avoid-duplicate-factories

v1.38.0

warning

effort: 3m

has IDE fix

pro+

Warns when a class has a factory constructor with the same implementation as another factory constructor.

This rule does not take into account parameter/factory names and other insignificant details.

Example

❌ Bad:

class SomeClass {
  SomeClass(String data);

  factory SomeClass.fromString(String data) => SomeClass(data);
  // LINT: This factory constructor is a duplicate of SomeClass.fromString.
  //  Try removing this factory or adding unique functionality.
  factory SomeClass.parse(String data) => SomeClass(data);
}

class SomeClass {
  SomeClass();

  factory SomeClass.empty() => SomeClass();
  // LINT: This factory constructor is a duplicate of SomeClass.empty.
  //  Try removing this factory or adding unique functionality.
  factory SomeClass.withData(String data) => SomeClass();
}

✅ Good:

class SomeClass {
  SomeClass(String data);

  factory SomeClass.fromString(String data) => SomeClass(data);
}

Additional Resources

• CWE-1164: Irrelevant Code