Pro+

Check Unused L10n

Checks unused members of classes that provide localization strings.

An example of such class:

class ClassWithLocalization {
  String get title {
    return Intl.message(
      'Hello World',
      name: 'title',
      desc: 'Title for the Demo application',
      locale: localeName,
    );
  }
}

Read more about this localization approach in the Flutter docs.

warning

This command uses --class-pattern option to find classes that are used for accessing localization string. Passing it is mandatory.

To execute the command, run:

$ dcm check-unused-l10n lib # or dcm ul lib

Full command description:

Usage: dcm check-unused-l10n [arguments] <directories>
-h, --help                                       Print this usage information.


-p, --class-pattern (mandatory)                  The pattern to detect classes providing localization.


-r, --reporter=<console>                         Analysis output format.
                                                 [console(Pro+) (default), json(Teams+), codeclimate(Teams+), gitlab(Teams+), checkstyle(Teams+), sonar(Teams+)]
-a, --absolute-path                              Show absolute paths in console reporter output.
    --json-path=<path/to/file.json>              Path to the JSON file with the analysis output.


-c, --print-config                               Print resolved config.


    --root-folder=<./>                           Root folder.
                                                 (defaults to the current directory)
-s, --sdk-path=<directory-path>                  Dart SDK directory path.
                                                 If the project has a `.fvm/flutter_sdk` symlink, it will be used if the SDK is not found.
-e, --exclude=<{**/*.g.dart,**/*.freezed.dart}>  File paths in Glob syntax to be exclude.
                                                 (defaults to "{**/*.g.dart,**/*.freezed.dart}")


    --[no-]congratulate                          Don't show output even when there are no issues.


    --verbose                                    Show verbose logs.


    --ci-key                                     The license key to run on CI server. Can be provided via DCM_CI_KEY env variable.
    --email                                      The email used to purchase the license. Can be provided via DCM_EMAIL env variable.


    --no-analytics                               Disable sending anonymous usage statistics.


    --[no-]fatal-unused                          Treat find unused l10n as fatal.
                                                 (defaults to on)

Output Example

Console (default)

Use --reporter=console to get output in console format.

JSON

Use --reporter=json to get output as a single JSON object containing metadata and the list of localization issues.

Format specification

The root object fields are

• formatVersion - an integer representing the format version (will be incremented each time the serialization format changes)
• timestamp - a creation time of the report in YYYY-MM-DD HH:MM:SS format
• unusedLocalizations - an array of unused files

{
  "formatVersion": 2,
  "timestamp": "2021-04-11 14:44:42",
  "unusedLocalizations": [
    {
      ...
    },
    {
      ...
    },
    {
      ...
    }
  ]
}

The unusedLocalizations object fields are

• path - a relative path of the unused file
• className - a name of the class that has unused members
• issues - an array of issues detected in the target class

{
  "path": "lib/src/some/class.dart",
  "className": "class",
  "issues": [
    ...
  ],
}

The issue object fields are

• memberType - unused class member type
• memberName - unused class member name
• offset - a zero-based offset of the class member location in the source
• line - a zero-based line of the class member location in the source
• column - a zero-based column of class member the location in the source

{ 
  "memberType": "getter",
  "memberName": "someGetter",
  "offset": 156,
  "line": 7,
  "column": 1
}

GitLab

Use --reporter=gitlab to get output in a GitLab-compatible format. To learn how to integrate DCM with GitLab, refer to this guide.

Code Climate

Use --reporter=codeclimate to get output in Code Climate format.

Output example

{"type":"issue","check_name":"unused-localization-issue","description":"Unused getter homeTab","categories":["Bug Risk"],"location":{"path":"lib/src/home_i18n.dart","positions":{"begin":{"column":3,"line":10},"end":{"column":9,"line":14}}},"severity":"major","fingerprint":"1582e402ed53506873775a66a99a0611"}
{"type":"issue","check_name":"unused-localization-issue","description":"Unused getter profileTab","categories":["Bug Risk"],"location":{"path":"lib/src/home_i18n.dart","positions":{"begin":{"column":3,"line":16},"end":{"column":9,"line":20}}},"severity":"major","fingerprint":"fbbf8fd71cb883d03389d4797087bf8e"}

Checkstyle

Use --reporter=checkstyle to get output in Checkstyle format.

Output example

<?xml version="1.0"?>
<checkstyle version="10.0">
  <file name="example.dart">
    <error line="5" column="3" severity="warning" message="Unused method someMethod()" source="unused-localization-issue"/>
  </file>
</checkstyle>

note

Checkstyle format is supported by Bitbucket. To learn how to integrate DCM with Bitbucket, refer to this guide.

Sonar

Use --reporter=sonar to get output in SonarQube's generic format for external issues.

Output example

{
  "rules": [
    {
      "cleanCodeAttribute": "CLEAR",
      "description": "To learn more, visit the documentation https://dcm.dev/docs/cli/code-quality-checks/unused-l10n/",
      "engineId": "dcm",
      "id": "unused-localization-issue",
      "impacts": [
        {
          "severity": "MEDIUM",
          "softwareQuality": "MAINTAINABILITY"
        }
      ],
      "name": "unused-localization-issue"
    }
  ],
  "issues": [
    {
      "primaryLocation": {
        "filePath": "lib/src/home_i18n.dart",
        "message": "Unused getter homeTab",
        "textRange": {
          "endColumn": 9,
          "endLine": 14,
          "startColumn": 3,
          "startLine": 10
        }
      },
      "ruleId": "unused-localization-issue"
    },
    {
      "primaryLocation": {
        "filePath": "lib/src/home_i18n.dart",
        "message": "Unused getter profileTab",
        "textRange": {
          "endColumn": 9,
          "endLine": 20,
          "startColumn": 3,
          "startLine": 16
        }
      },
      "ruleId": "unused-localization-issue"
    }
  ]
}