import type { MetadataBearer, MiddlewareStack } from '@smithy/types';
interface AwsClient {
    middlewareStack: MiddlewareStack<any, MetadataBearer>;
}
/**
 * Registers middleware that attaches the WAT header to outbound AWS SDK requests.
 * Only applies to Invoke* operations. No-ops when no WAT is present in context.
 *
 * @param client - Any AWS SDK v3 client instance
 *
 * @example
 * ```typescript
 * import { BedrockAgentCoreClient } from '@aws-sdk/client-bedrock-agentcore'
 * import { withWatPropagation } from 'bedrock-agentcore/identity'
 *
 * const client = new BedrockAgentCoreClient({ region: 'us-west-2' })
 * withWatPropagation(client)
 * ```
 */
export declare function withWatPropagation(client: AwsClient): void;
export {};
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