import type { TypedDocumentNode } from "@graphql-typed-document-node/core";
import type { GqlVariables } from "./useGqlOperations.js";
export type GqlSubscriptionStatus = "idle" | "connecting" | "open" | "closed";
export type GqlSubscriptionOptions<TData, TVariables extends GqlVariables> = {
    variables: TVariables;
    /** `false` keeps the subscription closed (`status: "idle"`). Default `true`. */
    enabled?: boolean;
    /** Receives each pushed payload, in server order. */
    onData: (data: TData) => void;
    /** Receives transport failures and payload-level GraphQL errors. */
    onError?: (error: Error) => void;
};
export type GqlSubscriptionResult = {
    status: GqlSubscriptionStatus;
};
/**
 * Consumes a GraphQL subscription over SSE using the context client.
 *
 * Opens on mount and whenever the document/variables change, and aborts the
 * in-flight stream on unmount. A transport failure schedules a reconnect with
 * exponential backoff (capped at 15s); a server-sent `complete` is terminal
 * (`status: "closed"`), as is `enabled: false` (`status: "idle"`, nothing
 * opens). `onData`/`onError` are read through a ref, so handler identity never
 * restarts the stream.
 */
export declare function useGqlSubscription<TData, TVariables extends GqlVariables>(document: TypedDocumentNode<TData, TVariables>, options: GqlSubscriptionOptions<TData, TVariables>): GqlSubscriptionResult;
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