Flutter Fix

Contents

The Flutter Fix feature, introduced in Flutter 2, combines a Dart command-line tool with changes suggested by the Dart analyzer to automatically clean up deprecated APIs in your codebase.

This feature has also been added to IDE plugins for Flutter (2.0) and Dart (2.12). Depending on the IDE, these automated updates are called quick-fixes (IntelliJ, Android Studio, Eclipse) or code actions (VS Code).

Applying individual fixes

You can use any supported IDE to apply a single fix at a time.

IntelliJ and Android Studio

When the analyzer detects a deprecated API, a light bulb appears on that line of code. Clicking the light bulb displays the suggested fix that updates that code to the new API. Clicking the suggested fix performs the update.

Screenshot showing suggested change in IntelliJ
A sample quick-fix in IntelliJ

VS Code

When the analyzer detects a deprecated API, it presents an error. You can do any of the following:

  • Hover over the error and then click the Quick Fix link. This presents a filtered list showing only fixes.
  • Put the caret in the code with the error and click the light bulb icon that appears. This shows a list of all actions, including refactors.
  • Put the caret in the code with the error and press the shortcut (Command+. on Mac, Control+. elsewhere) This shows a list of all actions, including refactors.

Screenshot showing suggested change in VS Code
A sample code action in VS Code

Applying project-wide fixes

To see or apply changes to an entire project, you can use the command-line tool, dart fix.

This tool has two options:

  • To see a full list of available changes, run the following command:

    dart fix --dry-run

  • To apply all changes in bulk, run the following command:

    dart fix --apply

For more information on Flutter deprecations, see Deprecation lifetime in Flutter, a free article on Flutter’s Medium publication.