import type { ASTNode, print } from "graphql";
import { ApolloLink } from "@apollo/client/link";
export declare namespace BaseHttpLink {
    /**
     * Options passed to `BaseHttpLink` through [request context](https://apollographql.com/docs/react/api/link/introduction#managing-context). Previous
     * non-terminating links in the link chain also can set these values to
     * customize the behavior of `BaseHttpLink` for each operation.
     *
     * > [!NOTE]
     * > Some of these values can also be provided to the `HttpLink` constructor.
     * > If a value is provided to both, the value in `context` takes precedence.
     */
    interface ContextOptions {
        /**
        * The URL of the GraphQL endpoint to send requests to. Can also be a
        * function that accepts an `ApolloLink.Operation` object and returns the
        * string URL to use for that operation.
        * 
        * @defaultValue "/graphql"
        */
        uri?: string | BaseHttpLink.UriFunction;
        /**
        * An object representing headers to include in every HTTP request.
        * 
        * @example
        * 
        * ```json
        * {
        *   "Authorization": "Bearer 1234"
        * }
        * ```
        */
        headers?: Record<string, string>;
        /**
        * The credentials policy to use for each `fetch` call.
        */
        credentials?: RequestCredentials;
        /**
        * Any overrides of the fetch options argument to pass to the fetch call.
        * 
        * An object containing options to use for each call to `fetch`. If a
        * particular option is not included in this object, the default value of
        * that option is used.
        * 
        * > [!NOTE]
        * > If you set `fetchOptions.method` to `GET`, `HttpLink` follows [standard
        * > GraphQL HTTP GET encoding](http://graphql.org/learn/serving-over-http/#get-request).
        * 
        * See [available options](https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/fetch#Parameters)
        */
        fetchOptions?: RequestInit;
        /**
         * An object that configures advanced functionality, such as support for
         * persisted queries.
         */
        http?: BaseHttpLink.HttpOptions;
    }
    /**
     * Options passed to `BaseHttpLink` through the `http` property of a request
     * context.
     */
    interface HttpOptions {
        /**
        * If `true`, includes the `extensions` field in operations sent to your
        * GraphQL endpoint.
        * 
        * @defaultValue true
        */
        includeExtensions?: boolean;
        /**
         * If `false`, the GraphQL query string is not included in the request. Set
         * this option if you're sending a request that uses a [persisted query](https://www.apollographql.com/docs/react/api/link/persisted-queries/).
         *
         * @defaultValue `true`
         */
        includeQuery?: boolean;
        /**
        * If `true`, header names won't be automatically normalized to lowercase.
        * This allows for non-http-spec-compliant servers that might expect
        * capitalized header names.
        * 
        * @defaultValue false
        */
        preserveHeaderCase?: boolean;
        /**
         * A list of additional `accept` headers to include in the request,
         * as defined in https://datatracker.ietf.org/doc/html/rfc7231#section-5.3.2
         *
         * @example
         *
         * ```json
         * ["application/custom+json;q=1.0"]
         * ```
         */
        accept?: string[];
    }
    namespace Shared {
        /** These options are shared between `BaseHttpLink` and `BaseBatchHttpLink` */
        interface Options {
            /**
             * The URL of the GraphQL endpoint to send requests to. Can also be a
             * function that accepts an `ApolloLink.Operation` object and returns the
             * string URL to use for that operation.
             *
             * @defaultValue "/graphql"
             */
            uri?: string | BaseHttpLink.UriFunction;
            /**
             * If `true`, includes the `extensions` field in operations sent to your
             * GraphQL endpoint.
             *
             * @defaultValue true
             */
            includeExtensions?: boolean;
            /**
             * A function to use instead of calling the [Fetch API](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch) directly
             * when sending HTTP requests to your GraphQL endpoint. The function must
             * conform to the signature of `fetch`.
             *
             * By default, the Fetch API is used unless it isn't available in your
             * runtime environment.
             *
             * See [Customizing `fetch`](https://apollographql.com/docs/react/api/link/introduction#customizing-fetch).
             */
            fetch?: typeof fetch;
            /**
             * An object representing headers to include in every HTTP request.
             *
             * @example
             *
             * ```json
             * {
             *   "Authorization": "Bearer 1234"
             * }
             * ```
             */
            headers?: Record<string, string>;
            /**
             * If `true`, header names won't be automatically normalized to lowercase.
             * This allows for non-http-spec-compliant servers that might expect
             * capitalized header names.
             *
             * @defaultValue false
             */
            preserveHeaderCase?: boolean;
            /**
             * The credentials policy to use for each `fetch` call.
             */
            credentials?: RequestCredentials;
            /**
             * Any overrides of the fetch options argument to pass to the fetch call.
             *
             * An object containing options to use for each call to `fetch`. If a
             * particular option is not included in this object, the default value of
             * that option is used.
             *
             * > [!NOTE]
             * > If you set `fetchOptions.method` to `GET`, `HttpLink` follows [standard
             * > GraphQL HTTP GET encoding](http://graphql.org/learn/serving-over-http/#get-request).
             *
             * See [available options](https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/fetch#Parameters)
             */
            fetchOptions?: RequestInit;
            /**
             * If `true`, unused variables from the operation will not be stripped from
             * the request and will instead be sent to the GraphQL endpoint.
             *
             * @remarks
             * Unused variables are likely to trigger server-side validation errors,
             * per https://spec.graphql.org/draft/#sec-All-Variables-Used.
             * `includeUnusedVariables` can be useful if your server deviates
             * from the GraphQL specification by not strictly enforcing that rule.
             *
             * @defaultValue false
             */
            includeUnusedVariables?: boolean;
            /**
             * A function to use when transforming a GraphQL document into a string. It
             * accepts an `ASTNode` (typically a `DocumentNode`) and the original `print`
             * function as arguments, and is expected to return a string. This option
             * enables you to, for example, use `stripIgnoredCharacters` to remove
             * whitespace from queries.
             *
             * By default the [GraphQL `print` function](https://graphql.org/graphql-js/language/#print) is used.
             *
             * @example
             *
             * ```ts
             * import { stripIgnoredCharacters } from "graphql";
             *
             * const httpLink = new HttpLink({
             *   uri: "/graphql",
             *   print: (ast, originalPrint) => stripIgnoredCharacters(originalPrint(ast)),
             * });
             * ```
             */
            print?: BaseHttpLink.Printer;
        }
    }
    /**
     * Options provided to the `BaseHttpLink` constructor.
     *
     * > [!NOTE]
     * > Some of these options are also available to override in [request context](https://apollographql.com/docs/react/api/link/introduction#managing-context).
     * > Context options override the options passed to the constructor. Treat
     * > these options as default values that are used when the request context
     * > does not override the value.
     */
    interface Options extends Shared.Options {
        /**
         * If `true`, the link uses an HTTP `GET` request when sending query
         * operations to your GraphQL endpoint. Mutation operations continue to use
         * `POST` requests. If you want all operations to use `GET` requests,
         * set `fetchOptions.method` instead.
         *
         * @defaultValue false
         */
        useGETForQueries?: boolean;
    }
    interface Body {
        query?: string;
        operationName?: string;
        variables?: Record<string, any>;
        extensions?: Record<string, any>;
    }
    type Printer = (node: ASTNode, originalPrint: typeof print) => string;
    type UriFunction = (operation: ApolloLink.Operation) => string;
}
/**
 * `BaseHttpLink` is a terminating link that sends a GraphQL operation to a
 * remote endpoint over HTTP. It serves as a base link to `HttpLink`.
 *
 * @remarks
 *
 * `BaseHttpLink` supports both POST and GET requests, and you can configure
 * HTTP options on a per-operation basis. You can use these options for
 * authentication, persisted queries, dynamic URIs, and other granular updates.
 *
 * > [!NOTE]
 * > Prefer using `HttpLink` over `BaseHttpLink`. Use `BaseHttpLink` when you
 * > need to disable client awareness features and would like to tree-shake
 * > the implementation of `ClientAwarenessLink` out of your app bundle.
 *
 * @example
 *
 * ```ts
 * import { BaseHttpLink } from "@apollo/client/link/http";
 *
 * const link = new BaseHttpLink({
 *   uri: "http://localhost:4000/graphql",
 *   headers: {
 *     authorization: `Bearer ${token}`,
 *   },
 * });
 * ```
 */
export declare class BaseHttpLink extends ApolloLink {
    constructor(options?: BaseHttpLink.Options);
}
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