(element);
     return JS('var', '#[#]', table, hash);
   }
 
-  int _findBucketIndex(var bucket, var element) {
+  int _findBucketIndex(bucket, element) {
     if (bucket == null) return -1;
     int length = JS('int', '#.length', bucket);
     for (int i = 0; i < length; i++) {
@@ -927,14 +927,14 @@ base class _IdentityHashSet<E> extends _HashSet<E> {
   Set<E> _newSet() => _IdentityHashSet<E>();
   Set<R> _newSimilarSet<R>() => _IdentityHashSet<R>();
 
-  int _computeHashCode(var key) {
+  int _computeHashCode(key) {
     // We force the hash codes to be unsigned 30-bit integers to avoid
     // issues with problematic keys like '__proto__'. Another option
     // would be to throw an exception if the hash code isn't a number.
     return JS('int', '# & #', identityHashCode(key), _mask30);
   }
 
-  int _findBucketIndex(var bucket, var element) {
+  int _findBucketIndex(bucket, element) {
     if (bucket == null) return -1;
     int length = JS('int', '#.length', bucket);
     for (int i = 0; i < length; i++) {
@@ -954,7 +954,7 @@ base class _CustomHashSet<E> extends _HashSet<E> {
   Set<E> _newSet() => _CustomHashSet<E>(_equality, _hasher, _validKey);
   Set<R> _newSimilarSet<R>() => _HashSet<R>();
 
-  int _findBucketIndex(var bucket, var element) {
+  int _findBucketIndex(bucket, element) {
     if (bucket == null) return -1;
     int length = JS('int', '#.length', bucket);
     for (int i = 0; i < length; i++) {
@@ -963,7 +963,7 @@ base class _CustomHashSet<E> extends _HashSet<E> {
     return -1;
   }
 
-  int _computeHashCode(var element) {
+  int _computeHashCode(element) {
     // We force the hash codes to be unsigned 30-bit integers to avoid
     // issues with problematic elements like '__proto__'. Another
     // option would be to throw an exception if the hash code isn't a
@@ -1265,14 +1265,14 @@ base class _LinkedHashSet<E> extends _SetBase<E> implements LinkedHashSet<E> {
     }
   }
 
-  bool _addHashTableEntry(var table, E element) {
+  bool _addHashTableEntry(table, E element) {
     _LinkedHashSetCell? cell = _getTableEntry(table, element);
     if (cell != null) return false;
     _setTableEntry(table, element, _newLinkedCell(element));
     return true;
   }
 
-  bool _removeHashTableEntry(var table, Object? element) {
+  bool _removeHashTableEntry(table, Object? element) {
     if (table == null) return false;
     _LinkedHashSetCell? cell = _getTableEntry(table, element);
     if (cell == null) return false;
@@ -1323,11 +1323,11 @@ base class _LinkedHashSet<E> extends _SetBase<E> implements LinkedHashSet<E> {
     _modified();
   }
 
-  static bool _isStringElement(var element) {
+  static bool _isStringElement(element) {
     return element is String && element != '__proto__';
   }
 
-  static bool _isNumericElement(var element) {
+  static bool _isNumericElement(element) {
     // Only treat unsigned 30-bit integers as numeric elements. This
     // way, we avoid converting them to strings when we use them as
     // keys in the JavaScript hash table object.
@@ -1335,7 +1335,7 @@ base class _LinkedHashSet<E> extends _SetBase<E> implements LinkedHashSet<E> {
         JS('bool', '(# & #) === #', element, _mask30, element);
   }
 
-  int _computeHashCode(var element) {
+  int _computeHashCode(element) {
     // We force the hash codes to be unsigned 30-bit integers to avoid
     // issues with problematic elements like '__proto__'. Another
     // option would be to throw an exception if the hash code isn't a
@@ -1343,25 +1343,25 @@ base class _LinkedHashSet<E> extends _SetBase<E> implements LinkedHashSet<E> {
     return JS('int', '# & #', element.hashCode, _mask30);
   }
 
-  static _getTableEntry(var table, var key) {
+  static _getTableEntry(table, key) {
     return JS('var', '#[#]', table, key);
   }
 
-  static void _setTableEntry(var table, var key, var value) {
+  static void _setTableEntry(table, key, value) {
     assert(value != null);
     JS('void', '#[#] = #', table, key, value);
   }
 
-  static void _deleteTableEntry(var table, var key) {
+  static void _deleteTableEntry(table, key) {
     JS('void', 'delete #[#]', table, key);
   }
 
-  List? _getBucket(var table, var element) {
+  List? _getBucket(table, element) {
     var hash = _computeHashCode(element);
     return JS('var', '#[#]', table, hash);
   }
 
-  int _findBucketIndex(var bucket, var element) {
+  int _findBucketIndex(bucket, element) {
     if (bucket == null) return -1;
     int length = JS('int', '#.length', bucket);
     for (int i = 0; i < length; i++) {
@@ -1389,14 +1389,14 @@ base class _LinkedIdentityHashSet<E> extends _LinkedHashSet<E> {
   Set<E> _newSet() => _LinkedIdentityHashSet<E>();
   Set<R> _newSimilarSet<R>() => _LinkedIdentityHashSet<R>();
 
-  int _computeHashCode(var key) {
+  int _computeHashCode(key) {
     // We force the hash codes to be unsigned 30-bit integers to avoid
     // issues with problematic keys like '__proto__'. Another option
     // would be to throw an exception if the hash code isn't a number.
     return JS('int', '# & #', identityHashCode(key), _mask30);
   }
 
-  int _findBucketIndex(var bucket, var element) {
+  int _findBucketIndex(bucket, element) {
     if (bucket == null) return -1;
     int length = JS('int', '#.length', bucket);
     for (int i = 0; i < length; i++) {
@@ -1420,7 +1420,7 @@ base class _LinkedCustomHashSet<E> extends _LinkedHashSet<E> {
   Set<E> _newSet() => _LinkedCustomHashSet<E>(_equality, _hasher, _validKey);
   Set<R> _newSimilarSet<R>() => _LinkedHashSet<R>();
 
-  int _findBucketIndex(var bucket, var element) {
+  int _findBucketIndex(bucket, element) {
     if (bucket == null) return -1;
     int length = JS('int', '#.length', bucket);
     for (int i = 0; i < length; i++) {
@@ -1430,7 +1430,7 @@ base class _LinkedCustomHashSet<E> extends _LinkedHashSet<E> {
     return -1;
   }
 
-  int _computeHashCode(var element) {
+  int _computeHashCode(element) {
     // We force the hash codes to be unsigned 30-bit integers to avoid
     // issues with problematic elements like '__proto__'. Another
     // option would be to throw an exception if the hash code isn't a
diff --git a/sdk/lib/_internal/js_runtime/lib/core_patch.dart b/sdk/lib/_internal/js_runtime/lib/core_patch.dart
index cc3be729232..39c106db01b 100644
--- a/sdk/lib/_internal/js_runtime/lib/core_patch.dart
+++ b/sdk/lib/_internal/js_runtime/lib/core_patch.dart
@@ -657,7 +657,7 @@ class NoSuchMethodError {
     }
     var namedArguments = _namedArguments;
     if (namedArguments != null) {
-      namedArguments.forEach((Symbol key, var value) {
+      namedArguments.forEach((Symbol key, value) {
         sb.write(comma);
         sb.write(_symbolToString(key));
         sb.write(": ");
diff --git a/sdk/lib/_internal/js_runtime/lib/io_patch.dart b/sdk/lib/_internal/js_runtime/lib/io_patch.dart
index 4f7c3e937ee..7ee40501d25 100644
--- a/sdk/lib/_internal/js_runtime/lib/io_patch.dart
+++ b/sdk/lib/_internal/js_runtime/lib/io_patch.dart
@@ -199,7 +199,7 @@ class _File {
 @patch
 class _Namespace {
   @patch
-  static void _setupNamespace(var namespace) {
+  static void _setupNamespace(namespace) {
     throw UnsupportedError("_Namespace");
   }
 
diff --git a/sdk/lib/_internal/js_runtime/lib/isolate_patch.dart b/sdk/lib/_internal/js_runtime/lib/isolate_patch.dart
index 2ac0732d045..192971d2c9d 100644
--- a/sdk/lib/_internal/js_runtime/lib/isolate_patch.dart
+++ b/sdk/lib/_internal/js_runtime/lib/isolate_patch.dart
@@ -58,7 +58,7 @@ class Isolate {
   static Future<Isolate> spawnUri(
     Uri uri,
     List<String> args,
-    var message, {
+    message, {
     bool paused = false,
     SendPort? onExit,
     SendPort? onError,
diff --git a/sdk/lib/_internal/js_runtime/lib/js_helper.dart b/sdk/lib/_internal/js_runtime/lib/js_helper.dart
index 5a5c62d945a..0fef3cec02a 100644
--- a/sdk/lib/_internal/js_runtime/lib/js_helper.dart
+++ b/sdk/lib/_internal/js_runtime/lib/js_helper.dart
@@ -135,7 +135,7 @@ getType(int index) {
 /// JS engine.
 requiresPreamble() {}
 
-bool isJsIndexable(var object, var record) {
+bool isJsIndexable(object, record) {
   if (record != null) {
     var result = dispatchRecordIndexability(record);
     if (result != null) return result;
@@ -2227,22 +2227,22 @@ copyAndJsonifyProperties(from, Map to) {
 }
 
 /// Returns the property [index] of the JavaScript array [array].
-getIndex(var array, int index) {
+getIndex(array, int index) {
   return JS('var', r'#[#]', array, index);
 }
 
 /// Returns the length of the JavaScript array [array].
-int getLength(var array) {
+int getLength(array) {
   return JS('int', r'#.length', array);
 }
 
 _invokeClosure(
   Function closure,
   int numberOfArguments,
-  var arg1,
-  var arg2,
-  var arg3,
-  var arg4,
+  arg1,
+  arg2,
+  arg3,
+  arg4,
 ) {
   switch (numberOfArguments) {
     case 0:
@@ -3038,11 +3038,11 @@ final class BoundClosure extends TearOffClosure {
   }
 }
 
-bool jsHasOwnProperty(var jsObject, String property) {
+bool jsHasOwnProperty(jsObject, String property) {
   return JS('bool', r'#.hasOwnProperty(#)', jsObject, property);
 }
 
-jsPropertyAccess(var jsObject, String property) {
+jsPropertyAccess(jsObject, String property) {
   return JS('var', r'#[#]', jsObject, property);
 }
 
diff --git a/sdk/lib/_internal/js_runtime/lib/linked_hash_map.dart b/sdk/lib/_internal/js_runtime/lib/linked_hash_map.dart
index c19a5cd5fbf..00d5afd94a0 100644
--- a/sdk/lib/_internal/js_runtime/lib/linked_hash_map.dart
+++ b/sdk/lib/_internal/js_runtime/lib/linked_hash_map.dart
@@ -198,7 +198,7 @@ class JsLinkedHashMap<K, V> extends MapBase<K, V>
     }
   }
 
-  void _addHashTableEntry(var table, K key, V value) {
+  void _addHashTableEntry(table, K key, V value) {
     LinkedHashMapCell? cell = _getTableCell(table, key);
     if (cell == null) {
       _setTableEntry(table, key, _newLinkedCell(key, value));
@@ -207,7 +207,7 @@ class JsLinkedHashMap<K, V> extends MapBase<K, V>
     }
   }
 
-  V? _removeHashTableEntry(var table, Object? key) {
+  V? _removeHashTableEntry(table, Object? key) {
     if (table == null) return null;
     LinkedHashMapCell? cell = _getTableCell(table, key);
     if (cell == null) return null;
@@ -259,27 +259,27 @@ class JsLinkedHashMap<K, V> extends MapBase<K, V>
     _modified();
   }
 
-  static bool _isStringKey(var key) {
+  static bool _isStringKey(key) {
     return key is String;
   }
 
-  static bool _isNumericKey(var key) {
+  static bool _isNumericKey(key) {
     // Only treat unsigned 30-bit integers as numeric keys. This way,
     // we avoid converting them to strings when we use them as keys in
     // the JavaScript hash table object.
     return key is num && JS('bool', '(# & 0x3fffffff) === #', key, key);
   }
 
-  int internalComputeHashCode(var key) {
+  int internalComputeHashCode(key) {
     return bucketHashMask & key.hashCode;
   }
 
-  List<LinkedHashMapCell>? _getBucket(var table, var key) {
+  List<LinkedHashMapCell>? _getBucket(table, key) {
     var hash = internalComputeHashCode(key);
     return _getTableBucket(table, hash);
   }
 
-  int internalFindBucketIndex(var bucket, var key) {
+  int internalFindBucketIndex(bucket, key) {
     if (bucket == null) return -1;
     int length = JS('int', '#.length', bucket);
     for (int i = 0; i < length; i++) {
@@ -291,24 +291,24 @@ class JsLinkedHashMap<K, V> extends MapBase<K, V>
 
   String toString() => MapBase.mapToString(this);
 
-  LinkedHashMapCell? _getTableCell(var table, var key) {
+  LinkedHashMapCell? _getTableCell(table, key) {
     return JS('var', '#[#]', table, key);
   }
 
-  List<LinkedHashMapCell>? _getTableBucket(var table, var key) {
+  List<LinkedHashMapCell>? _getTableBucket(table, key) {
     return JS('var', '#[#]', table, key);
   }
 
-  void _setTableEntry(var table, var key, var value) {
+  void _setTableEntry(table, key, value) {
     assert(value != null);
     JS('void', '#[#] = #', table, key, value);
   }
 
-  void _deleteTableEntry(var table, var key) {
+  void _deleteTableEntry(table, key) {
     JS('void', 'delete #[#]', table, key);
   }
 
-  bool _containsTableEntry(var table, var key) {
+  bool _containsTableEntry(table, key) {
     LinkedHashMapCell? cell = _getTableCell(table, key);
     return cell != null;
   }
@@ -493,11 +493,11 @@ class LinkedHashMapEntryIterator<K, V> implements Iterator<MapEntry<K, V>> {
 base class JsIdentityLinkedHashMap<K, V> extends JsLinkedHashMap<K, V> {
   JsIdentityLinkedHashMap();
 
-  int internalComputeHashCode(var key) {
+  int internalComputeHashCode(key) {
     return JsLinkedHashMap.bucketHashMask & identityHashCode(key);
   }
 
-  int internalFindBucketIndex(var bucket, var key) {
+  int internalFindBucketIndex(bucket, key) {
     if (bucket == null) return -1;
     int length = JS('int', '#.length', bucket);
     for (int i = 0; i < length; i++) {
@@ -514,11 +514,11 @@ base class JsIdentityLinkedHashMap<K, V> extends JsLinkedHashMap<K, V> {
 base class JsConstantLinkedHashMap<K, V> extends JsLinkedHashMap<K, V> {
   JsConstantLinkedHashMap();
 
-  int internalComputeHashCode(var key) {
+  int internalComputeHashCode(key) {
     return JsLinkedHashMap.bucketHashMask & constantHashCode(key);
   }
 
-  int internalFindBucketIndex(var bucket, var key) {
+  int internalFindBucketIndex(bucket, key) {
     if (bucket == null) return -1;
     int length = JS('int', '#.length', bucket);
     for (int i = 0; i < length; i++) {
diff --git a/sdk/lib/_internal/js_runtime/lib/native_helper.dart b/sdk/lib/_internal/js_runtime/lib/native_helper.dart
index 6b37fc0d6a4..feaa5a3d8d6 100644
--- a/sdk/lib/_internal/js_runtime/lib/native_helper.dart
+++ b/sdk/lib/_internal/js_runtime/lib/native_helper.dart
@@ -18,23 +18,23 @@ arrayGet(List array, int index) {
   return JS('var', '#[#]', array, index);
 }
 
-void arraySet(List array, int index, var value) {
+void arraySet(List array, int index, value) {
   JS('var', '#[#] = #', array, index, value);
 }
 
-propertyGet(var object, String property) {
+propertyGet(object, String property) {
   return JS('var', '#[#]', object, property);
 }
 
-bool callHasOwnProperty(var function, var object, String property) {
+bool callHasOwnProperty(function, object, String property) {
   return JS('bool', '#.call(#, #)', function, object, property);
 }
 
-void propertySet(var object, String property, var value) {
+void propertySet(object, String property, value) {
   JS('var', '#[#] = #', object, property, value);
 }
 
-getPropertyFromPrototype(var object, String name) {
+getPropertyFromPrototype(object, String name) {
   return JS('var', 'Object.getPrototypeOf(#)[#]', object, name);
 }
 
@@ -55,7 +55,7 @@ Function? alternateTagFunction;
 /// constructor is to be avoided.  Initialized by [initHooks].
 Function? prototypeForTagFunction;
 
-String toStringForNativeObject(var obj) {
+String toStringForNativeObject(obj) {
   // TODO(sra): Is this code dead?
   // [getTagFunction] might be uninitialized, but in usual usage, toString has
   // been called via an interceptor and initialized it.
@@ -68,7 +68,7 @@ String toStringForNativeObject(var obj) {
 int hashCodeForNativeObject(object) => Primitives.objectHashCode(object);
 
 /// Sets a JavaScript property on an object.
-void defineProperty(var obj, String property, var value) {
+void defineProperty(obj, String property, value) {
   JS(
     'void',
     'Object.defineProperty(#, #, '
diff --git a/sdk/lib/_internal/vm/bin/namespace_patch.dart b/sdk/lib/_internal/vm/bin/namespace_patch.dart
index 7ce21b41609..14adcc0846d 100644
--- a/sdk/lib/_internal/vm/bin/namespace_patch.dart
+++ b/sdk/lib/_internal/vm/bin/namespace_patch.dart
@@ -10,7 +10,7 @@ base class _NamespaceImpl extends NativeFieldWrapperClass1
   _NamespaceImpl._();
 
   @pragma("vm:external-name", "Namespace_Create")
-  external static _NamespaceImpl _create(_NamespaceImpl namespace, var n);
+  external static _NamespaceImpl _create(_NamespaceImpl namespace, n);
   @pragma("vm:external-name", "Namespace_GetPointer")
   external static int _getPointer(_NamespaceImpl namespace);
   @pragma("vm:external-name", "Namespace_GetDefault")
@@ -19,7 +19,7 @@ base class _NamespaceImpl extends NativeFieldWrapperClass1
   // If the platform supports "namespaces", this method is called by the
   // embedder with the platform-specific namespace information.
   static _NamespaceImpl? _cachedNamespace = null;
-  static void _setupNamespace(var namespace) {
+  static void _setupNamespace(namespace) {
     _cachedNamespace = _create(_NamespaceImpl._(), namespace);
   }
 
@@ -40,7 +40,7 @@ base class _NamespaceImpl extends NativeFieldWrapperClass1
 class _Namespace {
   @patch
   @pragma("vm:entry-point", "call")
-  static void _setupNamespace(var namespace) {
+  static void _setupNamespace(namespace) {
     _NamespaceImpl._setupNamespace(namespace);
   }
 
diff --git a/sdk/lib/_internal/vm/bin/resident_compiler_utils.dart b/sdk/lib/_internal/vm/bin/resident_compiler_utils.dart
index e3208834d4b..6b0967ceb1a 100644
--- a/sdk/lib/_internal/vm/bin/resident_compiler_utils.dart
+++ b/sdk/lib/_internal/vm/bin/resident_compiler_utils.dart
@@ -16,7 +16,7 @@ String maybeUriToFilename(String maybeUri) {
 
 /// Joins [a] and [b] with a backslash if [Platform.isWindows] is true,
 /// otherwise joins [a] and [b] with a slash.
-String joinPathComponents(final String a, final String b) =>
+String joinPathComponents(String a, String b) =>
     !Platform.isWindows ? '$a/$b' : '$a\\$b';
 
 /// The user's home directory for the current platform, or [null] if it can't be
diff --git a/sdk/lib/_internal/vm/bin/vmservice_io.dart b/sdk/lib/_internal/vm/bin/vmservice_io.dart
index 88f5b29f9e5..c71e608f51f 100644
--- a/sdk/lib/_internal/vm/bin/vmservice_io.dart
+++ b/sdk/lib/_internal/vm/bin/vmservice_io.dart
@@ -74,7 +74,7 @@ void _populateResidentCompilerInfoFile(
   /// was supplied on the command line, the CLI argument should be forwarded as
   /// the argument to this parameter. If neither option was supplied, the
   /// argument to this parameter should be [null].
-  final String? residentCompilerInfoFilePathArgumentFromCli,
+  String? residentCompilerInfoFilePathArgumentFromCli,
 ) {
   _residentCompilerInfoFile = getResidentCompilerInfoFileConsideringArgsImpl(
     residentCompilerInfoFilePathArgumentFromCli,
diff --git a/sdk/lib/_internal/vm/lib/async_patch.dart b/sdk/lib/_internal/vm/lib/async_patch.dart
index 9e1446f30d2..6252ae6baea 100644
--- a/sdk/lib/_internal/vm/lib/async_patch.dart
+++ b/sdk/lib/_internal/vm/lib/async_patch.dart
@@ -23,7 +23,7 @@ external void _trySetStackTrace(Object error, StackTrace stackTrace);
 
 // This function is used when lowering `await for` statements.
 @pragma('dyn-module:language-impl:callable')
-void _asyncStarMoveNextHelper(var stream) {
+void _asyncStarMoveNextHelper(stream) {
   if (stream is! _StreamImpl) {
     return;
   }
diff --git a/sdk/lib/_internal/vm/lib/errors_patch.dart b/sdk/lib/_internal/vm/lib/errors_patch.dart
index 32c7241ae34..d88b0207251 100644
--- a/sdk/lib/_internal/vm/lib/errors_patch.dart
+++ b/sdk/lib/_internal/vm/lib/errors_patch.dart
@@ -274,7 +274,7 @@ class NoSuchMethodError {
       }
       var namedArguments = localInvocation.namedArguments;
       if (namedArguments != null) {
-        namedArguments.forEach((Symbol key, var value) {
+        namedArguments.forEach((Symbol key, value) {
           if (argumentCount > 0) {
             argumentsBuf.write(", ");
           }
diff --git a/sdk/lib/_internal/vm/lib/integers.dart b/sdk/lib/_internal/vm/lib/integers.dart
index af479437327..ad9a38f8646 100644
--- a/sdk/lib/_internal/vm/lib/integers.dart
+++ b/sdk/lib/_internal/vm/lib/integers.dart
@@ -597,7 +597,7 @@ final class _Smi extends _IntegerImplementation {
 
   // Find the number of decimal digits in a positive smi.
   // Never called with numbers < 100. These are handled before calling.
-  static int _positiveBase10Length(var smi) {
+  static int _positiveBase10Length(smi) {
     // A positive smi has length <= 19 if 63-bit,  <=10 if 31-bit.
     // Avoid comparing a 31-bit smi to a non-smi.
     if (smi < 1000) return 3;
@@ -658,7 +658,7 @@ final class _Smi extends _IntegerImplementation {
 
   // Find the number of decimal digits in a negative smi.
   // Never called with numbers > -100. These are handled before calling.
-  static int _negativeBase10Length(var negSmi) {
+  static int _negativeBase10Length(negSmi) {
     // A negative smi has length <= 19 if 63-bit, <=10 if 31-bit.
     // Avoid comparing a 31-bit smi to a non-smi.
     if (negSmi > -1000) return 3;
diff --git a/sdk/lib/_internal/vm/lib/isolate_patch.dart b/sdk/lib/_internal/vm/lib/isolate_patch.dart
index 08ac14d1eb4..aa15d0ed2e6 100644
--- a/sdk/lib/_internal/vm/lib/isolate_patch.dart
+++ b/sdk/lib/_internal/vm/lib/isolate_patch.dart
@@ -82,7 +82,7 @@ final class _ReceivePortImpl extends Stream implements ReceivePort {
   }
 
   StreamSubscription listen(
-    void onData(var message)?, {
+    void onData(message)?, {
     Function? onError,
     void onDone()?,
     bool? cancelOnError,
@@ -156,7 +156,7 @@ final class _RawReceivePort implements RawReceivePort {
   @pragma("vm:external-name", "RawReceivePort_getSendPort")
   external SendPort get sendPort;
 
-  bool operator ==(var other) {
+  bool operator ==(other) {
     return (other is _RawReceivePort) && (this._get_id() == other._get_id());
   }
 
@@ -182,7 +182,7 @@ final class _RawReceivePort implements RawReceivePort {
 
   // Called from the VM to dispatch a message.
   @pragma("vm:entry-point", "call")
-  static _handleMessage(int id, var message) {
+  static _handleMessage(int id, message) {
     final Function? handler = _portMap[id]?._handler;
     if (handler == null) {
       return null;
@@ -236,11 +236,11 @@ final class _SendPort implements SendPort {
 
   /*--- public interface ---*/
   @pragma("vm:entry-point", "call")
-  void send(var message) {
+  void send(message) {
     _sendInternal(message);
   }
 
-  bool operator ==(var other) {
+  bool operator ==(other) {
     return (other is _SendPort) && (this._get_id() == other._get_id());
   }
 
@@ -256,7 +256,7 @@ final class _SendPort implements SendPort {
 
   // Forward the implementation of sending messages to the VM.
   @pragma("vm:external-name", "SendPort_sendInternal_")
-  external void _sendInternal(var message);
+  external void _sendInternal(message);
 }
 
 typedef _UnaryFunction(Never args);
@@ -421,7 +421,7 @@ final class Isolate {
     SendPort readyPort,
     String uri,
     Function topLevelFunction,
-    var message,
+    message,
     bool paused,
     bool errorsAreFatal,
     SendPort? onExit,
@@ -434,7 +434,7 @@ final class Isolate {
   static Future<Isolate> spawnUri(
     Uri uri,
     List<String> args,
-    var message, {
+    message, {
     bool paused = false,
     SendPort? onExit,
     SendPort? onError,
@@ -576,7 +576,7 @@ final class Isolate {
     SendPort readyPort,
     String uri,
     List<String> args,
-    var message,
+    message,
     bool paused,
     SendPort? onExit,
     SendPort? onError,
diff --git a/sdk/lib/_internal/vm/lib/string_patch.dart b/sdk/lib/_internal/vm/lib/string_patch.dart
index 5af24be8e3f..a9d34e7e3e4 100644
--- a/sdk/lib/_internal/vm/lib/string_patch.dart
+++ b/sdk/lib/_internal/vm/lib/string_patch.dart
@@ -879,7 +879,7 @@ abstract final class _StringBase implements String {
   @pragma("vm:recognized", "other")
   @pragma("vm:entry-point", "call")
   @pragma("vm:never-inline")
-  static String _interpolate(final List values) {
+  static String _interpolate(List values) {
     final numValues = values.length;
     int totalLength = 0;
     int i = 0;
diff --git a/sdk/lib/_internal/wasm/lib/boxed_double.dart b/sdk/lib/_internal/wasm/lib/boxed_double.dart
index 2ef0d1f4289..a4cddbb1cdf 100644
--- a/sdk/lib/_internal/wasm/lib/boxed_double.dart
+++ b/sdk/lib/_internal/wasm/lib/boxed_double.dart
@@ -261,7 +261,7 @@ final class BoxedDouble implements double {
     return _roundToDouble(this);
   }
 
-  static double _roundToDouble(final double d) {
+  static double _roundToDouble(double d) {
     final int bits = doubleToIntBits(d);
     final int exponent = (bits >> _mantissaBits) & ((1 << _exponentBits) - 1);
 
diff --git a/sdk/lib/_internal/wasm/lib/errors_patch.dart b/sdk/lib/_internal/wasm/lib/errors_patch.dart
index d0d77c12f80..18fb46998c5 100644
--- a/sdk/lib/_internal/wasm/lib/errors_patch.dart
+++ b/sdk/lib/_internal/wasm/lib/errors_patch.dart
@@ -212,7 +212,7 @@ class NoSuchMethodError {
     }
     Map<Symbol, dynamic>? namedArguments = _namedArguments;
     if (namedArguments != null) {
-      namedArguments.forEach((Symbol key, var value) {
+      namedArguments.forEach((Symbol key, value) {
         sb.write(comma);
         sb.write(_symbolToString(key));
         sb.write(": ");
diff --git a/sdk/lib/_internal/wasm/lib/io_patch.dart b/sdk/lib/_internal/wasm/lib/io_patch.dart
index 0810157d67d..91c41636be8 100644
--- a/sdk/lib/_internal/wasm/lib/io_patch.dart
+++ b/sdk/lib/_internal/wasm/lib/io_patch.dart
@@ -199,7 +199,7 @@ class _File {
 @patch
 class _Namespace {
   @patch
-  static void _setupNamespace(var namespace) {
+  static void _setupNamespace(namespace) {
     throw UnsupportedError("_Namespace");
   }
 
diff --git a/sdk/lib/_internal/wasm/lib/isolate_patch.dart b/sdk/lib/_internal/wasm/lib/isolate_patch.dart
index 8d0b3fb0f59..ce678017708 100644
--- a/sdk/lib/_internal/wasm/lib/isolate_patch.dart
+++ b/sdk/lib/_internal/wasm/lib/isolate_patch.dart
@@ -57,7 +57,7 @@ class Isolate {
   static Future<Isolate> spawnUri(
     Uri uri,
     List<String> args,
-    var message, {
+    message, {
     bool paused = false,
     SendPort? onExit,
     SendPort? onError,
diff --git a/sdk/lib/async/stream_impl.dart b/sdk/lib/async/stream_impl.dart
index 65256ced0e4..9bb5a9a9534 100644
--- a/sdk/lib/async/stream_impl.dart
+++ b/sdk/lib/async/stream_impl.dart
@@ -1030,7 +1030,7 @@ class _StreamIterator<T> implements StreamIterator<T> {
   bool _hasValue = false;
 
   @pragma('dyn-module:language-impl:callable')
-  _StreamIterator(final Stream<T> stream)
+  _StreamIterator(Stream<T> stream)
     : _stateData = checkNotNullable(stream, "stream");
 
   T get current {
diff --git a/sdk/lib/core/errors.dart b/sdk/lib/core/errors.dart
index 5500c746d09..9c88ec5eb86 100644
--- a/sdk/lib/core/errors.dart
+++ b/sdk/lib/core/errors.dart
@@ -252,7 +252,7 @@ class RangeError extends ArgumentError {
   // It currently isn't in all cases.
   /// Create a new [RangeError] with the given [message].
   @pragma("vm:entry-point")
-  RangeError(var message) : start = null, end = null, super(message);
+  RangeError(message) : start = null, end = null, super(message);
 
   /// Create a new [RangeError] with a message for the given [value].
   ///
diff --git a/sdk/lib/core/exceptions.dart b/sdk/lib/core/exceptions.dart
index fb3e6346130..6f317d6259b 100644
--- a/sdk/lib/core/exceptions.dart
+++ b/sdk/lib/core/exceptions.dart
@@ -21,7 +21,7 @@ part of "dart:core";
 /// and its subclasses.
 @pragma('flutter:keep-to-string-in-subtypes')
 abstract interface class Exception {
-  factory Exception([var message]) => _Exception(message);
+  factory Exception([message]) => _Exception(message);
 }
 
 /// Default implementation of [Exception] which carries a message.
diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index c3b56fb5940..ecffe482236 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -36999,7 +36999,7 @@ abstract class WindowBase implements EventTarget {
    *   from WHATWG.
    */
   void postMessage(
-    var message,
+    message,
     String targetOrigin, [
     List<MessagePort>? messagePorts,
   ]);
@@ -39853,7 +39853,7 @@ class _KeyboardEventHandler extends EventStreamProvider<KeyEvent> {
 
   /** Determine if caps lock is one of the currently depressed keys. */
   bool get _capsLockOn =>
-      _keyDownList.any((var element) => element.keyCode == KeyCode.CAPS_LOCK);
+      _keyDownList.any((element) => element.keyCode == KeyCode.CAPS_LOCK);
 
   /**
    * Given the previously recorded keydown key codes, see if we can determine
@@ -40092,7 +40092,7 @@ class _KeyboardEventHandler extends EventStreamProvider<KeyEvent> {
       // keyCode/which for non printable keys.
       e._shadowKeyCode = _keyIdentifier[e._shadowKeyIdentifier]!;
     }
-    e._shadowAltKey = _keyDownList.any((var element) => element.altKey);
+    e._shadowAltKey = _keyDownList.any((element) => element.altKey);
     _stream.add(e);
   }
 
@@ -41114,7 +41114,7 @@ class _DOMWindowCrossFrame implements WindowBase {
   // Methods.
   void close() => JS('void', '#.close()', _window);
 
-  void postMessage(var message, String targetOrigin, [List? messagePorts]) {
+  void postMessage(message, String targetOrigin, [List? messagePorts]) {
     if (messagePorts == null) {
       JS(
         'void',
diff --git a/sdk/lib/io/namespace_impl.dart b/sdk/lib/io/namespace_impl.dart
index 99b6add45fe..06c4d003010 100644
--- a/sdk/lib/io/namespace_impl.dart
+++ b/sdk/lib/io/namespace_impl.dart
@@ -20,5 +20,5 @@ abstract class _Namespace {
   // relative to the process's current working directory and absolute paths will
   // be left relative to the file system root.
   @pragma("vm:entry-point")
-  external static void _setupNamespace(var namespace);
+  external static void _setupNamespace(namespace);
 }
diff --git a/sdk/lib/io/network_profiling.dart b/sdk/lib/io/network_profiling.dart
index a1b2a4a85a0..270ddd5a897 100644
--- a/sdk/lib/io/network_profiling.dart
+++ b/sdk/lib/io/network_profiling.dart
@@ -99,7 +99,7 @@ abstract class _NetworkProfiling {
               ...HttpProfiler.serializeHttpProfileRequests(updatedSince),
               ...getHttpClientProfilingData()
                   .where(
-                    (final Map<String, Object?> p) =>
+                    (Map<String, Object?> p) =>
                         updatedSince == null ||
                         (p['_lastUpdateTime'] as int) >= updatedSince,
                   )
diff --git a/sdk/lib/isolate/isolate.dart b/sdk/lib/isolate/isolate.dart
index 03b963b5056..8e4cb2b6e6a 100644
--- a/sdk/lib/isolate/isolate.dart
+++ b/sdk/lib/isolate/isolate.dart
@@ -546,7 +546,7 @@ final class Isolate {
   external static Future<Isolate> spawnUri(
     Uri uri,
     List<String> args,
-    var message, {
+    message, {
     bool paused = false,
     SendPort? onExit,
     SendPort? onError,
@@ -906,7 +906,7 @@ abstract interface class SendPort implements Capability {
 
   /// Tests whether [other] is a [SendPort] pointing to the same
   /// [ReceivePort] as this one.
-  bool operator ==(var other);
+  bool operator ==(other);
 
   /// A hash code for this send port that is consistent with the == operator.
   int get hashCode;
@@ -955,7 +955,7 @@ abstract interface class ReceivePort implements Stream<dynamic> {
   /// The [onDone] handler will be called when the stream closes.
   /// The stream closes when [close] is called.
   StreamSubscription<dynamic> listen(
-    void onData(var message)?, {
+    void onData(message)?, {
     Function? onError,
     void onDone()?,
     bool? cancelOnError,
diff --git a/tools/dom/src/CrossFrameTypes.dart b/tools/dom/src/CrossFrameTypes.dart
index 72113cff0f4..d1e204bc316 100644
--- a/tools/dom/src/CrossFrameTypes.dart
+++ b/tools/dom/src/CrossFrameTypes.dart
@@ -144,7 +144,7 @@ abstract class WindowBase implements EventTarget {
    * * [Cross-document messaging](https://html.spec.whatwg.org/multipage/comms.html#web-messaging)
    *   from WHATWG.
    */
-  void postMessage(var message, String targetOrigin,
+  void postMessage(message, String targetOrigin,
       [List<MessagePort>? messagePorts]);
 }
 
diff --git a/tools/dom/src/KeyboardEventStream.dart b/tools/dom/src/KeyboardEventStream.dart
index db3b1cf21ef..2812d58c0d8 100644
--- a/tools/dom/src/KeyboardEventStream.dart
+++ b/tools/dom/src/KeyboardEventStream.dart
@@ -100,7 +100,7 @@ class _KeyboardEventHandler extends EventStreamProvider<KeyEvent> {
 
   /** Determine if caps lock is one of the currently depressed keys. */
   bool get _capsLockOn =>
-      _keyDownList.any((var element) => element.keyCode == KeyCode.CAPS_LOCK);
+      _keyDownList.any((element) => element.keyCode == KeyCode.CAPS_LOCK);
 
   /**
    * Given the previously recorded keydown key codes, see if we can determine
@@ -339,7 +339,7 @@ class _KeyboardEventHandler extends EventStreamProvider<KeyEvent> {
       // keyCode/which for non printable keys.
       e._shadowKeyCode = _keyIdentifier[e._shadowKeyIdentifier]!;
     }
-    e._shadowAltKey = _keyDownList.any((var element) => element.altKey);
+    e._shadowAltKey = _keyDownList.any((element) => element.altKey);
     _stream.add(e);
   }
 
diff --git a/tools/dom/src/_chrome/utils.dart b/tools/dom/src/_chrome/utils.dart
index a06085d14e9..6c650564238 100644
--- a/tools/dom/src/_chrome/utils.dart
+++ b/tools/dom/src/_chrome/utils.dart
@@ -70,7 +70,7 @@ List _convertListArgument(List argument) {
  *
  * Cannot be used for functions.
  */
-Object convertArgument(var argument) {
+Object convertArgument(argument) {
   if (argument == null) return argument;
 
   if (argument is num || argument is String || argument is bool)
diff --git a/tools/dom/src/dart2js_DOMImplementation.dart b/tools/dom/src/dart2js_DOMImplementation.dart
index a4cf1aca8c2..dd29369a163 100644
--- a/tools/dom/src/dart2js_DOMImplementation.dart
+++ b/tools/dom/src/dart2js_DOMImplementation.dart
@@ -42,7 +42,7 @@ class _DOMWindowCrossFrame implements WindowBase {
   // Methods.
   void close() => JS('void', '#.close()', _window);
 
-  void postMessage(var message, String targetOrigin, [List? messagePorts]) {
+  void postMessage(message, String targetOrigin, [List? messagePorts]) {
     if (messagePorts == null) {
       JS('void', '#.postMessage(#,#)', _window,
           convertDartToNative_SerializedScriptValue(message), targetOrigin);
diff --git a/utils/compiler/create_snapshot_entry.dart b/utils/compiler/create_snapshot_entry.dart
index b3b7ab3c6b5..7d1c6c5ca02 100644
--- a/utils/compiler/create_snapshot_entry.dart
+++ b/utils/compiler/create_snapshot_entry.dart
@@ -9,7 +9,7 @@
 import 'dart:io';
 import 'dart:async';
 
-Future<String> getVersion(var rootPath, bool noGitHash) {
+Future<String> getVersion(rootPath, bool noGitHash) {
   var printVersionScript = rootPath.resolve("tools/make_version.py");
   var args = <String>[
     printVersionScript.toFilePath(),
@@ -25,7 +25,7 @@ Future<String> getVersion(var rootPath, bool noGitHash) {
   });
 }
 
-Future<String> getDart2jsSnapshotGenerationFile(var rootPath, bool noGitHash) {
+Future<String> getDart2jsSnapshotGenerationFile(rootPath, bool noGitHash) {
   return getVersion(rootPath, noGitHash).then((version) {
     var snapshotGenerationText =
         """