whenOrNull<TResult extends Object?> method

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? $default(String? authority, String? serviceName, bool? multiMode, @JsonKey.new(name: 'idle_timeout') int? idleTimeout, @JsonKey.new(name: 'health_check_timeout') int? healthCheckTimeout, @JsonKey.new(name: 'permit_without_stream') bool? permitWithoutStream, @JsonKey.new(name: 'initial_windows_size') int? initialWindowsSize, @JsonKey.new(name: 'user_agent') String? userAgent,)?)

A variant of when that fallback to returning null

It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case _:
    return null;
}

Implementation

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? Function( String? authority,  String? serviceName,  bool? multiMode, @JsonKey(name: 'idle_timeout')  int? idleTimeout, @JsonKey(name: 'health_check_timeout')  int? healthCheckTimeout, @JsonKey(name: 'permit_without_stream')  bool? permitWithoutStream, @JsonKey(name: 'initial_windows_size')  int? initialWindowsSize, @JsonKey(name: 'user_agent')  String? userAgent)?  $default,) {final _that = this;
switch (_that) {
case _GRPCConfig() when $default != null:
return $default(_that.authority,_that.serviceName,_that.multiMode,_that.idleTimeout,_that.healthCheckTimeout,_that.permitWithoutStream,_that.initialWindowsSize,_that.userAgent);case _:
  return null;

}
}