Extension Access Modifier

Prefer to use extension access modifiers

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

  Key	Value
  severity	warning

Non Triggering Examples

extension Foo: SomeProtocol {
  public var bar: Int { return 1 }
}

extension Foo {
  private var bar: Int { return 1 }
  public var baz: Int { return 1 }
}

extension Foo {
  private var bar: Int { return 1 }
  public func baz() {}
}

extension Foo {
  var bar: Int { return 1 }
  var baz: Int { return 1 }
}

extension Foo {
  var bar: Int { return 1 }
  internal var baz: Int { return 1 }
}

internal extension Foo {
  var bar: Int { return 1 }
  var baz: Int { return 1 }
}

public extension Foo {
  var bar: Int { return 1 }
  var baz: Int { return 1 }
}

public extension Foo {
  var bar: Int { return 1 }
  internal var baz: Int { return 1 }
}

extension Foo {
  private var bar: Int { return 1 }
  private var baz: Int { return 1 }
}

extension Foo {
  open var bar: Int { return 1 }
  open var baz: Int { return 1 }
}

extension Foo {
    func setup() {}
    public func update() {}
}

private extension Foo {
  private var bar: Int { return 1 }
  var baz: Int { return 1 }
}

extension Foo {
  internal private(set) var bar: Int {
    get { Foo.shared.bar }
    set { Foo.shared.bar = newValue }
  }
}

extension Foo {
  private(set) internal var bar: Int {
    get { Foo.shared.bar }
    set { Foo.shared.bar = newValue }
  }
}

public extension Foo {
  private(set) var value: Int { 1 }
}

Triggering Examples

↓extension Foo {
   public var bar: Int { return 1 }
   public var baz: Int { return 1 }
}

↓extension Foo {
   public var bar: Int { return 1 }
   public func baz() {}
}

public extension Foo {
  ↓public func bar() {}
  ↓public func baz() {}
}

↓extension Foo {
   public var bar: Int {
      let value = 1
      return value
   }

   public var baz: Int { return 1 }
}

↓extension Array where Element: Equatable {
    public var unique: [Element] {
        var uniqueValues = [Element]()
        for item in self where !uniqueValues.contains(item) {
            uniqueValues.append(item)
        }
        return uniqueValues
    }
}

↓extension Foo {
   #if DEBUG
   public var bar: Int {
      let value = 1
      return value
   }
   #endif

   public var baz: Int { return 1 }
}

public extension Foo {
  ↓private func bar() {}
  ↓private func baz() {}
}

↓extension Foo {
  private(set) public var value: Int { 1 }
}