midnight/lib/log.js

Web framework for building modern web applications

module.exports = (l = 2) => {
  const LEVEL = {
    trace: 0,
    debug: 1,
    info: 2,
    warn: 3,
    error: 4,
    fatal: 5
  };
  let loglevel = l;

  /**
   * @param {Function} clog
   * @param {any[]} args
   * @param {number} level
   */
  const logger = (clog, args, level) => {
    level >= loglevel &&
      clog.apply(
        console,
        [`${new Date().toISOString()} [${level}]`].concat(args)
      );
  };

  return {
    trace: (...args) => logger(console.trace, args, LEVEL.trace),
    debug: (...args) => logger(console.debug, args, LEVEL.debug),
    info: (...args) => logger(console.info, args, LEVEL.info),
    warn: (...args) => logger(console.warn, args, LEVEL.warn),
    error: (...args) => logger(console.error, args, LEVEL.error),
    fatal: (...args) => logger(console.error, args, LEVEL.fatal),
    level: level => {
      loglevel = level;
    }
  };
};