import { Plugin, YogaInitialContext } from 'graphql-yoga';
export interface CSRFPreventionPluginOptions {
    /**
     * List of headers that are required to be set on every request.
     *
     * @default 'x-graphql-yoga-csrf'
     */
    requestHeaders?: string[];
}
/**
 * If you have CORS enabled, almost all requests coming from the browser will have a
 * preflight request - however, some requests are deemed "simple" and don't make a preflight.
 *
 * One example of such a request is a good ol' GET request without any headers, this request can
 * be marked as "simple" and have preflight CORS checks skipped therefore skipping the CORS check.
 *
 * This attack can be mitigated by saying: "all GET requests must have a custom header set". This
 * would force all clients to manipulate the headers of GET requests, marking them as "_not-_simple"
 * and therefore always executing a preflight request.
 */
export declare function useCSRFPrevention(options?: CSRFPreventionPluginOptions): Plugin<YogaInitialContext>;