falconGitHub

library-prefixes

Same as library_prefixes in Dart lints

Group
Style
Path
lint/style/library-prefixes
Default
On (recommended)
Origin
Dart lints
Rule
253 of 512
recommended

Flags import prefixes that are not lower_case_with_underscores.

An import prefix (import '...' as foo;) is a library-style name and should use lower_case_with_underscores to match Dart's package and library naming. Prefixes may have one leading $ and leading underscores, then must start with a lowercase letter and contain only lowercase letters, digits, and underscores.

Invalid

example.dartdart
// Import prefixes must be lower_case_with_underscores.

import 'dart:math' as Math;
import 'dart:async' as MyAsync;
import 'dart:convert' as JSON;
import 'dart:io' as IO;
import 'dart:collection' as CollectionLib;
import 'dart:typed_data' as TypedData;
Use `lowercase_with_underscores` for a library prefix.
2
3import 'dart:math' as Math;
Use `lowercase_with_underscores` for a library prefix.
3import 'dart:math' as Math;
4import 'dart:async' as MyAsync;
Use `lowercase_with_underscores` for a library prefix.
4import 'dart:async' as MyAsync;
5import 'dart:convert' as JSON;
Use `lowercase_with_underscores` for a library prefix.
5import 'dart:convert' as JSON;
6import 'dart:io' as IO;
Use `lowercase_with_underscores` for a library prefix.
6import 'dart:io' as IO;
7import 'dart:collection' as CollectionLib;
Use `lowercase_with_underscores` for a library prefix.
7import 'dart:collection' as CollectionLib;
8import 'dart:typed_data' as TypedData;

Valid

example.dartdart
// lower_case_with_underscores import prefixes.

import 'dart:math' as math;
import 'dart:async' as async_lib;
import 'dart:convert' as convert;
import 'dart:io' as io;
import 'dart:collection' as collection;
import 'dart:typed_data' as typed_data;

Configure library-prefixes

Set its severity in falcon.json. See the configuration guide.

falcon.jsonjson
{
  "linter": {
    "rules": {
      "style": {
        "library-prefixes": "error"
      }
    }
  }
}

Or silence one occurrence with a suppression comment; the reason is required.

example.dartdart
// falcon-ignore lint/style/library-prefixes: <reason>