packages/flutter_tools/lib/src/base/common.dart

// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

/// Throw a specialized exception for expected situations
/// where the tool should exit with a clear message to the user
/// and no stack trace unless the --verbose option is specified.
/// For example: network errors.
Never throwToolExit(String? message, { int? exitCode }) {
  throw ToolExit(message, exitCode: exitCode);
}

/// Specialized exception for expected situations
/// where the tool should exit with a clear message to the user
/// and no stack trace unless the --verbose option is specified.
/// For example: network errors.
class ToolExit implements Exception {
  ToolExit(this.message, { this.exitCode });

  final String? message;
  final int? exitCode;

  @override
  String toString() => 'Exception: $message'; // TODO(ianh): Really this should say "Error".
}

/// Indicates to the linter that the given future is intentionally not awaited.
///
/// Has the same functionality as `unawaited` from `package:pedantic`.
///
/// In an async context, it is normally expected than all Futures are awaited,
/// and that is the basis of the lint unawaited_futures which is turned on for
/// the flutter_tools package. However, there are times where one or more
/// futures are intentionally not awaited. This function may be used to ignore a
/// particular future. It silences the unawaited_futures lint.
void unawaited(Future<void>? future) { }