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avoid-banned-imports

added in: 1.6.0
warning
⚙️🛠
Pro+

Warns against using banned imports.

note

This rule requires configuration in order to highlight any issues.

⚙️ Config​

Set entries (default is empty) to configure the list of entries for imports to ban.

Each entry is an object with 4 fields (paths, deny, message and severity):

  • Set paths (can be a regular expression) to configure the list of paths the entry will apply to.
  • Set deny (can be a regular expression) to configure the list of imports to ban.
  • Set message to configure a user-facing message for each issue created from this config entry.
  • Set severity (optional) to override default severity for the given entry.
analysis_options.yaml
dart_code_metrics:
  rules:
    - avoid-banned-imports:
        entries:
        - paths: ['some/folder/.*\.dart', 'another/folder/.*\.dart']
          deny: ['package:flutter/material.dart']
          message: 'Do not import Flutter Material Design library, we should not depend on it!'
          severity: error
        - paths: ['core/.*\.dart']
          deny: ['package:flutter_bloc/flutter_bloc.dart']
          message: 'State management should be not used inside "core" folder.'
warning

For Windows devices, ensure that the paths config works with Windows path separators.

Example​

❌ Bad:

// LINT: This import is not allowed (Do not import Flutter Material Design library, we should not depend on it!).
import "package:flutter/material.dart";

// LINT: This import is not allowed (State management should be not used inside "core" folder.).
import "package:flutter_bloc/flutter_bloc.dart";

✅ Good:

// Correct, no banned imports in the listed folders