import type { MetadataBearer as __MetadataBearer } from "@smithy/types";
import type { UpdateChapCredentialsInput, UpdateChapCredentialsOutput } from "../models/models_0";
/**
 * @public
 */
export type { __MetadataBearer };
/**
 * @public
 *
 * The input for {@link UpdateChapCredentialsCommand}.
 */
export interface UpdateChapCredentialsCommandInput extends UpdateChapCredentialsInput {
}
/**
 * @public
 *
 * The output of {@link UpdateChapCredentialsCommand}.
 */
export interface UpdateChapCredentialsCommandOutput extends UpdateChapCredentialsOutput, __MetadataBearer {
}
declare const UpdateChapCredentialsCommand_base: {
    new (input: UpdateChapCredentialsCommandInput): import("@smithy/core/client").CommandImpl<UpdateChapCredentialsCommandInput, UpdateChapCredentialsCommandOutput, import("..").StorageGatewayClientResolvedConfig, import("..").ServiceInputTypes, import("..").ServiceOutputTypes>;
    new (input: UpdateChapCredentialsCommandInput): import("@smithy/core/client").CommandImpl<UpdateChapCredentialsCommandInput, UpdateChapCredentialsCommandOutput, import("..").StorageGatewayClientResolvedConfig, import("..").ServiceInputTypes, import("..").ServiceOutputTypes>;
    getEndpointParameterInstructions(): import("@smithy/types").EndpointParameterInstructions;
};
/**
 * <p>Updates the Challenge-Handshake Authentication Protocol (CHAP) credentials for a
 *          specified iSCSI target. By default, a gateway does not have CHAP enabled; however, for
 *          added security, you might use it. This operation is supported in the volume and tape
 *          gateway types.</p>
 *          <important>
 *             <p>When you update CHAP credentials, all existing connections on the target are closed
 *             and initiators must reconnect with the new credentials.</p>
 *          </important>
 * @example
 * Use a bare-bones client and the command you need to make an API call.
 * ```javascript
 * import { StorageGatewayClient, UpdateChapCredentialsCommand } from "@aws-sdk/client-storage-gateway"; // ES Modules import
 * // const { StorageGatewayClient, UpdateChapCredentialsCommand } = require("@aws-sdk/client-storage-gateway"); // CommonJS import
 * // import type { StorageGatewayClientConfig } from "@aws-sdk/client-storage-gateway";
 * const config = {}; // type is StorageGatewayClientConfig
 * const client = new StorageGatewayClient(config);
 * const input = { // UpdateChapCredentialsInput
 *   TargetARN: "STRING_VALUE", // required
 *   SecretToAuthenticateInitiator: "STRING_VALUE", // required
 *   InitiatorName: "STRING_VALUE", // required
 *   SecretToAuthenticateTarget: "STRING_VALUE",
 * };
 * const command = new UpdateChapCredentialsCommand(input);
 * const response = await client.send(command);
 * // { // UpdateChapCredentialsOutput
 * //   TargetARN: "STRING_VALUE",
 * //   InitiatorName: "STRING_VALUE",
 * // };
 *
 * ```
 *
 * @param UpdateChapCredentialsCommandInput - {@link UpdateChapCredentialsCommandInput}
 * @returns {@link UpdateChapCredentialsCommandOutput}
 * @see {@link UpdateChapCredentialsCommandInput} for command's `input` shape.
 * @see {@link UpdateChapCredentialsCommandOutput} for command's `response` shape.
 * @see {@link StorageGatewayClientResolvedConfig | config} for StorageGatewayClient's `config` shape.
 *
 * @throws {@link InternalServerError} (server fault)
 *  <p>An internal server error has occurred during the request. For more information, see the
 *          error and message fields.</p>
 *
 * @throws {@link InvalidGatewayRequestException} (client fault)
 *  <p>An exception occurred because an invalid gateway request was issued to the service. For
 *          more information, see the error and message fields.</p>
 *
 * @throws {@link StorageGatewayServiceException}
 * <p>Base exception class for all service exceptions from StorageGateway service.</p>
 *
 *
 * @example To update CHAP credentials for an iSCSI target
 * ```javascript
 * // Updates the Challenge-Handshake Authentication Protocol (CHAP) credentials for a specified iSCSI target.
 * const input = {
 *   InitiatorName: "iqn.1991-05.com.microsoft:computername.domain.example.com",
 *   SecretToAuthenticateInitiator: "111111111111",
 *   SecretToAuthenticateTarget: "222222222222",
 *   TargetARN: "arn:aws:storagegateway:us-east-1:111122223333:gateway/sgw-12A3456B/target/iqn.1997-05.com.amazon:myvolume"
 * };
 * const command = new UpdateChapCredentialsCommand(input);
 * const response = await client.send(command);
 * /* response is
 * {
 *   InitiatorName: "iqn.1991-05.com.microsoft:computername.domain.example.com",
 *   TargetARN: "arn:aws:storagegateway:us-east-1:111122223333:gateway/sgw-12A3456B/target/iqn.1997-05.com.amazon:myvolume"
 * }
 * *\/
 * ```
 *
 * @public
 */
export declare class UpdateChapCredentialsCommand extends UpdateChapCredentialsCommand_base {
    /** @internal type navigation helper, not in runtime. */
    protected static __types: {
        api: {
            input: UpdateChapCredentialsInput;
            output: UpdateChapCredentialsOutput;
        };
        sdk: {
            input: UpdateChapCredentialsCommandInput;
            output: UpdateChapCredentialsCommandOutput;
        };
    };
}