import type { SQSClient, Message, QueueAttributeName, MessageSystemAttributeName } from "@aws-sdk/client-sqs";
/**
 * The options for the consumer.
 */
export interface ConsumerOptions {
    /**
     * The SQS queue URL.
     */
    queueUrl: string;
    /**
     * List of queue attributes to retrieve, see [AWS docs](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/Package/-aws-sdk-client-sqs/Variable/QueueAttributeName/).
     * @defaultvalue `[]`
     */
    attributeNames?: QueueAttributeName[];
    /**
     * List of message attributes to retrieve (i.e. `['name', 'address']`).
     * @defaultvalue `[]`
     */
    messageAttributeNames?: string[];
    /**
     * A list of attributes that need to be returned along with each message.
     * @defaultvalue `[]`
     */
    messageSystemAttributeNames?: MessageSystemAttributeName[];
    /** @hidden */
    stopped?: boolean;
    /**
     * The number of messages to request from SQS when polling (default `1`).
     *
     * This cannot be higher than the
     * [AWS limit of 10](https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/quotas-messages.html).
     * @defaultvalue `1`
     */
    batchSize?: number;
    /**
     * The duration (in seconds) that the received messages are hidden from subsequent
     * retrieve requests after being retrieved by a ReceiveMessage request.
     */
    visibilityTimeout?: number;
    /**
     * The duration (in seconds) for which the call will wait for a message to arrive in
     * the queue before returning.
     * @defaultvalue `20`
     */
    waitTimeSeconds?: number;
    /**
     * The duration (in milliseconds) to wait before retrying after an authentication error.
     * @defaultvalue `10000`
     */
    authenticationErrorTimeout?: number;
    /**
     * The duration (in milliseconds) to wait before repolling the queue.
     * @defaultvalue `0`
     */
    pollingWaitTimeMs?: number;
    /**
     * If you want the stop action to wait for the final poll to complete and in-flight messages
     * to be processed before emitting 'stopped' set this to the max amount of time to wait.
     * @defaultvalue `0`
     */
    pollingCompleteWaitTimeMs?: number;
    /**
     * If true, sets the message visibility timeout to 0 after a `processing_error`. You can
     * also specify a different timeout using a number.
     * If you would like to use exponential backoff, you can pass a function that returns
     * a number and it will use that as the value for the timeout.
     * @defaultvalue `false`
     */
    terminateVisibilityTimeout?: boolean | number | ((messages: Message[]) => number);
    /**
     * The interval (in seconds) between requests to extend the message visibility timeout.
     *
     * On each heartbeat the visibility is extended by adding `visibilityTimeout` to
     * the number of seconds since the start of the handler function.
     *
     * This value must less than `visibilityTimeout`.
     */
    heartbeatInterval?: number;
    /**
     * An optional [SQS Client](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/clients/client-sqs/classes/sqsclient.html)
     * object to use if you need to configure the client manually.
     */
    sqs?: SQSClient;
    /**
     * The AWS region.
     * @defaultValue process.env.AWS_REGION || `eu-west-1`
     */
    region?: string;
    /**
     * Set this value to false to ignore the `queueUrl` and use the
     * client's resolved endpoint, which may be a custom endpoint.
     * @defaultValue `true`
     */
    useQueueUrlAsEndpoint?: boolean;
    /**
     * Time in ms to wait for `handleMessage` to process a message before timing out.
     *
     * Emits `timeout_error` on timeout. By default, if `handleMessage` times out,
     * the unprocessed message returns to the end of the queue.
     */
    handleMessageTimeout?: number;
    /**
     * Default to `true`, if you don't want the package to delete messages from sqs
     * set this to `false`.
     * @defaultvalue `true`
     */
    shouldDeleteMessages?: boolean;
    /**
     * By default, the consumer will treat an empty object or array from either of the
     * handlers as a acknowledgement of no messages and will not delete those messages as
     * a result. Set this to `true` to always acknowledge all messages no matter the returned
     * value.
     * @defaultvalue `false`
     */
    alwaysAcknowledge?: boolean;
    /**
     * An `async` function (or function that returns a `Promise`) to be called whenever
     * a message is received.
     *
     * **Message Acknowledgment Behavior:**
     * - Returning `undefined` will **NOT acknowledge** the message (leaves it on queue for retry)
     * - Returning the original message or a processed message will cause the message to be **acknowledged and deleted**
     * - To **explicitly acknowledge** a specific message, return an object containing the MessageId you want to acknowledge
     *
     * **Important:** If `alwaysAcknowledge` is `true`, all messages will be acknowledged regardless of return value.
     *
     * @remarks
     * Returning `void` is discouraged and will be deprecated in a future release. Please return a Message or `undefined`.
     */
    handleMessage?(message: Message): Promise<Message | undefined>;
    /**
     * An `async` function (or function that returns a `Promise`) to be called whenever
     * a batch of messages is received. Similar to `handleMessage` but will receive the
     * list of messages, not each message individually.
     *
     * **If both are set, `handleMessageBatch` overrides `handleMessage`**.
     *
     * **Message Acknowledgment Behavior:**
     * - Returning `undefined` will **NOT acknowledge** any messages (leaves them on queue for retry)
     * - Returning the original message array or a processed array will cause **all messages to be acknowledged and deleted**
     * - To **prevent acknowledgment** of all messages, return `undefined` or an empty array `[]`
     * - To **selectively acknowledge** messages, return an array containing only the messages you want to acknowledge
     *
     * **Important:** If `alwaysAcknowledge` is `true`, all messages will be acknowledged regardless of return value.
     *
     * @remarks
     * Returning `void` is discouraged and will be deprecated in a future release. Please return an array of Messages or `undefined`.
     */
    handleMessageBatch?(messages: Message[]): Promise<Message[] | undefined>;
    /**
     * An `async` function (or function that returns a `Promise`) to be called right
     * before the SQS Client sends a receive message command.
     *
     * This function is usefull if SQS Client module exports have been modified, for
     * example to add middlewares.
     */
    preReceiveMessageCallback?(): Promise<void>;
    /**
     * An `async` function (or function that returns a `Promise`) to be called right
     * after the SQS Client sends a receive message command.
     *
     * This function is usefull if SQS Client module exports have been modified, for
     * example to add middlewares.
     */
    postReceiveMessageCallback?(): Promise<void>;
    /**
     * Set this to `true` if you want to receive additional information about the error
     * that occurred from AWS, such as the response and metadata.
     */
    extendedAWSErrors?: boolean;
    /**
     * Set this to `true` if you want to suppress the warning about FIFO queues.
     * @defaultvalue `false`
     */
    suppressFifoWarning?: boolean;
    /**
     * Set this to `true` if you want to enforce that message handlers must return a value.
     * When enabled, handlers that return `null` will throw an error instead of treating it
     * as "do not acknowledge".
     * @defaultvalue `false`
     *
     * @remarks
     * This option will be turned on by default in a future release.
     */
    strictReturn?: boolean;
}
/**
 * A subset of the ConsumerOptions that can be updated at runtime.
 */
export type UpdatableOptions = "visibilityTimeout" | "batchSize" | "waitTimeSeconds" | "pollingWaitTimeMs";
/**
 * The options for the stop method.
 */
export interface StopOptions {
    /**
     * Default to `false`, if you want the stop action to also abort requests to SQS
     * set this to `true`.
     * @defaultvalue `false`
     */
    abort?: boolean;
}
/**
 * Metadata about the queue that is added to every event
 */
export interface QueueMetadata {
    queueUrl?: string;
}
/**
 * These are the events that the consumer emits.
 * Each event will receive QueueMetadata as the last argument, which is added automatically by the emitter.
 * @example
 * consumer.on('message_received', (message, metadata) => {
 *   console.log(`Received message from queue: ${metadata.queueUrl}`);
 *   console.log(message);
 * });
 */
export interface Events {
    /**
     * Fired after one batch of items (up to `batchSize`) has been successfully processed.
     */
    response_processed: [];
    /**
     * Fired when the queue is empty (All messages have been consumed).
     */
    empty: [];
    /**
     * Fired when a message is received.
     */
    message_received: [Message];
    /**
     * Fired when a message is successfully processed and removed from the queue.
     */
    message_processed: [Message];
    /**
     * Fired when an error occurs interacting with the queue.
     *
     * If the error correlates to a message, that message is included in Params
     */
    error: [Error, Message | Message[] | undefined];
    /**
     * Fired when `handleMessageTimeout` is supplied as an option and if
     * `handleMessage` times out.
     */
    timeout_error: [Error, Message];
    /**
     * Fired when an error occurs processing the message.
     */
    processing_error: [Error, Message];
    /**
     * Fired when requests to SQS were aborted.
     */
    aborted: [];
    /**
     * Fired when the consumer starts its work..
     */
    started: [];
    /**
     * Fired when the consumer finally stops its work.
     */
    stopped: [];
    /**
     * Fired when an option is updated
     */
    option_updated: [UpdatableOptions, ConsumerOptions[UpdatableOptions]];
    /**
     * Fired when the Consumer is waiting for polling to complete before stopping.
     */
    waiting_for_polling_to_complete: [];
    /**
     * Fired when the Consumer has waited for polling to complete and is stopping due to a timeout.
     */
    waiting_for_polling_to_complete_timeout_exceeded: [];
}
/**
 * The error object that is emitted with error events from AWS.
 */
export type AWSError = {
    /**
     * Name, eg. ConditionalCheckFailedException
     */
    readonly name: string;
    /**
     * Human-readable error response message
     */
    message: string;
    /**
     * Non-standard stacktrace
     */
    stack?: string;
    /**
     * Whether the client or server are at fault.
     */
    readonly $fault: "client" | "server";
    /**
     * Represents an HTTP message as received in reply to a request
     */
    readonly $response?: {
        /**
         * The status code of the HTTP response.
         */
        statusCode?: number;
        /**
         * The headers of the HTTP message.
         */
        headers: Record<string, string>;
        /**
         * The body of the HTTP message.
         * Can be: ArrayBuffer | ArrayBufferView | string | Uint8Array | Readable | ReadableStream
         */
        body?: any;
    };
    /**
     * The service that encountered the exception.
     */
    readonly $service?: string;
    /**
     * Indicates that an error MAY be retried by the client.
     */
    readonly $retryable?: {
        /**
         * Indicates that the error is a retryable throttling error.
         */
        readonly throttling?: boolean;
    };
    readonly $metadata: {
        /**
         * The status code of the last HTTP response received for this operation.
         */
        readonly httpStatusCode?: number;
        /**
         * A unique identifier for the last request sent for this operation. Often
         * requested by AWS service teams to aid in debugging.
         */
        readonly requestId?: string;
        /**
         * A secondary identifier for the last request sent. Used for debugging.
         */
        readonly extendedRequestId?: string;
        /**
         * A tertiary identifier for the last request sent. Used for debugging.
         */
        readonly cfId?: string;
        /**
         * The number of times this operation was attempted.
         */
        readonly attempts?: number;
        /**
         * The total amount of time (in milliseconds) that was spent waiting between
         * retry attempts.
         */
        readonly totalRetryDelay?: number;
    };
};