code: function validContents(contents) {
      return _underscore2.default.isString(contents) || _underscore2.default.isNumber(contents) || _underscore2.default.isArray(contents) || _underscore2.default.isBoolean(contents) || _underscore2.default.isFunction(contents) || contents instanceof Element || contents instanceof SVGElement || contents instanceof RawHtml || contents instanceof _jquery2.default || contents instanceof rx.ObsCell || contents instanceof rx.ObsArray || contents instanceof rx.ObsSet;
    }
docs: arguments to a tag may be: () (attrs: Object) (contents: Contents) (attrs: Object, contents: Contents) where Contents is: string | number | Element | RawHtml | $ | Array | ObsCell | ObsArray