Description

DO place “dart:” imports before other imports.

Example of incorrect code:

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

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

Example of incorrect code:

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

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

Example of correct code:

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.

Example of incorrect code:

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

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

Example of incorrect code:

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

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

Example of correct code:

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

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

PREFER placing “third-party” “package:” imports before other imports.

Example of incorrect code:

import 'package:myapp/io.dart';
import 'package:myapp/util.dart';

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

Example of correct code:

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

import 'package:myapp/io.dart';
import 'package:myapp/util.dart';

DO specify exports in a separate section after all imports.

Example of incorrect code:

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

Example of correct code:

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

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

DO sort sections alphabetically.

Example of incorrect code:

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

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

Example of correct code:

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

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

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