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[flutter_tools] Support flavors and transformers for shaders#181889

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Laurie-Lin:pr/shader-transformers
Mar 13, 2026
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[flutter_tools] Support flavors and transformers for shaders#181889
auto-submit[bot] merged 6 commits intoflutter:masterfrom
Laurie-Lin:pr/shader-transformers

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@Laurie-Lin Laurie-Lin commented Feb 4, 2026 •
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This PR adds support for transformers on entries under flutter: shaders: in pubspec.yaml, bringing it closer to the existing assets entry model.

When a shader entry declares transformers, Flutter tools will run the transformer chain prior to shader compilation (Impeller/impellerc). This is wired through the build/bundle paths as well as DevFS shader recompilation during hot reload, so transformed sources are consistently used.

Fixes #181888

Testing

cd $FLUTTER_ROOT/packages/flutter_tools
../../bin/flutter test test/general.shard/flutter_manifest_test.dart test/general.shard/build_system/targets/assets_test.dart -r expanded

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@github-actions github-actions bot added the tool Affects the "flutter" command-line tool. See also t: labels. label Feb 4, 2026
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Code Review

This pull request adds support for transformers to shader entries in pubspec.yaml, aligning them with the existing asset entry model. The changes correctly wire this through the build/bundle paths and DevFS for hot reload. The implementation is solid and well-tested. My main feedback is to address some code duplication in the shader transformation logic to improve maintainability.

@Laurie-Lin Laurie-Lin mentioned this pull request Feb 4, 2026
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@bkonyi bkonyi requested review from bkonyi and chingjun February 9, 2026 15:51
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bkonyi commented Feb 9, 2026

Thanks for your contribution, @Laurie-Lin!

This LGTM overall (although there are some analysis failures that need to be resolved), but we'll need a second set of eyes on this before it can be approved.

chingjun
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Mostly LGTM other than stricter input check needed.

Also, can we add tests for the changes in bundle_builder.dart and devfs.dart? Thanks!

@Laurie-Lin Laurie-Lin changed the title flutter_tools: support transformers for flutter.shaders [flutter_tools] Support flavors and transformers for shaders Feb 11, 2026
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bkonyi commented Feb 24, 2026

Thanks for adding flavors and platform support here!

There's some analysis failures that need to be resolved, but this looks good to me once they're resolved:

   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/lib/src/build_system/targets/assets.dart:157:15 • omit_obvious_local_variable_types
   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/lib/src/build_system/targets/assets.dart:160:23 • omit_obvious_local_variable_types
   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/lib/src/bundle_builder.dart:208:15 • omit_obvious_local_variable_types
   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/lib/src/bundle_builder.dart:210:23 • omit_obvious_local_variable_types
   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart:244:17 • omit_obvious_local_variable_types
   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart:300:17 • omit_obvious_local_variable_types
   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart:360:17 • omit_obvious_local_variable_types
   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart:511:13 • omit_obvious_local_variable_types
   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart:546:15 • omit_obvious_local_variable_types
   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart:583:26 • omit_obvious_local_variable_types
   info • Unnecessary use of a null check ('!') • packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart:597:59 • unnecessary_null_checks
   info • Unnecessary use of a null check ('!') • packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart:601:41 • unnecessary_null_checks
   info • Unnecessary use of a null check ('!') • packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart:602:46 • unnecessary_null_checks

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Laurie-Lin commented Mar 10, 2026

Thanks for adding flavors and platform support here!

There's some analysis failures that need to be resolved, but this looks good to me once they're resolved:

   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/lib/src/build_system/targets/assets.dart:157:15 • omit_obvious_local_variable_types
   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/lib/src/build_system/targets/assets.dart:160:23 • omit_obvious_local_variable_types
   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/lib/src/bundle_builder.dart:208:15 • omit_obvious_local_variable_types
   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/lib/src/bundle_builder.dart:210:23 • omit_obvious_local_variable_types
   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart:244:17 • omit_obvious_local_variable_types
   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart:300:17 • omit_obvious_local_variable_types
   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart:360:17 • omit_obvious_local_variable_types
   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart:511:13 • omit_obvious_local_variable_types
   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart:546:15 • omit_obvious_local_variable_types
   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart:583:26 • omit_obvious_local_variable_types
   info • Unnecessary use of a null check ('!') • packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart:597:59 • unnecessary_null_checks
   info • Unnecessary use of a null check ('!') • packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart:601:41 • unnecessary_null_checks
   info • Unnecessary use of a null check ('!') • packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart:602:46 • unnecessary_null_checks

OK, I'm starting to work on fixing these warnings.

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Laurie-Lin commented Mar 10, 2026 •
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Thanks for adding flavors and platform support here!

There's some analysis failures that need to be resolved, but this looks good to me once they're resolved:

   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/lib/src/build_system/targets/assets.dart:157:15 • omit_obvious_local_variable_types
   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/lib/src/build_system/targets/assets.dart:160:23 • omit_obvious_local_variable_types
   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/lib/src/bundle_builder.dart:208:15 • omit_obvious_local_variable_types
   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/lib/src/bundle_builder.dart:210:23 • omit_obvious_local_variable_types
   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart:244:17 • omit_obvious_local_variable_types
   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart:300:17 • omit_obvious_local_variable_types
   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart:360:17 • omit_obvious_local_variable_types
   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart:511:13 • omit_obvious_local_variable_types
   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart:546:15 • omit_obvious_local_variable_types
   info • Omit the type annotation on a local variable when the type is obvious • packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart:583:26 • omit_obvious_local_variable_types
   info • Unnecessary use of a null check ('!') • packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart:597:59 • unnecessary_null_checks
   info • Unnecessary use of a null check ('!') • packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart:601:41 • unnecessary_null_checks
   info • Unnecessary use of a null check ('!') • packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart:602:46 • unnecessary_null_checks

Done, I fixed the analysis issues and reran targeted analysis on the affected files.

# dart analyze \
  packages/flutter_tools/lib/src/build_system/targets/assets.dart \
  packages/flutter_tools/lib/src/bundle_builder.dart \
  packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart
Analyzing assets.dart, bundle_builder.dart, assets_test.dart... 0.5s
No issues found!

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Looks good to me! Just need signoff from @chingjun before we can submit this.

chingjun
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LGTM, thanks for adding the support for flavors and platforms!

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Support transformers for flutter.shaders entries in pubspec.yaml

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