directives_ordering

Adhere to Effective Dart Guide directives sorting conventions.

This rule is available as of Dart 2.0.0.

This rule has a quick fix available.

Details

DO follow the directive ordering conventions in Effective Dart:

DO place dart: imports before other imports.

BAD:

import 'package:bar/bar.dart';
import 'package:foo/foo.dart';

import 'dart:async';  // LINT
import 'dart:html';  // LINT

BAD:

import 'dart:html';  // OK
import 'package:bar/bar.dart';

import 'dart:async';  // LINT
import 'package:foo/foo.dart';

GOOD:

import 'dart:async';  // OK
import 'dart:html';  // OK

import 'package:bar/bar.dart';
import 'package:foo/foo.dart';

DO place package: imports before relative imports.

BAD:

import 'a.dart';
import 'b.dart';

import 'package:bar/bar.dart';  // LINT
import 'package:foo/foo.dart';  // LINT

BAD:

import 'package:bar/bar.dart';  // OK
import 'a.dart';

import 'package:foo/foo.dart';  // LINT
import 'b.dart';

GOOD:

import 'package:bar/bar.dart';  // OK
import 'package:foo/foo.dart';  // OK

import 'a.dart';
import 'b.dart';

DO specify exports in a separate section after all imports.

BAD:

import 'src/error.dart';
export 'src/error.dart'; // LINT
import 'src/string_source.dart';

GOOD:

import 'src/error.dart';
import 'src/string_source.dart';

export 'src/error.dart'; // OK

DO sort sections alphabetically.

BAD:

import 'package:foo/bar.dart'; // OK
import 'package:bar/bar.dart'; // LINT

import 'a/b.dart'; // OK
import 'a.dart'; // LINT

GOOD:

import 'package:bar/bar.dart'; // OK
import 'package:foo/bar.dart'; // OK

import 'a.dart'; // OK
import 'a/b.dart'; // OK

To enable the directives_ordering rule, add directives_ordering under linter > rules in your analysis_options.yaml file:

linter:
  rules:
    - directives_ordering