import { Command as $Command } from "@smithy/smithy-client";
import type { MetadataBearer as __MetadataBearer } from "@smithy/types";
import type { AppStreamClientResolvedConfig, ServiceInputTypes, ServiceOutputTypes } from "../AppStreamClient";
import type { DescribeSessionsRequest, DescribeSessionsResult } from "../models/models_0";
/**
 * @public
 */
export type { __MetadataBearer };
export { $Command };
/**
 * @public
 *
 * The input for {@link DescribeSessionsCommand}.
 */
export interface DescribeSessionsCommandInput extends DescribeSessionsRequest {
}
/**
 * @public
 *
 * The output of {@link DescribeSessionsCommand}.
 */
export interface DescribeSessionsCommandOutput extends DescribeSessionsResult, __MetadataBearer {
}
declare const DescribeSessionsCommand_base: {
    new (input: DescribeSessionsCommandInput): import("@smithy/smithy-client").CommandImpl<DescribeSessionsCommandInput, DescribeSessionsCommandOutput, AppStreamClientResolvedConfig, ServiceInputTypes, ServiceOutputTypes>;
    new (input: DescribeSessionsCommandInput): import("@smithy/smithy-client").CommandImpl<DescribeSessionsCommandInput, DescribeSessionsCommandOutput, AppStreamClientResolvedConfig, ServiceInputTypes, ServiceOutputTypes>;
    getEndpointParameterInstructions(): import("@smithy/middleware-endpoint").EndpointParameterInstructions;
};
/**
 * <p>Retrieves a list that describes the streaming sessions for a specified stack and fleet. If a UserId is provided for the stack and fleet,
 *             only streaming sessions for that user are described. If an authentication type is not provided,
 *             the default is to authenticate users using a streaming URL.</p>
 * @example
 * Use a bare-bones client and the command you need to make an API call.
 * ```javascript
 * import { AppStreamClient, DescribeSessionsCommand } from "@aws-sdk/client-appstream"; // ES Modules import
 * // const { AppStreamClient, DescribeSessionsCommand } = require("@aws-sdk/client-appstream"); // CommonJS import
 * // import type { AppStreamClientConfig } from "@aws-sdk/client-appstream";
 * const config = {}; // type is AppStreamClientConfig
 * const client = new AppStreamClient(config);
 * const input = { // DescribeSessionsRequest
 *   StackName: "STRING_VALUE", // required
 *   FleetName: "STRING_VALUE", // required
 *   UserId: "STRING_VALUE",
 *   NextToken: "STRING_VALUE",
 *   Limit: Number("int"),
 *   AuthenticationType: "API" || "SAML" || "USERPOOL" || "AWS_AD",
 *   InstanceId: "STRING_VALUE",
 * };
 * const command = new DescribeSessionsCommand(input);
 * const response = await client.send(command);
 * // { // DescribeSessionsResult
 * //   Sessions: [ // SessionList
 * //     { // Session
 * //       Id: "STRING_VALUE", // required
 * //       UserId: "STRING_VALUE", // required
 * //       StackName: "STRING_VALUE", // required
 * //       FleetName: "STRING_VALUE", // required
 * //       State: "ACTIVE" || "PENDING" || "EXPIRED", // required
 * //       ConnectionState: "CONNECTED" || "NOT_CONNECTED",
 * //       StartTime: new Date("TIMESTAMP"),
 * //       MaxExpirationTime: new Date("TIMESTAMP"),
 * //       AuthenticationType: "API" || "SAML" || "USERPOOL" || "AWS_AD",
 * //       NetworkAccessConfiguration: { // NetworkAccessConfiguration
 * //         EniPrivateIpAddress: "STRING_VALUE",
 * //         EniIpv6Addresses: [ // StringList
 * //           "STRING_VALUE",
 * //         ],
 * //         EniId: "STRING_VALUE",
 * //       },
 * //       InstanceId: "STRING_VALUE",
 * //       InstanceDrainStatus: "ACTIVE" || "DRAINING" || "NOT_APPLICABLE",
 * //     },
 * //   ],
 * //   NextToken: "STRING_VALUE",
 * // };
 *
 * ```
 *
 * @param DescribeSessionsCommandInput - {@link DescribeSessionsCommandInput}
 * @returns {@link DescribeSessionsCommandOutput}
 * @see {@link DescribeSessionsCommandInput} for command's `input` shape.
 * @see {@link DescribeSessionsCommandOutput} for command's `response` shape.
 * @see {@link AppStreamClientResolvedConfig | config} for AppStreamClient's `config` shape.
 *
 * @throws {@link InvalidParameterCombinationException} (client fault)
 *  <p>Indicates an incorrect combination of parameters, or a missing parameter.</p>
 *
 * @throws {@link AppStreamServiceException}
 * <p>Base exception class for all service exceptions from AppStream service.</p>
 *
 *
 * @public
 */
export declare class DescribeSessionsCommand extends DescribeSessionsCommand_base {
    /** @internal type navigation helper, not in runtime. */
    protected static __types: {
        api: {
            input: DescribeSessionsRequest;
            output: DescribeSessionsResult;
        };
        sdk: {
            input: DescribeSessionsCommandInput;
            output: DescribeSessionsCommandOutput;
        };
    };
}