import { type ClientSessionOptions, type SecureClientSessionOptions } from "node:http2";
import { HttpResponse, type HttpHandler, type HttpRequest } from "@smithy/core/protocols";
import type { HttpHandlerOptions, Provider } from "@smithy/types";
/**
 * Represents the http2 options that can be passed to a node http2 client.
 * @public
 */
export interface NodeHttp2HandlerOptions {
    /**
     * The maximum time in milliseconds that a stream may remain idle before it
     * is closed.
     */
    requestTimeout?: number;
    /**
     * The maximum time in milliseconds that a session or socket may remain idle
     * before it is closed.
     * https://nodejs.org/docs/latest-v12.x/api/http2.html#http2_http2session_and_sockets
     */
    sessionTimeout?: number;
    /**
     * Disables processing concurrent streams on a ClientHttp2Session instance. When set
     * to true, a new session instance is created for each request to a URL.
     * **Default:** false.
     * https://nodejs.org/api/http2.html#http2_class_clienthttp2session
     */
    disableConcurrentStreams?: boolean;
    /**
     * Maximum number of concurrent Http2Stream instances per ClientHttp2Session. Each session
     * may have up to 2^31-1 Http2Stream instances over its lifetime.
     * This value must be greater than or equal to 0.
     * https://nodejs.org/api/http2.html#class-http2stream
     */
    maxConcurrentStreams?: number;
    /**
     * A set of raw options that will be passed to http2.connect.
     * https://nodejs.org/api/http2.html#http2connectauthority-options-listener
     */
    nodeHttp2ConnectOptions?: Partial<SecureClientSessionOptions | ClientSessionOptions>;
}
/**
 * This is derived from the smithyContext object. This signals to the NodeHttp2Handler specifically
 * that the connection pool should not be used to acquire a connection. The event stream should
 * have its own new connection.
 *
 * This does not apply to WebSocket event streams, since there is no pooling.
 *
 * @internal
 */
type EventStreamSignal = {
    isEventStream?: boolean;
};
/**
 * A request handler using the node:http2 package.
 * @public
 */
export declare class NodeHttp2Handler implements HttpHandler<NodeHttp2HandlerOptions> {
    private config?;
    private configProvider;
    readonly metadata: {
        handlerProtocol: string;
    };
    private readonly connectionManager;
    /**
     * @returns the input if it is an HttpHandler of any class,
     * or instantiates a new instance of this handler.
     */
    static create(instanceOrOptions?: HttpHandler<any> | NodeHttp2HandlerOptions | Provider<NodeHttp2HandlerOptions | void>): HttpHandler<any> | NodeHttp2Handler;
    constructor(options?: NodeHttp2HandlerOptions | Provider<NodeHttp2HandlerOptions | void>);
    destroy(): void;
    handle(request: HttpRequest, { abortSignal, requestTimeout, isEventStream }?: HttpHandlerOptions & EventStreamSignal): Promise<{
        response: HttpResponse;
    }>;
    updateHttpClientConfig(key: keyof NodeHttp2HandlerOptions, value: NodeHttp2HandlerOptions[typeof key]): void;
    httpHandlerConfigs(): NodeHttp2HandlerOptions;
}
export {};
