import { LoggerlessTransportConfig, LoggerlessTransport, LogLayerTransportParams } from '@loglayer/transport';

/**
 * Configuration options for the New Relic transport.
 */
interface NewRelicTransportConfig extends LoggerlessTransportConfig {
    /**
     * The New Relic API key
     */
    apiKey: string;
    /**
     * The New Relic Log API endpoint
     * @default https://log-api.newrelic.com/log/v1
     */
    endpoint?: string;
    /**
     * Optional callback for error handling
     */
    onError?: (err: Error) => void;
    /**
     * Optional callback for debugging log entries before they are sent
     */
    onDebug?: (entry: Record<string, any>) => void;
    /**
     * Whether to use gzip compression
     * @default true
     */
    useCompression?: boolean;
    /**
     * Number of retry attempts before giving up
     * @default 3
     */
    maxRetries?: number;
    /**
     * Base delay between retries in milliseconds
     * @default 1000
     */
    retryDelay?: number;
    /**
     * Whether to respect rate limiting by waiting when a 429 response is received
     * @default true
     */
    respectRateLimit?: boolean;
}
/**
 * NewRelicTransport is responsible for sending logs to New Relic's Log API.
 * It handles validation, compression, retries, and rate limiting according to New Relic's specifications.
 *
 * Features:
 * - Validates payload size (max 1MB)
 * - Validates number of attributes (max 255)
 * - Validates attribute name length (max 255 characters)
 * - Truncates attribute values longer than 4094 characters
 * - Supports gzip compression
 * - Handles rate limiting with configurable behavior
 * - Implements retry logic with exponential backoff
 */
declare class NewRelicTransport extends LoggerlessTransport {
    private apiKey;
    private endpoint;
    private onError?;
    private onDebug?;
    private useCompression;
    private maxRetries;
    private retryDelay;
    private respectRateLimit;
    /**
     * Creates a new instance of NewRelicTransport.
     *
     * @param config - Configuration options for the transport
     * @param config.apiKey - New Relic API key for authentication
     * @param config.endpoint - Optional custom endpoint URL (defaults to New Relic's Log API endpoint)
     * @param config.onError - Optional error callback for handling errors
     * @param config.onDebug - Optional callback for debugging log entries before they are sent
     * @param config.useCompression - Whether to use gzip compression (defaults to true)
     * @param config.maxRetries - Maximum number of retry attempts (defaults to 3)
     * @param config.retryDelay - Base delay between retries in milliseconds (defaults to 1000)
     * @param config.respectRateLimit - Whether to honor rate limiting headers (defaults to true)
     */
    constructor(config: NewRelicTransportConfig);
    /**
     * Processes and ships log entries to New Relic.
     *
     * This method:
     * 1. Validates the message size
     * 2. Creates and validates the log entry
     * 3. Validates the final payload size
     * 4. Asynchronously sends the log entry to New Relic
     *
     * The actual sending is done asynchronously in a fire-and-forget manner to maintain
     * compatibility with the base transport class while still providing retry and error handling.
     *
     * @param params - Log parameters including level, messages, and metadata
     * @param params.logLevel - The severity level of the log
     * @param params.messages - Array of message strings to be joined
     * @param params.data - Optional metadata to include with the log
     * @param params.hasData - Whether metadata is present
     * @returns The original messages array
     * @throws {ValidationError} If the payload exceeds size limits or validation fails
     */
    shipToLogger({ logLevel, messages, data, hasData }: LogLayerTransportParams): any[];
}

export { NewRelicTransport, type NewRelicTransportConfig };