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[js_interop_gen] Decompose Transformer._transformType and deduplicate type caching - #579
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This pull request refactors the Transformer class in transformer.dart by extracting complex type transformation logic from the main switch statement into dedicated helper methods, such as _transformConditionalType, _transformTypeLiteral, _transformClosureType, _transformUnionType, _transformIntersectionType, and _transformIndexedAccessType. It also introduces utility methods like _filterNonNullableTypeNodes and _getOrCreateCachedType to reduce code duplication and improve maintainability. I have no feedback to provide as there are no review comments and the changes are clean and well-structured.
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…te type caching Stacked on #578. - Extract `_transformConditionalType`, `_transformTypeLiteral`, `_transformClosureType`, `_transformUnionType`, `_transformIntersectionType`, and `_transformIndexedAccessType` from `Transformer._transformType` in `lib/src/interop_gen/transform/transformer.dart`, reducing `Transformer._transformType` cognitive complexity from `190` to `59` (-68.9%). - Extract `_filterNonNullableTypeNodes` and `_getOrCreateCachedType` helpers on `Transformer`, eliminating duplicate union/intersection filtering and `typeMap` caching blocks (`pkg:dedupe` `cluster-45`, `cluster-51`, and `cluster-52`).
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Revisions updated by `dart tools/rev_sdk_deps.dart`. core (https://github.com/dart-lang/core/compare/08e4022..4d80610): 4d80610a Thu Oct 1 22:03:38 2026 +0000 dependabot[bot] Bump the github-actions group with 5 updates (dart-lang/core#1005) dartdoc (https://github.com/dart-lang/dartdoc/compare/2a040a8..5eb0f2c): 5eb0f2c7 Thu Oct 1 19:03:48 2026 +0000 dependabot[bot] Bump github/codeql-action/upload-sarif from 4.37.9 to 4.38.2 in the github-actions group (dart-lang/dartdoc#4291) http (https://github.com/dart-lang/http/compare/d8e8e9c..585d433): 585d433 Mon Oct 5 16:12:54 2026 -0700 Brian Quinlan fix(cupertino_http): fix a websocket memory leak (dart-lang/http#1991) 337adf3 Mon Oct 5 16:03:25 2026 -0700 Brian Quinlan fix(cupertino_http): add `autoReleasePool` use to `CupertinoClient` (dart-lang/http#1990) 47c57df Tue Sep 29 14:07:01 2026 -0700 Brian Quinlan fix(ok_http): fix `NetworkOnMainThreadException` (dart-lang/http#1995) d8cde5d Tue Sep 29 14:06:44 2026 -0700 Brian Quinlan fix test (dart-lang/http#1996) 31056fe Tue Sep 29 13:57:20 2026 -0700 Brian Quinlan chore(cronet_http): prepare to release 1.10.0 (dart-lang/http#1993) 9bc3a91 Tue Sep 29 13:53:25 2026 -0700 Brian Quinlan fix(cronet_http): one global reference per `onReadCompleted` (dart-lang/http#1992) 49ecd36 Mon Sep 28 14:20:26 2026 -0700 Brian Quinlan fix(conformance): `supportsAbort` not considered in response (dart-lang/http#1994) native (https://github.com/dart-lang/native/compare/27f7678..a2a6179): a2a617910 Tue Oct 6 13:53:17 2026 +0200 Daco Harkes [jni_flutter] Bump version for publishing (dart-lang/native#3730) d3a99d66b Tue Oct 6 19:46:34 2026 +1100 Liam Appelbe [infra] Fix ffigen and jni_flutter (dart-lang/native#3724) b66d0815a Tue Oct 6 04:28:35 2026 +0300 Manar Elhabbal [ffigen] add Support passing C++ classes by value (dart-lang/native#3677) f7ffe9667 Fri Oct 2 11:33:49 2026 +0200 Moritz [native_toolchain_c] Don't pass /INCLUDE per symbol with a generated .def on Windows (dart-lang/native#3718) 77a5e4169 Thu Oct 1 10:56:45 2026 +0300 Hassnaa Mohamed [ffigen] Fix cpp method filtering (dart-lang/native#3696) cca065ca6 Thu Oct 1 10:17:12 2026 +1000 Liam Appelbe [infra] Prepare to publish everything (dart-lang/native#3716) f13623ee3 Thu Oct 1 10:16:39 2026 +1000 Liam Appelbe [jnigen] API docs (dart-lang/native#3715) be618790c Thu Oct 1 10:05:26 2026 +1000 Liam Appelbe [objective_c] API docs (dart-lang/native#3708) a18dd1148 Thu Oct 1 10:04:38 2026 +1000 Liam Appelbe [ffigen] API docs (dart-lang/native#3707) 6fd87c3b2 Tue Sep 29 19:01:11 2026 -0700 Brian Quinlan [jni] Clarify `JBuffer.asUint8List` behavior (dart-lang/native#3704) 6d5bbcfad Wed Sep 30 09:35:47 2026 +1000 Liam Appelbe [jni] API documentation (dart-lang/native#3706) fbcbc894b Wed Sep 30 09:35:34 2026 +1000 Liam Appelbe [ffigen] Document autorelease issues (dart-lang/native#3705) f99449ec9 Tue Sep 29 09:39:27 2026 +1000 Liam Appelbe [infra] Add swift2objc to the workspace (dart-lang/native#3700) 31494fa08 Tue Sep 29 09:38:59 2026 +1000 Liam Appelbe [infra] Add jni_util to the workspace (dart-lang/native#3698) shelf (https://github.com/dart-lang/shelf/compare/e5c8dc6..b2cb503): b2cb503 Wed Sep 30 22:53:07 2026 -0700 Kevin Moore Resolve shelf.io.connection_info lazily (dart-lang/shelf#542) b70fafa Tue Sep 29 13:37:08 2026 -0700 Kevin Moore Match parameterless shelf_router routes without running a regex (dart-lang/shelf#544) test (https://github.com/dart-lang/test/compare/4f92d53..d749b10): d749b104 Mon Oct 5 15:42:46 2026 -0700 Nate Bosch Fail isolate suites when the test isolate exits (dart-lang/test#2775) da2157e9 Mon Oct 5 11:12:43 2026 -0700 Nate Bosch Wait longer for the Chrome test tab to appear (dart-lang/test#2771) 00bd0c99 Mon Oct 5 18:50:03 2026 +0300 Yusuf İhsan Görgel Fix broken links in architecture.md (dart-lang/test#2774) 3be2f547 Thu Oct 1 03:46:29 2026 +0000 dependabot[bot] Bump the github-actions group with 4 updates (dart-lang/test#2773) 40a5ad90 Tue Sep 29 12:07:31 2026 -0700 Nate Bosch Delete compilation artifacts once they are no longer needed (dart-lang/test#2764) 171ad0e5 Mon Sep 28 17:29:48 2026 -0700 Jacob MacDonald export additional types from package:test_api/backend.dart (dart-lang/test#2745) 52b45064 Mon Sep 28 15:04:08 2026 -0700 Nate Bosch Tag browser and node tests, relax flaky timeouts (dart-lang/test#2770) tools (https://github.com/dart-lang/tools/compare/d87eaf7..a66d517): a66d517d Tue Oct 6 09:41:32 2026 -0700 Phil Quitslund [analytics] `DASH__SUPPRESS_ANALYTICS` env handling (dart-lang/tools#2641) 00c6e4ad Fri Oct 2 17:17:49 2026 +0530 shivytyahoo Fix VersionConstraint.intersection throwing on disjoint ranges (dart-lang/tools#2622) d523e1f8 Thu Oct 1 11:09:16 2026 +0200 Morgan :) [unified_analytics] Append to the log file instead of rewriting it (dart-lang/tools#2613) 6993cbad Wed Sep 30 14:09:32 2026 +0300 Yusuf İhsan Görgel [yaml] Improve error messages when mixing list and key-value syntax (dart-lang/tools#2610) 068119b4 Tue Sep 29 23:21:03 2026 +0200 Lukas Klingsbo [pubspec_parse] Support tag_pattern for git dependencies (dart-lang/tools#2565) 7d859ed5 Mon Sep 28 20:28:23 2026 -0700 Kevin Moore [api_summary] Add expectApiSummaryClean and --write/--check CLI flags (dart-lang/tools#2603) web (https://github.com/dart-lang/web/compare/ec71a4c..63e6662): 63e6662 Sat Oct 3 00:23:21 2026 +0000 Natalie Weizenbaum Add a JSPair type (dart-lang/web#586) 2d68d90 Fri Oct 2 20:26:48 2026 +0000 Natalie Weizenbaum Use `js_interop` APIs in `js_interop_gen` (dart-lang/web#585) 037823c Thu Oct 1 21:59:21 2026 +0000 Natalie Weizenbaum Add JSMap, JSSet, and JSSetLike types (dart-lang/web#571) b2d1d6b Thu Oct 1 06:57:03 2026 +0000 dependabot[bot] Bump the github-actions group with 3 updates (dart-lang/web#584) 8dc8f75 Wed Sep 30 08:12:18 2026 -0700 Kevin Moore [js_interop_gen] Split union/intersection AST types and extract TypeTransformer (dart-lang/web#580) 751ccdf Wed Sep 30 08:12:18 2026 -0700 Kevin Moore [js_interop_gen] Decompose `Transformer._transformType` and deduplicate type caching (dart-lang/web#579) 6f3dd4e Wed Sep 30 08:12:17 2026 -0700 Kevin Moore [js_interop_gen] Deduplicate `UnionType` and `IntersectionType` via `UnionOrIntersectionType` (dart-lang/web#578) d9f095e Tue Sep 29 12:17:29 2026 -0700 Kevin Moore [js_interop_gen] Remove unused JS interop extension types and bindings (dart-lang/web#577) 07111ee Tue Sep 29 09:51:36 2026 -0700 Kevin Moore fix(js_interop_gen): update js_type_supertypes for Dart 3.12 (dart-lang/web#582) Change-Id: I4532049c45561fe8f8c57713ac8ec2153096fd9a Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/560660 Commit-Queue: Nate Bosch <[email protected]> Reviewed-by: Brian Quinlan <[email protected]>
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Decomposes
Transformer._transformType(lib/src/interop_gen/transform/transformer.dart) and consolidates repeated AST caching and non-nullable filtering loops:_transformConditionalType(score10)_transformTypeLiteral(score5)_transformClosureType(score4)_transformUnionType(score5)_transformIntersectionType(score5)_transformIndexedAccessType(score12)_filterNonNullableTypeNodes(eliminating identicalisNotNullLike+null/undefinedfiltration loops across conditional and union types) and_getOrCreateCachedType<T>(eliminating repeatedtypeMaplookup/create/cache boilerplate).🤖 Tool Provenance & Complexity Delta
This refactoring was guided by
cognitive_complexity(v0.2.4) anddedupe(v0.1.0, clusters45,51,52).Transformer._transformType(lib/src/interop_gen/transform/transformer.dart)19059(-68.9%)<=15per extracted branch helperTo reproduce or re-evaluate cognitive complexity and structural duplication locally: