Isomorphic Logger

logger.js

/*eslint-disable no-console */

var LOG_METHODS = ['debug', 'error', 'info', 'warn'];

function log() {
    if (!console || !console.log) {
        return;
    }
    console.log.apply(console, arguments);
}

function proxyLog(logMethod, label) {
    return function() {
        var args = Array.prototype.slice.call(arguments);
        label = label && label.toUpperCase();

        if (console && console[logMethod]) {
            if (label) {
                args.unshift('[' + label + ']');
            }
            console[logMethod].apply(console, args);
            return;
        }

        args.unshift('[' + label || logMethod.toUpperCase() + ']');
        log.apply(log, args);
    };
}

for (var i = 0; i < LOG_METHODS.length; i++) {
    var logMethod = LOG_METHODS[i];
    log[logMethod] = proxyLog(logMethod);
}

log.deprecate = proxyLog('warn', 'deprecation');

module.exports = log;