log.js

/**
 * Emulates a PHP PSR-3-like interface.
 *
 * @type {{emergency: $log.emergency, alert: $log.alert, critical: $log.critical, error: $log.error, warning: $log.warning, notice: $log.notice, info: $log.info, debug: $log.debug, log: $log.log}}
 */

var Logger = function () {
    this.logger = {};

    var psrToConsole = {
        'emergency': 'error',
        'alert':     'error',
        'critical':  'error',
        'error':     'error',
        'warning':   'warn',
        'notice':    'info',
        'info':      'info',
        'debug':     'log',
        'log':       'log',
        // non-psr
        'dump':      'dir',
        'trace':     'trace'
    };


    var t;
    for (var m in psrToConsole) {
        if (psrToConsole.hasOwnProperty(m)) {
            t = psrToConsole[m];
            if (typeof console[t] == 'function') {
                this.logger[m] = console[t].bind(window.console);
            }
        }
    }

    return this.logger
};

$log = new Logger();


/**
 * Tricks IDEs like WebStorm into showing a cross-out through 'console'
 */
var $trickIde$neverDefined$;
if (typeof $trickIde$neverDefined$ === true) {
    /**
     * @name console
     * @Xdeprecated Use $log.debug() instead.
     */
    var console = {};
}