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wire 2026-09-02
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$ the-wire · showcase

Flutter tool DI migration lands Doctor and Channel commands

By RepoJournal · Filed · About Mobile platforms

Ben Konyi Soroush Yousefpour Anas Saifi Hamed DougGregor slavapestov rickclephas
14 people shipped this
Ben Konyi @bkonyi 2 cited Soroush Yousefpour @gabrimatic 1 cited Anas Saifi @anazr9 1 cited Hamed @papmodern 1 cited DougGregor @DougGregor 1 cited slavapestov @slavapestov 1 cited rickclephas @rickclephas 1 cited xedin @xedin Snowy1803 @Snowy1803 compnerd @compnerd broadwaylamb @broadwaylamb Ilya Chernikov @ligee dimonchik0036 @dimonchik0036 BlaBlaHuman @BlaBlaHuman

The Flutter tool's modular dependency injection migration reaches the Doctor and Channel commands, removing ambient access from FlutterCommand.

Flutter tooling continues its modular dependency injection migration: `ChannelCommand` and `DoctorCommand` now use explicit constructor injection via `ToolContext`, removing ambient access from `FlutterCommand` and gaining hermetic unit tests [1][2]. Those are breaking changes for internal tool code, not for app developers. Separately, RawScrollbar gains a `mouseCursor` property that resolves states like `WidgetState.hovered`, `WidgetState.dragged`, and `WidgetState.disabled` [3]. FadeInImage adds `FadeInImageTransition.sequential` (default) and `FadeInImageTransition.fadeInOver`; the latter fades the image in on top of the placeholder, which stays at full opacity until the image finishes loading [4]. An Android crash is fixed: when an Activity is destroyed while a texture producer has a frame in flight, the `onImage` callback can run after FlutterJNI detaches, and the guard prevents `scheduleEngineFrame` from raising `RuntimeException: Cannot execute operation because FlutterJNI is not attached to native.` [5]. In Swift, a borrow accessor call on a guaranteed 'self' now forms a lifetime dependency on the borrowed root, handling structs containing class instances with 'let' values [6]. Subtyping checks gain handling for sync vs async differences and function types [7]. Kotlin's Swift Export fixes sealedType functions by using type checks as fallback, addressing KT-88999 [8].

Action items

References

  1. [1] [tool] Migrate ChannelCommand to modular dependency injection (#190751) ↗ flutter/flutter
  2. [2] [tool] Migrate DoctorCommand to modular dependency injection (#190758) ↗ flutter/flutter
  3. [3] Add mouseCursor to RawScrollbar (#185750) ↗ flutter/flutter
  4. [4] Add FadeInImageTransition.fadeInOver to fade the image in over the placeholder (#186246) ↗ flutter/flutter
  5. [5] [Android] Do not schedule engine frames on a detached FlutterJNI (#191204) ↗ flutter/flutter
  6. [6] [Lifetimes] Form a lifetime dependency on the guaranteed base of a borrow accessor call ↗ apple/swift
  7. [7] Sema: Minor improvements to subtyping checks ↗ apple/swift
  8. [8] [Swift Export] Use type checks as fallback for sealedType functions ↗ JetBrains/kotlin

$ ls mobile/reviews/ # the step-back reads

the week in review Flutter tool moves to constructor injection the month in review Swift and Flutter steady runtimes; Kotlin locks down builds
Topics: Mobile Full archive →

Quick answers

What shipped in Mobile platforms on September 2, 2026?
The Flutter tool's modular dependency injection migration reaches the Doctor and Channel commands, removing ambient access from FlutterCommand. In total, 124 commits, 75 pull requests, and 1 releases landed.
Who contributed to Mobile platforms on September 2, 2026?
14 developers shipped this update, including Ben Konyi, Soroush Yousefpour, Anas Saifi, Hamed, DougGregor, slavapestov, xedin, and Snowy1803, and 6 more.
What were the notable Mobile platforms updates?
[tool] Migrate ChannelCommand to modular dependency injection (#190751), [tool] Migrate DoctorCommand to modular dependency injection (#190758), and Add mouseCursor to RawScrollbar (#185750).
♥

$ log Mobile platforms --recent

Flutter engine rolls Skia and Fuchsia SDK 8 shipped Swift and Kotlin compiler fixes land, Flutter dependency rolls continue 30 shipped Swift's async runtime paves way for per-function CPU control and macro-driven conformance 156 shipped Flutter fixes semantics geometry, UTF-16 deletion, iOS keyboard accents 160 shipped

$ log --all # elsewhere on the wire

Meta React Native adds Stable API guards to renderer attributed string FastAPI & Pydantic Pydantic fixes Mypy plugin crash, tightens datetime constraints

$ ls showcases/

Rails Django Laravel Node.js Go Vercel Vue.js Kubernetes HashiCorp Arch Linux Linux Anthropic

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