TIL: Since some time ago, you have to ask the linter to give deprecated warnings from the same package

filip · September 7, 2026, 10:35am

Until today, I thought I’m hitting some intermittent bug! I made a member deprecated, and the linter wouldn’t show me warnings even when I knew for a fact that the member is used all over the place.

Today, I finally filed the bug:

github.com/dart-lang/sdk

Use of deprecated member lint warning no longer firing for me

opened 10:27AM - 07 Sep 26 UTC

filiph

area-devexp

Since a few months ago at least, I noticed that I don't get lint warning when so…me code uses a deprecated member of a class. Code like this: ```dart import 'dart:io'; void main() { final foo = Foo(); stdout.writeln(foo.bar); } class Foo { @Deprecated('do not use this') int bar; Foo() : bar = 0; } ``` analyzes cleanly: ``` % dart analyze lib/ Analyzing lib... 3.8s No issues found! ``` Here's the analysis_options.yaml file in this project: ```yaml include: package:flutter_lints/flutter.yaml analyzer: language: strict-casts: true strict-inference: true strict-raw-types: true exclude: - lib/steamworks/generated/** - build/** - android/** - ios/** - web/** - windows/** - macos/** - linux/** linter: # https://dart-lang.github.io/linter/lints/index.html. rules: always_use_package_imports: true directives_ordering: true unawaited_futures: true # Temporarily comment out the following lines when you want `dart fix` # to help you convert everything that can be `const`, to `const`. # I keep these off so that the ceaseless adding and removing of `const` # up and down widget trees doesn't make the development unnecessarily # slow and annoying. prefer_const_constructors: false prefer_const_literals_to_create_immutables: false # Additional information about this file can be found at # https://dart.dev/guides/language/analysis-options ``` I'm adding analysis server diagnostic report. [dart_analyzer_diagnostics_report.json](https://github.com/user-attachments/files/31909118/dart_analyzer_diagnostics_report.json) Version: ``` % dart --version Dart SDK version: 3.13.2 (stable) (Tue Aug 25 01:01:12 2026 -0700) on "macos_arm64" ```

But then immediately realized it’s just a linter setting now!

linter:
  rules:
    deprecated_member_use_from_same_package: true