sdk/lib/developer/developer.dart

// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

/// Interact with developer tools such as the debugger and inspector.
///
/// The dart:developer library is _unstable_ and its API might change slightly
/// as a result of developer feedback. This library is platform dependent and
/// therefore it has implementations for both dart2js and the Dart VM. Both are
/// under development and may not support all operations yet.
///
/// To use this library in your code:
///
///     import 'dart:developer';
///
library dart.developer;

import 'dart:async';
import 'dart:convert';
import 'dart:isolate' show Isolate, RawReceivePort, SendPort;

part 'extension.dart';
part 'profiler.dart';
part 'timeline.dart';
part 'service.dart';

/// If [when] is true, stop the program as if a breakpoint were hit at the
/// following statement.
///
/// Returns the value of [when]. Some debuggers may display [message].
///
/// NOTE: When invoked, the isolate will not return until a debugger
/// continues execution. When running in the Dart VM the behaviour is the same
/// regardless of whether or not a debugger is connected. When compiled to
/// JavaScript, this uses the "debugger" statement, and behaves exactly as
/// that does.
external bool debugger({bool when: true, String message});

/// Send a reference to [object] to any attached debuggers.
///
/// Debuggers may open an inspector on the object. Returns the argument.
external Object inspect(Object object);

/// Emit a log event.
/// [message] is the log message.
/// [time]  (optional) is the timestamp.
/// [sequenceNumber]  (optional) is a monotonically increasing sequence number.
/// [level]  (optional) is the severity level (value between 0 and 2000).
/// [name]  (optional) is the name of the source of the log message.
/// [zone]  (optional) the zone where the log was emitted
/// [error]  (optional) an error object associated with this log event.
/// [stackTrace]  (optional) a stack trace associated with this log event.
external void log(String message,
                  {DateTime time,
                   int sequenceNumber,
                   int level: 0,
                   String name: '',
                   Zone zone,
                   Object error,
                   StackTrace stackTrace});