Visionmedia/Debug Logging Levels

debugLevels.js

/**
 * Creates debug instances for different logging levels within your namespace &
 * exposes functions to use them
 * Usage:
 * @example
 * const debug = require('./debugLevels')('unicorn');
 * debug.info('Hello %s', 'world');           // unicorn:info Hello world +0ms
 * debug.error('Oops %O', new Error('damn')); // unicorn:error Oops Error: damn
 *                                            // unicorn:error     at Object.<anonymous> (....)
 *
 * Original `debug` instance is accesible via `debug.debug`
 * so you can still use `debug.debug.enable()` for instance.
 */

'use strict';

const debug = require('debug');

const colors = {
  black :   0,
  red :     1,
  green :   2,
  yellow :  3,
  blue :    4,
  magenta : 5,
  cyan :    6,
  white :   7
};

const levels = {
  trace: colors.cyan,
  log: '',
  info: colors.green,
  warn: colors.yellow,
  error: colors.red,
};

exports = module.exports = namespace => {
  const result = {debug};
  const log = debug(namespace);
  Object.keys(levels).forEach(levelName => {
    result[levelName] = log.extend(levelName);
    result[levelName].color = levels[levelName];
  });

  return result;
};