add a builder to clean up transitive digests (#3625)

Author: jakemac53

_test/test/goldens/generated_build_script.dart

@@ -136,11 +136,16 @@ final _builders = <_i1.BuilderApplication>[
     _i1.toAllPackages(),
     isOptional: true,
     hideOutput: true,
+    appliesBuilders: const [r'build_resolvers:transitive_digest_cleanup'],
   ),
   _i1.applyPostProcess(
     r'build_modules:module_cleanup',
     _i6.moduleCleanup,
   ),
+  _i1.applyPostProcess(
+    r'build_resolvers:transitive_digest_cleanup',
+    _i8.transitiveDigestCleanup,
+  ),
   _i1.applyPostProcess(
     r'build_web_compilers:dart2js_archive_extractor',
     _i3.dart2jsArchiveExtractor,

build_resolvers/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 2.4.2
+
+- Add a builder to clean up transitive digest files from the build output.
+
 ## 2.4.1
 
 - Fix an issue where deleted files were not removed from the analysis engine,

build_resolvers/build.yaml

@@ -10,3 +10,9 @@ builders:
     is_optional: True
     required_inputs: [".dart"]
     build_to: cache
+    applies_builders:
+      - :transitive_digest_cleanup
+post_process_builders:
+  transitive_digest_cleanup:
+    import: "package:build_resolvers/builder.dart"
+    builder_factory: transitiveDigestCleanup

build_resolvers/lib/builder.dart

@@ -12,6 +12,10 @@ import 'src/build_asset_uri_resolver.dart';
 
 Builder transitiveDigestsBuilder(_) => _TransitiveDigestsBuilder();
 
+PostProcessBuilder transitiveDigestCleanup(BuilderOptions options) =>
+    FileDeletingBuilder([transitiveDigestExtension],
+        isEnabled: options.config['enabled'] as bool? ?? true);
+
 /// Computes a digest comprised of the current libraries digest as well as its
 /// transitive dependency digests, and writes it to a file next to the library.
 ///

build_resolvers/pubspec.yaml

@@ -1,5 +1,5 @@
 name: build_resolvers
-version: 2.4.1
+version: 2.4.2
 description: Resolve Dart code in a Builder
 repository: https://github.com/dart-lang/build/tree/master/build_resolvers