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Set --no-js-strongly-connected-components for DDC compiles by default - #193485
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This pull request adds the --no-js-strongly-connected-components flag to the DDC compiler options when web hot reload is enabled. However, an unresolved merge conflict and a syntax error were introduced in the compile_test.dart file, which need to be resolved.
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Can you add some details about what this does instead of SCCs? How does the FES choose to break up the modules in this mode? Do we end up with one giant module or more smaller modules?
mdebbar
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Updated the PR comments with more info - thanks! |
mdebbar
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nshahan
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flutter/flutter@55b8f88...d649d2b 2026-09-30 [email protected] [Android] Update the CLI to reject passing engine configuration flags with a prebuilt binary in release mode (flutter/flutter#190870) 2026-09-30 [email protected] Roll Skia from af1e8b356dd1 to c7b323126bf0 (1 revision) (flutter/flutter#193569) 2026-09-30 [email protected] [web] Respect text affinity in getLineBoundary at a soft wrap (flutter/flutter#192664) 2026-09-30 [email protected] [tool] Migrate TestCommand and platform runner to modular dependency injection (flutter/flutter#190789) 2026-09-30 [email protected] Roll Skia from 3a20a0464d25 to af1e8b356dd1 (1 revision) (flutter/flutter#193564) 2026-09-30 [email protected] Roll Skia from 554ef62d11a9 to 3a20a0464d25 (6 revisions) (flutter/flutter#193556) 2026-09-30 [email protected] Use null aware elements in `platform_views.dart` (flutter/flutter#193214) 2026-09-30 [email protected] Replace deprecated `withOpacity` in `flutter_logo.dart` (flutter/flutter#192583) 2026-09-30 [email protected] Roll Skia from f441ca223b2b to 554ef62d11a9 (72 revisions) (flutter/flutter#193548) 2026-09-30 [email protected] Fix StrcmpFixed matching prefixes in the Vulkan embedder tests (flutter/flutter#192999) 2026-09-30 [email protected] Update Engine to test Android 17 AVD (flutter/flutter#193239) 2026-09-29 [email protected] Give the Vulkan test context the extensions Impeller requires (flutter/flutter#193002) 2026-09-29 [email protected] Rename "subtext" to "supportingTextPadding" in `FormField`'s documentation (flutter/flutter#183582) 2026-09-29 [email protected] Set --no-js-strongly-connected-components for DDC compiles by default (flutter/flutter#193485) 2026-09-29 [email protected] Split pre-AGP 8.3 module AAR test into a Java 17 pinned target (flutter/flutter#193467) 2026-09-29 [email protected] Remove no-shuffle from gen_defaults_test (flutter/flutter#192280) 2026-09-29 [email protected] Update guidance on bumping Dart (flutter/flutter#193131) 2026-09-29 [email protected] Remove vestigial `download_jdk` gclient var (flutter/flutter#188571) 2026-09-29 [email protected] Roll pub packages (flutter/flutter#193522) 2026-09-29 [email protected] [flutter_tools] Lazily initialize AndroidSdk platform and build-tools discovery (flutter/flutter#191972) 2026-09-29 [email protected] [tool] Migrate Web build subcommands and toolchain to modular dependency injection (flutter/flutter#190783) 2026-09-29 [email protected] Pin androidx.test dependencies in integration_test (flutter/flutter#193316) 2026-09-29 [email protected] [flutter_tools] Include flutter.js.map in web builds (flutter/flutter#192257) 2026-09-29 [email protected] [WebParagraph] Fixing edge cases for wrapping text (with newlines) (flutter/flutter#189858) 2026-09-29 [email protected] Bump customer testing version for flutter/devtools update (flutter/flutter#193511) 2026-09-29 [email protected] Roll Packages from ba0364a to 3c6ce59 (14 revisions) (flutter/flutter#193507) 2026-09-29 [email protected] [flutter_tools] Guard socket streams and done futures against socket reset errors (flutter/flutter#192941) If this roll has caused a breakage, revert this CL and set the roller to dry run mode using the controls here: https://autoroll.skia.org/r/flutter-packages Please CC [email protected],[email protected] on the revert to ensure that a human is aware of the problem. To file a bug in Packages: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://issues.skia.org/issues/new?component=1389291&template=1850622 Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
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Context: DDC's old module system was sensitive to load order, so mutual/cyclic imports needed to be combined into a single 'module' (using a strongly-connected-components/SCC algorithm in our various build infrastructure).
DDC's new Library Bundle module system doesn't have this restriction, so we can safely disable SCCs. The net result is that every library emits one JS artifact, which helps us avoid problems with overly large connected components causing parse deoptimizations in Chrome/V8. More artifacts are emitted (so perhaps higher compile time), but the overall load time is improved - especially for larger apps.
Resolves some of the performance degradations reported in: #192687