import { APIResponse } from "../types.js";
import { ERPApiConfig } from "../types.js";
export declare class GraphQLService {
    private client;
    private config;
    private endpoint;
    constructor(config: ERPApiConfig, endpoint: string, retryAttempts?: number, timeoutSeconds?: number);
    private getHeaders;
    /**
     * Handles a GraphQL response, properly handling both successful responses
     * and GraphQL-level errors (which come in a 200 HTTP response)
     *
     * From the GraphQL specification (https://spec.graphql.org/draft/#sec-Errors):
  >  *     "When a GraphQL server encounters an error, it should return a response with a
  >  *      top-level "errors" field containing the error information. The response may still contain
     *      a partial result in the "data" field if the error occurred after some data was already resolved."
     *
     * And specifically about HTTP status codes:
     *     "A server should return a 200 status code when a GraphQL operation successfully executes, including when
     *      the operation returns errors. A server should return a 400 status code when a GraphQL operation fails to execute."
     */
    private handleGraphQLResponse;
    /**
     * Executes a GraphQL query
     * @param query The GraphQL query string
     * @param variables Optional variables for the query
     * @returns The query result
     * @throws {HTTPError} For HTTP/network errors only
     */
    query<T>(query: string, variables?: Record<string, unknown>): Promise<APIResponse<T>>;
    /**
     * Executes a GraphQL mutation
     * @param mutation The GraphQL mutation string
     * @param variables Optional variables for the mutation
     * @returns The mutation result
     * @throws {HTTPError} For HTTP/network errors only
     */
    mutate<T>(mutation: string, variables?: Record<string, unknown>): Promise<APIResponse<T>>;
    /**
     * Cleanup all HTTP connections and resources
     * Call this when the service is no longer needed
     */
    destroy(): Promise<void>;
}
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