SwiftyBeaver → Firebase Crashlytics Logging Destination (Swift)

CrashlyticsDestination.swift

//
//  CrashlyticsDestination.swift
//  ExampleProject
//
//  Created by emirhankolver on 14.11.2025.
//

import FirebaseCrashlytics
import SwiftyBeaver

nonisolated class CrashlyticsDestination: BaseDestination {

    override func send(
        _ level: SwiftyBeaver.Level,
        msg: String,
        thread: String,
        file: String,
        function: String,
        line: Int,
        context: Any? = nil
    ) -> String? {
        // The file parameter is the entire path to the file and we are only interested
        // in the filename. Because we only want the file name, we split the string on
        // path components and then grab the last component (the filename).
        var filename = file
        if let actualFilename = file.split(separator: "/").last {
            filename = String(actualFilename)
        }

        switch level {
        case .error, .warning:
            let domain = "\(filename):\(line) \(function)"
            // capture current call stack

            let error = NSError(
                domain: domain,
                code: 0,
                userInfo: [
                    NSLocalizedDescriptionKey: msg,
                    "file": file,
                    "function": function,
                    "line": line,
                    "stack": thread,
                ]
            )

            Crashlytics.crashlytics().record(error: error)
            break

        case .info:
            Crashlytics.crashlytics().log(msg)
            break
            
        default:
            break
        }

        return super.send(
            level,
            msg: msg,
            thread: thread,
            file: file,
            function: function,
            line: line
        )
    }
}

Here's example log report at firebase crashlytics:

The result of my old destination is first report and current destination is second report.