Override in Extension

Extensions shouldn’t override declarations

• Identifier: override_in_extension
• Enabled by default: No
• Supports autocorrection: No
• Kind: lint
• Analyzer rule: No
• Minimum Swift compiler version: 5.0.0
• Default configuration:

  Key	Value
  severity	warning

Non Triggering Examples

extension Person {
  var age: Int { return 42 }
}

extension Person {
  func celebrateBirthday() {}
}

class Employee: Person {
  override func celebrateBirthday() {}
}

class Foo: NSObject {}
extension Foo {
    override var description: String { return "" }
}

struct Foo {
    class Bar: NSObject {}
}
extension Foo.Bar {
    override var description: String { return "" }
}

Triggering Examples

extension Person {
  override ↓var age: Int { return 42 }
}

extension Person {
  override ↓func celebrateBirthday() {}
}