sentry/static/app/views/bundleAnalyzer/utils/Logger.js

const LEVELS = ['debug', 'info', 'warn', 'error', 'silent'];

const LEVEL_TO_CONSOLE_METHOD = new Map([
  ['debug', 'log'],
  ['info', 'log'],
  ['warn', 'log'],
]);

class Logger {
  static levels = LEVELS;
  static defaultLevel = 'info';

  constructor(level = Logger.defaultLevel) {
    this.activeLevels = new Set();
    this.setLogLevel(level);
  }

  setLogLevel(level) {
    const levelIndex = LEVELS.indexOf(level);

    if (levelIndex === -1) {
      throw new Error(
        `Invalid log level "${level}". Use one of these: ${LEVELS.join(', ')}`
      );
    }

    this.activeLevels.clear();

    for (const [i, level] of LEVELS.entries()) {
      if (i >= levelIndex) {
        this.activeLevels.add(level);
      }
    }
  }

  _log(level, ...args) {
    // console[LEVEL_TO_CONSOLE_METHOD.get(level) || level](...args);
  }
}

LEVELS.forEach(level => {
  if (level === 'silent') {
    return;
  }

  Logger.prototype[level] = function (...args) {
    if (this.activeLevels.has(level)) {
      this._log(level, ...args);
    }
  };
});

module.exports = Logger;