import type { MetadataBearer as __MetadataBearer } from "@smithy/types";
import type { GetChangeTokenRequest, GetChangeTokenResponse } from "../models/models_0";
/**
 * @public
 */
export type { __MetadataBearer };
/**
 * @public
 *
 * The input for {@link GetChangeTokenCommand}.
 */
export interface GetChangeTokenCommandInput extends GetChangeTokenRequest {
}
/**
 * @public
 *
 * The output of {@link GetChangeTokenCommand}.
 */
export interface GetChangeTokenCommandOutput extends GetChangeTokenResponse, __MetadataBearer {
}
declare const GetChangeTokenCommand_base: {
    new (input: GetChangeTokenCommandInput): import("@smithy/core/client").CommandImpl<GetChangeTokenCommandInput, GetChangeTokenCommandOutput, import("..").WAFRegionalClientResolvedConfig, import("..").ServiceInputTypes, import("..").ServiceOutputTypes>;
    new (...[input]: [] | [GetChangeTokenCommandInput]): import("@smithy/core/client").CommandImpl<GetChangeTokenCommandInput, GetChangeTokenCommandOutput, import("..").WAFRegionalClientResolvedConfig, import("..").ServiceInputTypes, import("..").ServiceOutputTypes>;
    getEndpointParameterInstructions(): import("@smithy/types").EndpointParameterInstructions;
};
/**
 * <note>
 *             <p>This is <b>AWS WAF Classic</b> documentation. For
 *       more information, see <a href="https://docs.aws.amazon.com/waf/latest/developerguide/classic-waf-chapter.html">AWS
 *       WAF Classic</a> in the developer guide.</p>
 *             <p>
 *                <b>For the latest version of AWS
 *       WAF</b>, use the AWS WAFV2 API and see the <a href="https://docs.aws.amazon.com/waf/latest/developerguide/waf-chapter.html">AWS WAF Developer Guide</a>. With the latest version, AWS WAF has a single set of endpoints for regional and global use. </p>
 *          </note>
 * 		       <p>When you want to create, update, or delete AWS WAF objects, get a change token and include the change token in the create, update, or delete request. Change tokens ensure that your application doesn't submit conflicting requests to AWS WAF.</p>
 * 		       <p>Each create, update, or delete request must use a unique change token. If your application submits a <code>GetChangeToken</code> request
 * 			and then submits a second <code>GetChangeToken</code> request before submitting a create, update, or delete request, the second
 * 			<code>GetChangeToken</code> request returns the same value as the first <code>GetChangeToken</code> request.</p>
 * 		       <p>When you use a change token in a create, update, or delete request, the status of the change token changes to <code>PENDING</code>,
 * 			which indicates that AWS WAF is propagating the change to all AWS WAF servers. Use <code>GetChangeTokenStatus</code> to determine the
 * 			status of your change token.</p>
 * @example
 * Use a bare-bones client and the command you need to make an API call.
 * ```javascript
 * import { WAFRegionalClient, GetChangeTokenCommand } from "@aws-sdk/client-waf-regional"; // ES Modules import
 * // const { WAFRegionalClient, GetChangeTokenCommand } = require("@aws-sdk/client-waf-regional"); // CommonJS import
 * // import type { WAFRegionalClientConfig } from "@aws-sdk/client-waf-regional";
 * const config = {}; // type is WAFRegionalClientConfig
 * const client = new WAFRegionalClient(config);
 * const input = {};
 * const command = new GetChangeTokenCommand(input);
 * const response = await client.send(command);
 * // { // GetChangeTokenResponse
 * //   ChangeToken: "STRING_VALUE",
 * // };
 *
 * ```
 *
 * @param GetChangeTokenCommandInput - {@link GetChangeTokenCommandInput}
 * @returns {@link GetChangeTokenCommandOutput}
 * @see {@link GetChangeTokenCommandInput} for command's `input` shape.
 * @see {@link GetChangeTokenCommandOutput} for command's `response` shape.
 * @see {@link WAFRegionalClientResolvedConfig | config} for WAFRegionalClient's `config` shape.
 *
 * @throws {@link WAFInternalErrorException} (server fault)
 *  <p>The operation failed because of a system problem, even though the request was valid. Retry your request.</p>
 *
 * @throws {@link WAFRegionalServiceException}
 * <p>Base exception class for all service exceptions from WAFRegional service.</p>
 *
 *
 * @example To get a change token
 * ```javascript
 * // The following example returns a change token to use for a create, update or delete operation.
 * const input = { /* empty *\/ };
 * const command = new GetChangeTokenCommand(input);
 * const response = await client.send(command);
 * /* response is
 * {
 *   ChangeToken: "abcd12f2-46da-4fdb-b8d5-fbd4c466928f"
 * }
 * *\/
 * ```
 *
 * @public
 */
export declare class GetChangeTokenCommand extends GetChangeTokenCommand_base {
    /** @internal type navigation helper, not in runtime. */
    protected static __types: {
        api: {
            input: {};
            output: GetChangeTokenResponse;
        };
        sdk: {
            input: GetChangeTokenCommandInput;
            output: GetChangeTokenCommandOutput;
        };
    };
}