【Swift】jsonのdecodeにはジェネリクス型を使うと幸せになれる

import Foundation
extension Bundle{
    func decode<T:Codable>(_ file:String)->T{
        //URLの取得
        guard let url = self.url(forResource: file, withExtension: nil) else{
            fatalError()
        }
        //データの取得
        guard let data = try? Data(contentsOf: url) else{
            fatalError()
        }
        
        let decoder = JSONDecoder()
        //デコード
        guard let loaded = try? decoder.decode(T.self, from: data)else {
            fatalError()
        }
        
        return loaded
        
    }
}

let peoples:[String:Person] = Bundle.main.decode("peoples.json")