import { APIResponse, Fetcher, FetchFunction } from '../../core';
import { Middleware } from '../middleware';
export declare const CSRF_HEADER = "X-CSRF-Token";
export declare const SAFE_HTTP_METHODS: string[];
export type Token = string;
export type HttpTextResponse = {
    ok: boolean;
    text: () => Promise<string>;
};
type CsrfHttpClient = (url: string, method: 'POST') => Promise<HttpTextResponse>;
export declare class CsrfMiddleware implements Middleware<unknown> {
    private options;
    constructor(options?: {
        attachExternalHeaderToRequests?: boolean;
        csrfEndpoint?: string;
        csrfHttpClient?: CsrfHttpClient;
    });
    protected token: Token | undefined;
    protected issueCsrfToken(): Promise<Token>;
    protected setCsrfToken(token: Token): void;
    protected getCsrfToken(): Token | undefined;
    protected configureCsrf(): Promise<Token>;
    protected verify(): Promise<string>;
    process(args: Fetcher.Args, next: FetchFunction): Promise<APIResponse<unknown, Fetcher.Error>>;
}
export {};
//# sourceMappingURL=csrf.d.ts.map