How to add SwiftLint to Swift Vapor project

Question

I'm trying to add SwiftLint to my Swift Vapor project but had no luck figuring out these errors.

Full Package.swift code:

import PackageDescription

let package = Package(
    name: "VaporApp",
    platforms: [
       .macOS(.v10_15)
    ],
    dependencies: [
        //  A server-side Swift web framework.
        .package(url: "https://github.com/vapor/vapor.git", from: "4.0.0"),
        .package(url: "https://github.com/realm/SwiftLint.git", from: "0.50.3")
    ],
    targets: [
        .target(
            name: "App",
            dependencies: [
                .product(name: "Vapor", package: "vapor")
            ],
            swiftSettings: [
                .unsafeFlags(["-cross-module-optimization"], .when(configuration: .release))
            ],
            plugins: [.plugin(name: "SwiftLintPlugin", package: "SwiftLint")]
        ),
        .target(name: "Run", dependencies: [.target(name: "App")]),
        .testTarget(name: "AppTests", dependencies: [
            .target(name: "App"),
            .product(name: "XCTVapor", package: "vapor"),
        ])
    ]
)

Update: Above errors were fixed after setting swift-tools-version to ^5.6 // swift-tools-version:5.6

But now having another issue. I have tried resetting package caches and upgrading packages.

Answer 1

You need to set your tools version in the Package.swift file to at least 5.6