declare module "cancan" {
  namespace CanCan {
    interface Option {
      instanceOf?: ((instance: any, model: any) => boolean) | undefined;
      createError?: (() => any) | undefined;
    }
  }

  class CanCan {
    constructor(options?: CanCan.Option);

    allow<T>(
      model: any,
      actions: string | ReadonlyArray<string>,
      targets: T | ReadonlyArray<T> | string | ReadonlyArray<string>,
      condition?:
        | object
        | ((performer: any, target: any, options?: any) => boolean)
    ): void;

    can(performer: any, action: string, target: any, options?: any): boolean;

    cannot(performer: any, action: string, target: any, options?: any): boolean;

    authorize(performer: any, action: string, target: any, options?: any): void;

    abilities: {
      model: any;
      action: string;
      target: any;
    }[];
  }

  export = CanCan;
}