Interface SqsClient

Structural shape of the SQS client the adapter calls: just the send method, so a real SQSClient from @aws-sdk/client-sqs satisfies it and a test can pass a plain object. The adapter never imports the SDK; the caller creates and owns the client.

interface SqsClient {
    send(
        command: SqsCommand,
        options?: { abortSignal?: AbortSignal },
    ): Promise<Record<string, unknown>>;
}