[api_summary] Include mixins in textual API summaries

[kevmoo]

Fixes an issue where with mixin clauses were omitted when generating textual API summaries for class and interface declarations.

Ports over dart-lang/sdk@1e8a9d5

[gemini-code-assist]

Code Review

This pull request adds support for describing mixins in the API summary generator. It extracts the mixins field from InterfaceElement and appends them to the instance description with a 'with' prefix. Additionally, a new test case test_class_mixins has been added to verify this functionality. There are no review comments, and the changes look clean and well-tested.

[github-actions]

Package publishing

Package	Version	Status	Publish tag (post-merge)
package:api_summary	0.1.0-wip	WIP (no publish necessary)
package:bazel_worker	1.1.5	already published at pub.dev
package:benchmark_harness	2.4.0	already published at pub.dev
package:boolean_selector	2.1.2	already published at pub.dev
package:browser_launcher	1.2.0-wip	WIP (no publish necessary)
package:cli_config	0.2.1-wip	WIP (no publish necessary)
package:cli_util	0.5.1	already published at pub.dev
package:clock	1.1.3-wip	WIP (no publish necessary)
package:code_builder	4.12.0-wip	WIP (no publish necessary)
package:coverage	1.15.0	already published at pub.dev
package:csslib	1.0.2	already published at pub.dev
package:extension_discovery	2.1.0	already published at pub.dev
package:file	7.0.2-wip	WIP (no publish necessary)
package:file_testing	3.1.0-wip	WIP (no publish necessary)
package:glob	2.1.3	already published at pub.dev
package:graphs	2.4.0-wip	WIP (no publish necessary)
package:html	0.15.7-wip	WIP (no publish necessary)
package:io	1.1.0-wip	WIP (no publish necessary)
package:json_rpc_2	4.1.0	already published at pub.dev
package:markdown	7.4.0	ready to publish	markdown-v7.4.0
package:mime	2.1.0-wip	WIP (no publish necessary)
package:oauth2	2.0.5	already published at pub.dev
package:package_config	2.3.0-wip	WIP (no publish necessary)
package:pool	1.5.3-wip	WIP (no publish necessary)
package:process	5.0.5	(error) pubspec version (5.0.5) and changelog (5.0.6-wip) don't agree
package:pub_semver	2.2.0	already published at pub.dev
package:pubspec_parse	1.6.0-wip	WIP (no publish necessary)
package:source_map_stack_trace	2.1.3-wip	WIP (no publish necessary)
package:source_maps	0.10.14-wip	WIP (no publish necessary)
package:source_span	1.10.2	already published at pub.dev
package:sse	4.2.0	already published at pub.dev
package:stack_trace	1.12.2-wip	(error) pubspec version (1.12.2-wip) and changelog (1.12.2-dev) don't agree
package:stream_channel	2.1.4	already published at pub.dev
package:stream_transform	2.1.2-wip	WIP (no publish necessary)
package:string_scanner	1.4.2-wip	WIP (no publish necessary)
package:term_glyph	1.2.3-wip	WIP (no publish necessary)
package:test_reflective_loader	0.6.0	ready to publish	test_reflective_loader-v0.6.0
package:timing	1.0.2	already published at pub.dev
package:unified_analytics	8.0.15	ready to publish	unified_analytics-v8.0.15
package:watcher	1.2.2-wip	WIP (no publish necessary)
package:yaml	3.1.4-wip	WIP (no publish necessary)
package:yaml_edit	2.2.4	already published at pub.dev

Documentation at https://github.com/dart-lang/ecosystem/wiki/Publishing-automation.

[github-actions]

PR Health

API leaks ✔️

The following packages contain symbols visible in the public API, but not exported by the library. Export these symbols or remove them from your publicly visible API.

Package	Leaked API symbol	Leaking sources

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Unused Dependencies ✔️

Package	Status
api_summary	✔️ All dependencies utilized correctly.

For details on how to fix these, see dependency_validator.

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License Headers ✔️

// Copyright (c) 2026, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

Files
no missing headers

All source files should start with a license header.

Unrelated files missing license headers

Files
pkgs/bazel_worker/benchmark/benchmark.dart
pkgs/coverage/lib/src/coverage_options.dart
pkgs/html/example/main.dart
pkgs/pubspec_parse/test/git_uri_test.dart
pkgs/watcher/test/custom_watcher_factory_test.dart

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Breaking changes ⚠️

Package	Change	Current Version	New Version	Needed Version	Looking good?
api_summary	Breaking	0.0.0	0.0.0	0.0.0 Report was not created for package:api_summary 0.1.0-wip (dir=/home/runner/work/tools/tools/current_repo/pkgs/api_summary). Error: Error: Exception: Package not available (could not find package api_summary at https://pub.dev).	⚠️

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Coverage ✔️

File	Coverage
pkgs/api_summary/lib/src/api_description.dart	💚 95 % ⬆️ 0 %

This check for test coverage is informational (issues shown here will not fail the PR).

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[natebosch]

Ports over dart-lang/sdk@1e8a9d5

Is there work ongoing to get to a single SoT?

[kevmoo]

Ports over dart-lang/sdk@1e8a9d5

Is there work ongoing to get to a single SoT?

Yep! This is needed so I can delete the internal bits (without regressing!)