code: function exposeFormat(name, path) {
    path = path || name;
    Object.defineProperty(format, name, {
      get() {
        return require(`./${path}.js`);
      },
      configurable: true
    });
  }
docs: /*
  @api private
  method {function} exposeFormat
  Exposes a sub-format on the main format object
  as a lazy-loaded getter.