import type { FastifyInstance } from 'fastify';
import type { GraphQLYogaOptions } from '@cedarjs/graphql-server';
export interface CedarFastifyGraphQLOptions {
    cedar: {
        apiRootPath?: string;
        graphql?: GraphQLYogaOptions;
        configureServer?: (server: FastifyInstance) => void | Promise<void>;
    };
}
export declare function cedarFastifyGraphQLServer(fastify: FastifyInstance, options: CedarFastifyGraphQLOptions): Promise<void>;
/**
 * Detects errors that indicate the client disconnected before the response
 * finished, rather than a genuine server-side failure.
 *
 * `ERR_STREAM_PREMATURE_CLOSE` can surface from the underlying Node stream
 * closing early. The `DOMException` named `AbortError` is thrown by Yoga
 * when the AbortSignal wired up in `createFetchRequest`'s
 * `reply.raw.on('close', ...)` handler is aborted, which only happens when
 * the client itself has gone away.
 *
 * The `DOMException` check (rather than just `name === 'AbortError'`) is
 * deliberate: a resolver or hook could throw a plain `Error` renamed to
 * `AbortError`, which would otherwise be misclassified as a benign
 * disconnect and hide a real server-side failure behind a 499.
 */
export declare function isClientDisconnectError(e: unknown): boolean;
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