minium log implementation

log.js

const LOG_LEVELS = ['DEBUG', 'INFO', 'WARN', 'ERROR']
const [LOG_DEBUG, LOG_INFO, LOG_WARN, LOG_ERROR] = LOG_LEVELS;
const LOG_LEVEL = LOG_DEBUG;

function makeLogFunc(level, func = console.log) {
  return LOG_LEVELS.indexOf(level) >= LOG_LEVELS.indexOf(LOG_LEVEL) ? (...msg) => {
    const now = new Date().toLocaleString();
    func(...[now, level, ...msg]);
  } : () => {};
}

const log = {
  debug: makeLogFunc(LOG_DEBUG),
  info: makeLogFunc(LOG_INFO),
  warn: makeLogFunc(LOG_WARN),
  error: makeLogFunc(LOG_ERROR, console.error),
};