Template for Shortcuts.app's Swift shell script. You can develop on Xcode Playground then you paste them into Shortcuts.app.

template.swift

import Cocoa
import os


// print debug helper function for Playground envoironment and Shortcuts.app
func log(_ item: String, function: String = #function) {
    let isRunningOnPlayground = CommandLine.arguments.filter({ !$0.isEmpty }).isEmpty
    if isRunningOnPlayground {
        Swift.print("\(function) \(item)")
    } else {
        NSLog("\(function) \(item)")
    }
}

func main() {
    if isRunningOnPlayground {
        // You can change input as you like
        let sampleInput = ["Contents.swift"]
        run(input: sampleInput)
    } else {
        // Pass arguments
        run(input: Array(CommandLine.arguments.suffix(from: 1)))
    }
}

// Your script's entry point
func run(input: [String]) {
    log("\(input)")
}


main()