logger.js 3.79 KB
define(['exports', 'module', './utils'], function (exports, module, _utils) {
  'use strict';

  var logger = {
    methodMap: ['debug', 'info', 'warn', 'error'],
    level: 'info',

    // Maps a given level value to the `methodMap` indexes above.
    lookupLevel: function lookupLevel(level) {
      if (typeof level === 'string') {
        var levelMap = _utils.indexOf(logger.methodMap, level.toLowerCase());
        if (levelMap >= 0) {
          level = levelMap;
        } else {
          level = parseInt(level, 10);
        }
      }

      return level;
    },

    // Can be overridden in the host environment
    log: function log(level) {
      level = logger.lookupLevel(level);

      if (typeof console !== 'undefined' && logger.lookupLevel(logger.level) <= level) {
        var method = logger.methodMap[level];
        if (!console[method]) {
          // eslint-disable-line no-console
          method = 'log';
        }

        for (var _len = arguments.length, message = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
          message[_key - 1] = arguments[_key];
        }

        console[method].apply(console, message); // eslint-disable-line no-console
      }
    }
  };

  module.exports = logger;
});
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