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constant-identifier-names

Same as constant_identifier_names in Dart lints

Group
Style
Path
lint/style/constant-identifier-names
Default
On (recommended)
Origin
Dart lints
Rule
209 of 512
recommended

Flags constant identifiers that are not lowerCamelCase.

Dart names constants in lowerCamelCase, not the SCREAMING_CAPS common in other languages, so maxCount rather than MAX_COUNT. Following the convention keeps constants visually consistent with every other identifier. The rule covers const declarations at every scope — top-level, static and instance fields, and locals — as well as enum values. The wildcard _ is permitted.

Invalid

example.dartdart
// Constant identifiers must be lowerCamelCase.

const MAX_VALUE = 100;

const PI = 3.14;

const HTTP_PORT = 80;

enum E { FIRST, second }

class C {
  static const DEFAULT_SIZE = 10;
}

void f() {
  const LOCAL_CONST = 1;
  print(LOCAL_CONST);
}

void g() {
  for (const FOR_LIMIT = 3; FOR_LIMIT > 0;) {
    print(FOR_LIMIT);
  }
}
Name constant identifiers using `lowerCamelCase`.
2
3const MAX_VALUE = 100;
Name constant identifiers using `lowerCamelCase`.
4
5const PI = 3.14;
Name constant identifiers using `lowerCamelCase`.
6
7const HTTP_PORT = 80;
Name constant identifiers using `lowerCamelCase`.
8
9enum E { FIRST, second }
Name constant identifiers using `lowerCamelCase`.
11class C {
12 static const DEFAULT_SIZE = 10;
Name constant identifiers using `lowerCamelCase`.
15void f() {
16 const LOCAL_CONST = 1;
Name constant identifiers using `lowerCamelCase`.
20void g() {
21 for (const FOR_LIMIT = 3; FOR_LIMIT > 0;) {

Valid

example.dartdart
// lowerCamelCase constant identifiers.

const maxValue = 100;

const pi = 3.14;

const httpPort = 80;

enum E { first, second }

class C {
  static const defaultSize = 10;
}

void f() {
  const localConst = 1;
  print(localConst);
}

void g() {
  for (const forLimit = 3; forLimit > 0;) {
    print(forLimit);
  }
}

Configure constant-identifier-names

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

falcon.jsonjson
{
  "linter": {
    "rules": {
      "style": {
        "constant-identifier-names": "error"
      }
    }
  }
}

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

example.dartdart
// falcon-ignore lint/style/constant-identifier-names: <reason>