isQualified(instance) {
    const name = (0, util_1.getInstanceName)(instance);
    return (0, shared_utils_1.classify)(name).toLowerCase().indexOf(this.filter) > -1 || (0, shared_utils_1.kebabize)(name).toLowerCase().indexOf(this.filter) > -1;
  }
Check if an instance is qualified.

@param {Vue|Vnode} instance
@return {Boolean}