namespace Microsoft.Extensions.Configuration
{
    [DebuggerDisplay("{DebuggerToString(),nq}")]
    [DebuggerTypeProxy(typeof(ConfigurationManagerDebugView))]
    [DefaultMember("Item")]
    public sealed class ConfigurationManager : IConfiguration, IConfigurationBuilder, IConfigurationManager, IConfigurationRoot, IDisposable
    {
        public string? this[string! key] { get; set; }
    }
}