Decode file from bundle

Bundle+decode.swift

import Foundation

extension Bundle {
  func decode<Output: Decodable>(
    _ type: Output.Type,
    filename: String,
    withExtension ext: String,
    decoder: any TopLevelDecoder = JSONDecoder()
  ) throw -> Output {
    guard let fileURL = url(forResource: filename, withExtension: ext) else {
      fatalError("Failed to locate \(filename).\(ext) in \(self.bundleURL.absoluteString).")
    }
    let fileData = try Data(contentsOf: fileURL)
    return try decoder.decode(Output.self, from: fileData)
  }
}