text: // Copyright Joyent, Inc. and other Node contributors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a
  // copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to permit
  // persons to whom the Software is furnished to do so, subject to the
  // following conditions:
  //
  // The above copyright notice and this permission notice shall be included
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  // USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  var util = require('util');
  
  function Console(stdout, stderr) {
    if (!(this instanceof Console)) {
      return new Console(stdout, stderr);
    }
    if (!stdout || !util.isFunction(stdout.write)) {
      throw new TypeError('Console expects a writable stream instance');
    }
    if (!stderr) {
      stderr = stdout;
    }
    var prop = {
      writable: true,
      enumerable: false,
      configurable: true
    };
    prop.value = stdout;
    Object.defineProperty(this, '_stdout', prop);
    prop.value = stderr;
    Object.defineProperty(this, '_stderr', prop);
    prop.value = {};
    Object.defineProperty(this, '_times', prop);
  
    // bind the prototype functions to this Console instance
    var keys = Object.keys(Console.prototype);
    for (var v = 0; v < keys.length; v++) {
      var k = keys[v];
      this[k] = this[k].bind(this);
    }
  }
  
  Console.prototype.log = function() {
    this._stdout.write(util.format.apply(this, arguments) + '\n');
  };
  
  
  Console.prototype.info = Console.prototype.log;
  
  
  Console.prototype.warn = function() {
    this._stderr.write(util.format.apply(this, arguments) + '\n');
  };
  
  
  Console.prototype.error = Console.prototype.warn;
  
  
  Console.prototype.dir = function(object, options) {
    this._stdout.write(util.inspect(object, util._extend({
      customInspect: false
    }, options)) + '\n');
  };
  
  
  Console.prototype.time = function(label) {
    this._times[label] = Date.now();
  };
  
  
  Console.prototype.timeEnd = function(label) {
    var time = this._times[label];
    if (!time) {
      throw new Error('No such label: ' + label);
    }
    var duration = Date.now() - time;
    this.log('%s: %dms', label, duration);
  };
  
  
  Console.prototype.trace = function() {
    // TODO probably can to do this better with V8's debug object once that is
    // exposed.
    var err = new Error;
    err.name = 'Trace';
    err.message = util.format.apply(this, arguments);
    Error.captureStackTrace(err, arguments.callee);
    this.error(err.stack);
  };
  
  
  Console.prototype.assert = function(expression) {
    if (!expression) {
      var arr = Array.prototype.slice.call(arguments, 1);
      require('assert').ok(false, util.format.apply(this, arr));
    }
  };
  
  
  module.exports = new Console(process.stdout, process.stderr);
  module.exports.Console = Console;
  