Who contributed to Mobile platforms on June 17, 2026?

5 developers shipped this update, including a-viv-a, hamishknight, mikeash, broadwaylamb, and fzhinkin.

What were the notable Mobile platforms updates?

Prevent downgrading `project.pbxproj` when greater version number (#186250), Roll Skia from d7196b0b4939 to 2ffd155313f5 (9 revisions) (#188081), and [flutter_tools] Format empty app template with latest dart format (#187443).

Mobile platforms

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The Wire · Showcase

FLUTTER LOCKS DOWN XCODE VERSIONS, SWIFT TIGHTENS SENDABLE RULES

By RepoJournal · Filed 06:05 UTC on June 17, 2026 · About Mobile platforms

5 people shipped this

a-viv-a @a-viv-a 1 cited

hamishknight @hamishknight 1 cited

mikeash @mikeash 1 cited

broadwaylamb @broadwaylamb 1 cited

fzhinkin @fzhinkin 1 cited

Flutter blocked a dangerous downgrade path in Xcode project files while Swift toolchain hardens concurrency guarantees across three separate commits.

Flutter shipped a critical fix that prevents the build system from downgrading `project.pbxproj` version numbers when a higher version already exists [1], closing a long-standing issue where migrations could corrupt Xcode project state. In parallel, the Skia graphics engine rolled forward nine revisions [2] with improvements to CanvasKit path handling and PNG gainmap support, while Flutter's empty app template got reformatted to match current Dart style conventions [3]. Over on the Swift side, the compiler tightened sendability checking for isolated classes to reject the illegal `@MainActor` plus Sendable plus non-Sendable superclass combination [4], a pattern that exists in production but will become an error in a future minor version. Swift also fixed invalid extension handling to prevent them from leaking into generated Clang headers [5] and made runtime lookups gracefully fail when encountering type mismatches in mangled names [6]. Kotlin's JavaScript export now respects file-level annotations in the Analysis API [7], while the test framework gained lazy message-producing lambda overloads for assertions [8].

Action items

→ Review Xcode project file migrations in your build pipeline - the version downgrade fix prevents silent corruption flutter/flutter [plan]
→ Check for @MainActor isolated classes with non-Sendable superclasses - they will error in Swift's next minor version apple/swift [monitor]
→ Update Kotlin test assertions to use lazy message lambdas for expensive error message construction JetBrains/kotlin [plan]

References

[1] Prevent downgrading `project.pbxproj` when greater version number (#186250) flutter/flutter
[2] Roll Skia from d7196b0b4939 to 2ffd155313f5 (9 revisions) (#188081) flutter/flutter
[3] [flutter_tools] Format empty app template with latest dart format (#187443) flutter/flutter
[4] [Sema] Reject Sendable on isolated class with non-Sendable superclass ↗ apple/swift
[5] [Sema] A few invalid `extension` fixes ↗ apple/swift
[6] [Runtime] Gracefully fail when looking up a mangled name with an integer where a type is required. ↗ apple/swift
[7] [JS] Respect file-level annotations in Analysis API-based TypeScript export ↗ JetBrains/kotlin
[8] KT-31305: Introduce kotlin.test assertions overloads accepting a message-producing lambda ↗ JetBrains/kotlin

Quick answers

What shipped in Mobile platforms on June 17, 2026?: Flutter blocked a dangerous downgrade path in Xcode project files while Swift toolchain hardens concurrency guarantees across three separate commits. In total, 86 commits and 55 pull requests landed.
Who contributed to Mobile platforms on June 17, 2026?: 5 developers shipped this update, including a-viv-a, hamishknight, mikeash, broadwaylamb, and fzhinkin.
What were the notable Mobile platforms updates?: Prevent downgrading `project.pbxproj` when greater version number (#186250), Roll Skia from d7196b0b4939 to 2ffd155313f5 (9 revisions) (#188081), and [flutter_tools] Format empty app template with latest dart format (#187443).

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mobile 29 shipped 1-min read

Mobile platforms 2 days ago

SWIFT MACRO IMPORTS AND KOTLIN CLASS INITIALIZATION FIXES SHIP ACROSS PLATFORMS

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mobile 22 shipped 1-min read

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mobile 147 shipped 2-min read

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