How to use the @phensley/cldr-ext-rbnf/lib/rbnftypes.RuleType.INFINITY function in @phensley/cldr-ext-rbnf

case 'x.x':
              rules.push([RuleType.IMPROPER_FRACTION, inst, 0]);
              if (!comma) {
                rules.push([RuleType.IMPROPER_FRACTION, inst, 1]);
              }
              break;

            case 'x,x':
              rules.push([RuleType.IMPROPER_FRACTION, inst, 1]);
              if (!period) {
                rules.push([RuleType.IMPROPER_FRACTION, inst, 0]);
              }
              break;

            case 'Inf':
              rules.push([RuleType.INFINITY, inst]);
              break;

            case 'NaN':
              rules.push([RuleType.NOT_A_NUMBER, inst]);
              break;
          }
        }
      }
      result.push(rules);
    }
    return result;
  }