code: function fontDetect(content, fallback_font_type, options = {}){
    if (!content) {
      if (!globalOptions.isSilentMode()) console.warn('Content must be specified on knayi.fontDetect.');
      return fallback_font_type || 'en';
    }
  
  	if (content === '')
  		return content;
  
  	if (!mmCharacterRange.test(content))
  		return fallback_font_type || 'en';
  
  	content = content.trim().replace(/\u200B/g, '');
  	fallback_font_type = fallback_font_type || 'zawgyi';
  
    options = globalOptions.detector(options);
  
    if (options.use_myanmartools) {
      var myanmartools_zg_probability = myanmartoolZawgyiDetector.getZawgyiProbability(content);
  
      if (myanmartools_zg_probability < options.myanmartools_zg_threshold[0]) {
    		return 'unicode';
    	} else if (myanmartools_zg_probability > options.myanmartools_zg_threshold[1]) {
    		return 'zawgyi';
    	} else {
    		return fallback_font_type;
    	}
  
    } else {
      var match = {};
  
      for (var type in library.detect) {
    		match[type] = 0;
  
    		for (var i = 0; i < library.detect[type].length; i++) {
    			var rule = library.detect[type][i]
    			var m = content.match(rule);
    			match[type] += (m && m.length) || 0;
    		}
    	}
  
      if (match.unicode > match.zawgyi) {
    		return 'unicode';
    	} else if (match.unicode < match.zawgyi) {
    		return 'zawgyi';
    	} else {
    		return fallback_font_type;
    	}
  
    }
  }
docs: Font Type Detector agent
  @param content Text to make a detection
  @param def Default return format;
  @return unicode ? zawgyi