Unused Import

All imported modules should be required to make the file compile

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

  Key	Value
  severity	warning
  require_explicit_imports	false
  allowed_transitive_imports	[]
  always_keep_imports	[]

Non Triggering Examples

import Dispatch // This is used
dispatchMain()

@testable import Dispatch
dispatchMain()

import Foundation
@objc
class A {}

import UnknownModule
func foo(error: Swift.Error) {}

@_exported import UnknownModule

import Foundation
let 👨‍👩‍👧‍👦 = #selector(NSArray.contains(_:))
👨‍👩‍👧‍👦 == 👨‍👩‍👧‍👦

Triggering Examples

↓import Dispatch
struct A {
  static func dispatchMain() {}
}
A.dispatchMain()

↓import Foundation // This is unused
struct A {
  static func dispatchMain() {}
}
A.dispatchMain()
↓import Dispatch

↓import Foundation
dispatchMain()

↓import Foundation
// @objc
class A {}

↓import Foundation
import UnknownModule
func foo(error: Swift.Error) {}

↓import Swift
↓import SwiftShims
func foo(error: Swift.Error) {}