import { Extension, Naja } from '../Naja';
declare module '../Naja' {
    interface Options {
        unique?: string | false;
    }
}
export declare class UniqueExtension implements Extension {
    initialize(naja: Naja): void;
    private readonly abortControllers;
    private checkUniqueness;
    private abortPreviousRequest;
    private clearRequest;
}