old_contents: type $npm$classnames$Classes =
    string |
    {[className: string]: * } |
    Array<string> |
    false |
    void |
    null
  
  declare module 'classnames' {
    declare function exports(
      ...classes: Array<$npm$classnames$Classes>
    ): string;
  }
  
new_contents: type $npm$classnames$Classes =
    | string
    | { [className: string]: * }
    | Array<string>
    | false
    | void
    | null;
  
  declare module 'classnames' {
    declare function exports(...classes: Array<$npm$classnames$Classes>): string;
  }
  
  declare module 'classnames/bind' {
    declare module.exports: $Exports<'classnames'>;
  }
  
subject: update libdef definitions