how to add swiftlint to third party packages

To add SwiftLint to third-party packages, you can follow these general steps:

1. Add SwiftLint as a Dependency: You need to add SwiftLint as a dependency in your Package.swift file. This can be done by including it in the dependencies array.

   // swift-tools-version:5.3
   import PackageDescription
   
   let package = Package(
       name: "YourPackageName",
       dependencies: [
           .package(url: "https://github.com/realm/SwiftLint.git", from: "0.43.0")
       ],
       targets: [
           .target(
               name: "YourTargetName",
               dependencies: ["SwiftLint"]
           )
       ]
   )
   

2. Configure SwiftLint: Create a .swiftlint.yml file in the root of your package to configure the rules and settings for SwiftLint.

   disabled_rules: # rule identifiers to exclude from running
     - line_length
     - type_name
   
   opt_in_rules: # some rules are only opt-in
     - empty_count
     - missing_docs
   
   included: # paths to include during linting. `--path` is ignored if present.
     - Source
   
   excluded: # paths to ignore during linting. Takes precedence over `included`.
     - Carthage
     - Pods
   

3. Run SwiftLint: You can run SwiftLint manually from the command line or integrate it into your build process. To run it manually, navigate to your package directory and execute:

   swift run swiftlint
   

4. Integrate with Xcode: If you are using Xcode, you can add a build phase to run SwiftLint automatically. Go to your Xcode project settings, select your target, and add a new "Run Script Phase" with the following script:

   if which swiftlint >/dev/null; then
     swiftlint
   else
     echo "warning: SwiftLint not installed, download from https://github.com/realm/SwiftLint"
   fi
   

For more detailed information on working with Swift packages, you can refer to the session A Swift Tour: Explore Swift’s features and design.