import { GraphQLResult } from '@aws-amplify/api-graphql';
import { DocumentNode } from 'graphql';
import Observable from 'zen-observable';
export declare enum GraphQLClientAuthMode {
    OpenIDConnect = "OPENID_CONNECT",
    IAM = "AWS_IAM",
    ApiKey = "API_KEY"
}
export type TokenProvider = (() => string | Promise<string>) | string;
export type IAMCredentials = {
    accessKeyId: string;
    secretAccessKey: string;
    sessionToken?: string;
};
export interface GraphQLClientOptions {
    /**
     * GraphQL URL i.e. AppSync URL in most cases.
     */
    graphqlUrl: string;
    /**
     * AWS Region to connect to.
     */
    region: string;
    /**
     * Authentication mode. If not provided, defaults to OPENID_CONNECT - the usual client mode
     */
    authMode?: GraphQLClientAuthMode;
    /**
     * A provider which resolves to the ID token for authentication.
     */
    tokenProvider?: TokenProvider;
    /**
     * If authMode is API_KEY, this is the API key to use for authentication.
     */
    apiKey?: string;
    /**
     * if authMode is IAM, override default credential values with these.
     */
    credentials?: IAMCredentials;
}
/**
 * Interface for GraphQL client operations.
 */
export interface GraphQLClient {
    /**
     * Performs GraphQL query operation.
     *
     * @param options query document, query variables and authentication
     * token (optional). If authentication token is provided then the
     * token provided via the constructor will be ignored.
     * @returns query result.
     */
    query<T>(options: {
        query: string | DocumentNode;
        variables?: any;
        idToken?: string;
    }): Promise<GraphQLResult<T>>;
    /**
     * Performs GraphQL mutation operation.
     *
     * @param options mutation document, mutation variables and authentication
     * token (optional). If authentication token is provided then the
     * token provided via the constructor will be ignored.
     * @returns mutation result.
     */
    mutate<T>(options: {
        mutation: string | DocumentNode;
        variables?: any;
        idToken?: string;
    }): Promise<GraphQLResult<T>>;
    /**
     * Performs GraphQL subscription operation.
     *
     * @param options subscription document, subscription variables and
     * authentication token (optional). If authentication token is provided
     * then the token provided via the constructor will be ignored.
     * @returns observable for receiving subscription notifications.
     */
    subscribe<T>(options: {
        subscription: string | DocumentNode;
        variables?: any;
        idToken?: string;
    }): Promise<Observable<GraphQLResult<T>>>;
}