index.js

var util = require('util');
var clc = require('cli-color');
var notice = clc.cyanBright.bold;
var error = clc.red.bold;
var warn = clc.yellow;

// Setup logging functions
var inspect = function(message) {
  util.log(util.inspect(message, {colors:true}))
};

var _log = function (message, level) {
  if(typeof level === 'undefined')
    level = notice
  util.log(level(message));
};

var notice = function(message){
  _log(message, notice);
};

var warn = function(message){
  _log(message, warn);
};

var error = function(message){
  _log(message, error);
};

exports.inspect = inspect;
exports.notice = notice;
exports.warn = warn;
exports.error = error;

console.log('Loaded')

repl.js

#!/usr/bin/env node

var log = require("./index");
require('repl').start({useGlobal:true});