diff --git a/.gitignore b/.gitignore
index 2c61888e5..0abc5ef70 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,5 +15,6 @@ node_modules/
 /doc/api
 /pkg/*/doc/api
 
-# Generated protocol buffer files.
+# Generated Dart files.
 *.pb*.dart
+*.g.dart
diff --git a/.pubignore b/.pubignore
index 2fbab300a..08992ce75 100644
--- a/.pubignore
+++ b/.pubignore
@@ -1,5 +1,5 @@
 # This should be identical to .gitignore except that it doesn't exclude
-# generated protobuf files.
+# generated Dart files.
 
 .buildlog
 .DS_Store
diff --git a/lib/sass.dart b/lib/sass.dart
index eb58adc4f..b9aaa0a1c 100644
--- a/lib/sass.dart
+++ b/lib/sass.dart
@@ -13,7 +13,7 @@ import 'src/async_import_cache.dart';
 import 'src/callable.dart';
 import 'src/compile.dart' as c;
 import 'src/compile_result.dart';
-import 'src/deprecation.dart';
+import 'src/deprecation.g.dart';
 import 'src/exception.dart';
 import 'src/import_cache.dart';
 import 'src/importer.dart';
@@ -25,7 +25,7 @@ import 'src/visitor/serialize.dart';
 
 export 'src/callable.dart' show Callable, AsyncCallable;
 export 'src/compile_result.dart';
-export 'src/deprecation.dart';
+export 'src/deprecation.g.dart';
 export 'src/exception.dart' show SassException;
 export 'src/importer.dart';
 export 'src/logger.dart' show Logger;
diff --git a/lib/src/ast/selector.dart b/lib/src/ast/selector.dart
index 953ccf7aa..05f44fcdc 100644
--- a/lib/src/ast/selector.dart
+++ b/lib/src/ast/selector.dart
@@ -5,7 +5,7 @@
 import 'package:meta/meta.dart';
 import 'package:source_span/source_span.dart';
 
-import '../deprecation.dart';
+import '../deprecation.g.dart';
 import '../evaluation_context.dart';
 import '../exception.dart';
 import '../visitor/any_selector.dart';
diff --git a/lib/src/async_compile.dart b/lib/src/async_compile.dart
index 063f3d2dc..b7e96f97e 100644
--- a/lib/src/async_compile.dart
+++ b/lib/src/async_compile.dart
@@ -11,7 +11,7 @@ import 'ast/sass.dart';
 import 'async_import_cache.dart';
 import 'callable.dart';
 import 'compile_result.dart';
-import 'deprecation.dart';
+import 'deprecation.g.dart';
 import 'importer.dart';
 import 'importer/legacy_node.dart';
 import 'importer/no_op.dart';
diff --git a/lib/src/async_import_cache.dart b/lib/src/async_import_cache.dart
index 6d6e4fa8c..1513cb2e6 100644
--- a/lib/src/async_import_cache.dart
+++ b/lib/src/async_import_cache.dart
@@ -9,7 +9,7 @@ import 'package:package_config/package_config_types.dart';
 import 'package:path/path.dart' as p;
 
 import 'ast/sass.dart';
-import 'deprecation.dart';
+import 'deprecation.g.dart';
 import 'importer.dart';
 import 'importer/canonicalize_context.dart';
 import 'importer/no_op.dart';
diff --git a/lib/src/compile.dart b/lib/src/compile.dart
index 5a7fe54f2..58e20b773 100644
--- a/lib/src/compile.dart
+++ b/lib/src/compile.dart
@@ -20,7 +20,7 @@ import 'ast/sass.dart';
 import 'import_cache.dart';
 import 'callable.dart';
 import 'compile_result.dart';
-import 'deprecation.dart';
+import 'deprecation.g.dart';
 import 'importer.dart';
 import 'importer/legacy_node.dart';
 import 'importer/no_op.dart';
diff --git a/lib/src/embedded/logger.dart b/lib/src/embedded/logger.dart
index dd1f2a223..fff3c5128 100644
--- a/lib/src/embedded/logger.dart
+++ b/lib/src/embedded/logger.dart
@@ -6,7 +6,7 @@ import 'package:path/path.dart' as p;
 import 'package:source_span/source_span.dart';
 import 'package:stack_trace/stack_trace.dart';
 
-import '../deprecation.dart';
+import '../deprecation.g.dart';
 import '../logger.dart';
 import '../util/nullable.dart';
 import '../utils.dart';
diff --git a/lib/src/evaluation_context.dart b/lib/src/evaluation_context.dart
index 30b3852f9..fe957707d 100644
--- a/lib/src/evaluation_context.dart
+++ b/lib/src/evaluation_context.dart
@@ -6,7 +6,7 @@ import 'dart:async';
 
 import 'package:source_span/source_span.dart';
 
-import 'deprecation.dart';
+import 'deprecation.g.dart';
 import 'logger.dart';
 
 /// An interface that exposes information about the current Sass evaluation.
diff --git a/lib/src/functions/color.dart b/lib/src/functions/color.dart
index f71c8080f..85923db89 100644
--- a/lib/src/functions/color.dart
+++ b/lib/src/functions/color.dart
@@ -7,7 +7,7 @@ import 'dart:collection';
 import 'package:collection/collection.dart';
 
 import '../callable.dart';
-import '../deprecation.dart';
+import '../deprecation.g.dart';
 import '../evaluation_context.dart';
 import '../exception.dart';
 import '../module/built_in.dart';
diff --git a/lib/src/functions/math.dart b/lib/src/functions/math.dart
index bca609d0d..fc9df438a 100644
--- a/lib/src/functions/math.dart
+++ b/lib/src/functions/math.dart
@@ -8,7 +8,7 @@ import 'dart:math' as math;
 import 'package:collection/collection.dart';
 
 import '../callable.dart';
-import '../deprecation.dart';
+import '../deprecation.g.dart';
 import '../evaluation_context.dart';
 import '../exception.dart';
 import '../module/built_in.dart';
diff --git a/lib/src/import_cache.dart b/lib/src/import_cache.dart
index 9590b0e5a..8c27cae90 100644
--- a/lib/src/import_cache.dart
+++ b/lib/src/import_cache.dart
@@ -16,7 +16,7 @@ import 'package:package_config/package_config_types.dart';
 import 'package:path/path.dart' as p;
 
 import 'ast/sass.dart';
-import 'deprecation.dart';
+import 'deprecation.g.dart';
 import 'importer.dart';
 import 'importer/canonicalize_context.dart';
 import 'importer/no_op.dart';
diff --git a/lib/src/importer/filesystem.dart b/lib/src/importer/filesystem.dart
index cb23d3095..ae5f71797 100644
--- a/lib/src/importer/filesystem.dart
+++ b/lib/src/importer/filesystem.dart
@@ -5,7 +5,7 @@
 import 'package:meta/meta.dart';
 import 'package:path/path.dart' as p;
 
-import '../deprecation.dart';
+import '../deprecation.g.dart';
 import '../evaluation_context.dart';
 import '../importer.dart';
 import '../io.dart' as io;
diff --git a/lib/src/js/deprecations.dart b/lib/src/js/deprecations.dart
index 51e3aec1a..ac665a9e1 100644
--- a/lib/src/js/deprecations.dart
+++ b/lib/src/js/deprecations.dart
@@ -5,7 +5,7 @@
 import 'package:js/js.dart';
 import 'package:pub_semver/pub_semver.dart';
 
-import '../deprecation.dart' as dart show Deprecation;
+import '../deprecation.g.dart' as dart show Deprecation;
 import 'reflection.dart';
 
 @JS()
diff --git a/lib/src/logger.dart b/lib/src/logger.dart
index 7569b6e7c..d387931ac 100644
--- a/lib/src/logger.dart
+++ b/lib/src/logger.dart
@@ -6,7 +6,7 @@ import 'package:meta/meta.dart';
 import 'package:source_span/source_span.dart';
 import 'package:stack_trace/stack_trace.dart';
 
-import 'deprecation.dart';
+import 'deprecation.g.dart';
 import 'logger/deprecation_processing.dart';
 import 'logger/stderr.dart';
 
diff --git a/lib/src/logger/deprecation_processing.dart b/lib/src/logger/deprecation_processing.dart
index 37bd4464f..8d3199bdc 100644
--- a/lib/src/logger/deprecation_processing.dart
+++ b/lib/src/logger/deprecation_processing.dart
@@ -7,7 +7,7 @@ import 'package:pub_semver/pub_semver.dart';
 import 'package:source_span/source_span.dart';
 import 'package:stack_trace/stack_trace.dart';
 
-import '../deprecation.dart';
+import '../deprecation.g.dart';
 import '../exception.dart';
 import '../logger.dart';
 
diff --git a/lib/src/logger/js_to_dart.dart b/lib/src/logger/js_to_dart.dart
index 4a11bf546..eae14972d 100644
--- a/lib/src/logger/js_to_dart.dart
+++ b/lib/src/logger/js_to_dart.dart
@@ -7,7 +7,7 @@ import 'package:source_span/source_span.dart';
 import 'package:stack_trace/stack_trace.dart';
 import 'package:term_glyph/term_glyph.dart' as glyph;
 
-import '../deprecation.dart';
+import '../deprecation.g.dart';
 import '../logger.dart';
 import '../js/deprecations.dart' show deprecations;
 import '../js/logger.dart';
diff --git a/lib/src/parse/scss.dart b/lib/src/parse/scss.dart
index 67b5c0f4b..bce0416b5 100644
--- a/lib/src/parse/scss.dart
+++ b/lib/src/parse/scss.dart
@@ -5,7 +5,7 @@
 import 'package:charcode/charcode.dart';
 
 import '../ast/sass.dart';
-import '../deprecation.dart';
+import '../deprecation.g.dart';
 import '../interpolation_buffer.dart';
 import '../logger.dart';
 import '../util/character.dart';
diff --git a/lib/src/parse/stylesheet.dart b/lib/src/parse/stylesheet.dart
index e72e2527b..1d88aaf5c 100644
--- a/lib/src/parse/stylesheet.dart
+++ b/lib/src/parse/stylesheet.dart
@@ -10,7 +10,7 @@ import 'package:string_scanner/string_scanner.dart';
 
 import '../ast/sass.dart';
 import '../color_names.dart';
-import '../deprecation.dart';
+import '../deprecation.g.dart';
 import '../exception.dart';
 import '../interpolation_buffer.dart';
 import '../logger.dart';
@@ -235,7 +235,7 @@ abstract class StylesheetParser extends Parser {
         case 'default':
           if (guarded) {
             logger.warnForDeprecation(
-                Deprecation.duplicateVariableFlags,
+                Deprecation.duplicateVarFlags,
                 '!default should only be written once for each variable.\n'
                 'This will be an error in Dart Sass 2.0.0.',
                 span: scanner.spanFrom(flagStart));
@@ -248,7 +248,7 @@ abstract class StylesheetParser extends Parser {
                 scanner.spanFrom(flagStart));
           } else if (global) {
             logger.warnForDeprecation(
-                Deprecation.duplicateVariableFlags,
+                Deprecation.duplicateVarFlags,
                 '!global should only be written once for each variable.\n'
                 'This will be an error in Dart Sass 2.0.0.',
                 span: scanner.spanFrom(flagStart));
diff --git a/lib/src/value.dart b/lib/src/value.dart
index 3149435a0..43f9d721d 100644
--- a/lib/src/value.dart
+++ b/lib/src/value.dart
@@ -5,7 +5,7 @@
 import 'package:meta/meta.dart';
 
 import 'ast/selector.dart';
-import 'deprecation.dart';
+import 'deprecation.g.dart';
 import 'evaluation_context.dart';
 import 'exception.dart';
 import 'utils.dart';
diff --git a/lib/src/value/calculation.dart b/lib/src/value/calculation.dart
index cbb8b92e6..46efe32ca 100644
--- a/lib/src/value/calculation.dart
+++ b/lib/src/value/calculation.dart
@@ -7,7 +7,7 @@ import 'dart:math' as math;
 import 'package:charcode/charcode.dart';
 import 'package:meta/meta.dart';
 
-import '../deprecation.dart';
+import '../deprecation.g.dart';
 import '../evaluation_context.dart';
 import '../exception.dart';
 import '../callable.dart';
diff --git a/lib/src/value/color.dart b/lib/src/value/color.dart
index 8df328564..0b31a174b 100644
--- a/lib/src/value/color.dart
+++ b/lib/src/value/color.dart
@@ -8,7 +8,7 @@ import 'package:cli_pkg/js.dart';
 import 'package:meta/meta.dart';
 import 'package:source_span/source_span.dart';
 
-import '../deprecation.dart';
+import '../deprecation.g.dart';
 import '../evaluation_context.dart';
 import '../exception.dart';
 import '../util/number.dart';
diff --git a/lib/src/visitor/async_evaluate.dart b/lib/src/visitor/async_evaluate.dart
index b8434ff47..5ee6f7099 100644
--- a/lib/src/visitor/async_evaluate.dart
+++ b/lib/src/visitor/async_evaluate.dart
@@ -24,7 +24,7 @@ import '../callable.dart';
 import '../color_names.dart';
 import '../configuration.dart';
 import '../configured_value.dart';
-import '../deprecation.dart';
+import '../deprecation.g.dart';
 import '../evaluation_context.dart';
 import '../exception.dart';
 import '../extend/extension_store.dart';
diff --git a/lib/src/visitor/evaluate.dart b/lib/src/visitor/evaluate.dart
index 1680be88e..4c31212fd 100644
--- a/lib/src/visitor/evaluate.dart
+++ b/lib/src/visitor/evaluate.dart
@@ -33,7 +33,7 @@ import '../callable.dart';
 import '../color_names.dart';
 import '../configuration.dart';
 import '../configured_value.dart';
-import '../deprecation.dart';
+import '../deprecation.g.dart';
 import '../evaluation_context.dart';
 import '../exception.dart';
 import '../extend/extension_store.dart';
diff --git a/tool/grind.dart b/tool/grind.dart
index 631bdebdf..11a8023bf 100644
--- a/tool/grind.dart
+++ b/tool/grind.dart
@@ -11,6 +11,7 @@ import 'package:grinder/grinder.dart';
 import 'package:path/path.dart' as p;
 import 'package:source_span/source_span.dart';
 
+import 'grind/generate_deprecations.dart';
 import 'grind/synchronize.dart';
 import 'grind/utils.dart';
 
@@ -140,7 +141,7 @@ void npmInstall() =>
     run(Platform.isWindows ? "npm.cmd" : "npm", arguments: ["install"]);
 
 @Task('Runs the tasks that are required for running tests.')
-@Depends(format, synchronize, protobuf, "pkg-npm-dev", npmInstall,
+@Depends(format, synchronize, protobuf, deprecations, "pkg-npm-dev", npmInstall,
     "pkg-standalone-dev")
 void beforeTest() {}
 
@@ -213,9 +214,9 @@ String _readAndResolveMarkdown(String path) => File(path)
 
 /// Returns a map from JS type declaration file names to their contnets.
 Map<String, String> _fetchJSTypes() {
-  var languageRepo = _updateLanguageRepo();
+  updateLanguageRepo();
 
-  var typeRoot = p.join(languageRepo, 'js-api-doc');
+  var typeRoot = p.join('build/language', 'js-api-doc');
   return {
     for (var entry in Directory(typeRoot).listSync(recursive: true))
       if (entry is File && entry.path.endsWith('.d.ts'))
@@ -231,6 +232,7 @@ void _matchError(Match match, String message, {Object? url}) {
 }
 
 @Task('Compile the protocol buffer definition to a Dart library.')
+@Depends(updateLanguageRepo)
 Future<void> protobuf() async {
   Directory('build').createSync(recursive: true);
 
@@ -250,8 +252,6 @@ dart run protoc_plugin "\$@"
     run('chmod', arguments: ['a+x', 'build/protoc-gen-dart']);
   }
 
-  _updateLanguageRepo();
-
   await runAsync("buf",
       arguments: ["generate"],
       runOptions: RunOptions(environment: {
@@ -261,6 +261,12 @@ dart run protoc_plugin "\$@"
       }));
 }
 
+@Task('Generate deprecation.g.dart from the list in the language repo.')
+@Depends(updateLanguageRepo)
+Future<void> deprecations() async {
+  updateDeprecationFile(File('build/language/spec/deprecations.yaml'));
+}
+
 /// After building the NPM package, add default exports to
 /// `build/npm/sass.node.mjs`.
 ///
@@ -322,18 +328,19 @@ String _updateHomebrewLanguageRevision(String formula) {
       formula.substring(match.end);
 }
 
-/// Clones the main branch of `github.com/sass/sass` and returns the path to the
-/// clone.
+/// Clones the main branch of `github.com/sass/sass`.
 ///
 /// If the `UPDATE_SASS_SASS_REPO` environment variable is `false`, this instead
 /// assumes the repo that already exists at `build/language/sass`.
 /// `UPDATE_SASS_PROTOCOL` is also checked as a deprecated alias for
 /// `UPDATE_SASS_SASS_REPO`.
-String _updateLanguageRepo() =>
-    // UPDATE_SASS_PROTOCOL is considered deprecated, because it doesn't apply as
-    // generically to other tasks.
-    Platform.environment['UPDATE_SASS_SASS_REPO'] != 'false' &&
-            Platform.environment['UPDATE_SASS_PROTOCOL'] != 'false'
-        ? cloneOrCheckout("https://github.com/sass/sass.git", "main",
-            name: 'language')
-        : 'build/language';
+@Task('Clones the main branch of `github.com/sass/sass` if necessary.')
+void updateLanguageRepo() {
+  // UPDATE_SASS_PROTOCOL is considered deprecated, because it doesn't apply as
+  // generically to other tasks.
+  if (Platform.environment['UPDATE_SASS_SASS_REPO'] != 'false' &&
+      Platform.environment['UPDATE_SASS_PROTOCOL'] != 'false') {
+    cloneOrCheckout("https://github.com/sass/sass.git", "main",
+        name: 'language');
+  }
+}
diff --git a/lib/src/deprecation.dart b/tool/grind/deprecation.dart.template
similarity index 51%
rename from lib/src/deprecation.dart
rename to tool/grind/deprecation.dart.template
index b13180e10..d05da5f9a 100644
--- a/lib/src/deprecation.dart
+++ b/tool/grind/deprecation.dart.template
@@ -1,7 +1,9 @@
-// Copyright 2022 Google LLC. Use of this source code is governed by an
+// Copyright 2024 Google LLC. Use of this source code is governed by an
 // MIT-style license that can be found in the LICENSE file or at
 // https://opensource.org/licenses/MIT.
 
+// CHECKSUM
+
 import 'package:cli_pkg/js.dart';
 import 'package:collection/collection.dart';
 import 'package:pub_semver/pub_semver.dart';
@@ -10,82 +12,17 @@ import 'util/nullable.dart';
 
 /// A deprecated feature in the language.
 enum Deprecation {
-  /// Deprecation for passing a string to `call` instead of `get-function`.
-  callString('call-string',
-      deprecatedIn: '0.0.0',
-      description: 'Passing a string directly to meta.call().'),
-
-  /// Deprecation for `@elseif`.
-  elseif('elseif', deprecatedIn: '1.3.2', description: '@elseif.'),
-
-  /// Deprecation for parsing `@-moz-document`.
-  mozDocument('moz-document',
-      deprecatedIn: '1.7.2', description: '@-moz-document.'),
-
-  /// Deprecation for importers using relative canonical URLs.
-  relativeCanonical('relative-canonical', deprecatedIn: '1.14.2'),
-
-  /// Deprecation for declaring new variables with `!global`.
-  newGlobal('new-global',
-      deprecatedIn: '1.17.2',
-      description: 'Declaring new variables with !global.'),
-
-  /// Deprecation for certain functions in the color module matching the
-  /// behavior of their global counterparts for compatiblity reasons.
-  colorModuleCompat('color-module-compat',
-      deprecatedIn: '1.23.0',
-      description:
-          'Using color module functions in place of plain CSS functions.'),
-
-  /// Deprecation for treating `/` as division.
-  slashDiv('slash-div',
-      deprecatedIn: '1.33.0', description: '/ operator for division.'),
-
-  /// Deprecation for leading, trailing, and repeated combinators.
-  bogusCombinators('bogus-combinators',
-      deprecatedIn: '1.54.0',
-      description: 'Leading, trailing, and repeated combinators.'),
-
-  /// Deprecation for ambiguous `+` and `-` operators.
-  strictUnary('strict-unary',
-      deprecatedIn: '1.55.0', description: 'Ambiguous + and - operators.'),
-
-  /// Deprecation for passing invalid units to certain built-in functions.
-  functionUnits('function-units',
-      deprecatedIn: '1.56.0',
-      description: 'Passing invalid units to built-in functions.'),
-
-  /// Deprecation for passing percentages to the Sass abs() function.
-  absPercent('abs-percent',
-      deprecatedIn: '1.65.0',
-      description: 'Passing percentages to the Sass abs() function.'),
-
-  duplicateVariableFlags('duplicate-var-flags',
-      deprecatedIn: '1.62.0',
-      description:
-          'Using !default or !global multiple times for one variable.'),
-
-  nullAlpha('null-alpha',
-      deprecatedIn: '1.62.3',
-      description: 'Passing null as alpha in the ${isJS ? 'JS' : 'Dart'} API.'),
-
-  fsImporterCwd('fs-importer-cwd',
-      deprecatedIn: '1.73.0',
-      description:
-          'Using the current working directory as an implicit load path.'),
-
-  cssFunctionMixin('css-function-mixin',
-      deprecatedIn: '1.76.0',
-      description: 'Function and mixin names beginning with --.'),
+  // REPLACE WITH AUTOGENERATED LIST
+
+  /// Used for deprecations coming from user-authored code.
+  userAuthored('user-authored', deprecatedIn: null),
 
   @Deprecated('This deprecation name was never actually used.')
-  calcInterp('calc-interp', deprecatedIn: null),
+  calcInterp('calc-interp', deprecatedIn: null);
 
-  /// Deprecation for `@import` rules.
-  import.future('import', description: '@import rules.'),
+  @Deprecated('Use duplicateVarFlags instead.')
+  static const duplicateVariableFlags = duplicateVarFlags;
 
-  /// Used for deprecations coming from user-authored code.
-  userAuthored('user-authored', deprecatedIn: null);
 
   /// A unique ID for this deprecation in kebab case.
   ///
diff --git a/tool/grind/generate_deprecations.dart b/tool/grind/generate_deprecations.dart
new file mode 100644
index 000000000..c3f416889
--- /dev/null
+++ b/tool/grind/generate_deprecations.dart
@@ -0,0 +1,66 @@
+// Copyright 2024 Google LLC. Use of this source code is governed by an
+// MIT-style license that can be found in the LICENSE file or at
+// https://opensource.org/licenses/MIT.
+
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:crypto/crypto.dart';
+import 'package:dart_style/dart_style.dart';
+import 'package:yaml/yaml.dart';
+
+void updateDeprecationFile(File yamlFile) {
+  var yamlText = yamlFile.readAsStringSync();
+  var data = loadYaml(yamlText) as Map;
+  var template =
+      File('tool/grind/deprecation.dart.template').readAsStringSync();
+  var buffer = StringBuffer();
+  for (var MapEntry(:String key, :value) in data.entries) {
+    var camelCase = key.replaceAllMapped(
+        RegExp(r'-(.)'), (match) => match.group(1)!.toUpperCase());
+    var (description, deprecatedIn, obsoleteIn) = switch (value) {
+      {
+        'description': String description,
+        'dart-sass': {'status': 'future'},
+      } =>
+        (description, null, null),
+      {
+        'description': String description,
+        'dart-sass': {'status': 'active', 'deprecated': String deprecatedIn},
+      } =>
+        (description, deprecatedIn, null),
+      {
+        'description': String description,
+        'dart-sass': {
+          'status': 'obsolete',
+          'deprecated': String deprecatedIn,
+          'obsolete': String obsoleteIn
+        },
+      } =>
+        (description, deprecatedIn, obsoleteIn),
+      _ => throw Exception('Invalid deprecation $key: $value')
+    };
+    description =
+        description.replaceAll(r'$PLATFORM', r"${isJS ? 'JS': 'Dart'}");
+    var constructorName = deprecatedIn == null ? '.future' : '';
+    var deprecatedClause =
+        deprecatedIn == null ? '' : "deprecatedIn: '$deprecatedIn', ";
+    var obsoleteClause =
+        obsoleteIn == null ? '' : "obsoleteIn: '$obsoleteIn', ";
+    var comment = 'Deprecation for ${description.substring(0, 1).toLowerCase()}'
+        '${description.substring(1)}';
+    buffer.writeln('/// $comment');
+    buffer.writeln(
+        "$camelCase$constructorName('$key', $deprecatedClause$obsoleteClause"
+        "description: '$description'),");
+  }
+  var code = template
+      .replaceFirst('// REPLACE WITH AUTOGENERATED LIST', buffer.toString())
+      .replaceFirst('// CHECKSUM',
+          '''// DO NOT EDIT. This file was generated from the spec repo.
+// See tool/grind/generate_deprecations.dart for details.
+//
+// Checksum: ${sha1.convert(utf8.encode(yamlText))}''');
+  File('lib/src/deprecation.g.dart')
+      .writeAsStringSync(DartFormatter().format(code));
+}