I need receive a launch-time file open event in my app (I.e. I needed to know when it was launched by double-clicking an associated file). However I also need to avoid using NSApplication for... complex reasons.
So I'm trying to register for apple events and briefly run a run loop instead but I'm not having much luck. Is it at all possible to receive apple events without NSApplication?

import AppKit
import os

@main
class Runner: NSObject {
    static let logger = Logger(subsystem: Bundle.main.bundleIdentifier!, category: "debug")
    static func main() throws {
        logger.log("main")

        let runner = Runner()

        NSAppleEventManager.shared().setEventHandler(
            runner,
            andSelector: #selector(handleOpenEvent(_:withReplyEvent:)),
            forEventClass: AEEventClass(kCoreEventClass),
            andEventID: AEEventID(kAEOpenDocuments)
        )
        RunLoop.current.run(until: Date().addingTimeInterval(3))

        try runner.run()
    }

    @objc func handleOpenEvent(_ event: NSAppleEventDescriptor, withReplyEvent reply: NSAppleEventDescriptor) {
        Self.logger.debug("handleOpenEvent")

        let list = event.paramDescriptor(forKeyword: keyDirectObject)
        for i in 1...(list?.numberOfItems ?? 0) {
            if let fileDesc = list?.atIndex(i), let url = fileDesc.fileURLValue {
                Self.logger.log("aeurl: \(url)")
            }
        }
    }

    func run() throws {
        Self.logger.log("run")
    }
}