import winston from 'winston';
import type { DatadogLoggerConfig } from '../../utils/index.js';
/**
 * Datadog Winston logger configuration and setup
 * Provides a wrapper around Winston logger with Datadog transport integration
 * Supports both console and Datadog HTTP transports with fallback mechanisms
 *
 * @example
 * ```typescript
 * // Initialize the logger
 * const config = {
 *   apiKey: 'your-datadog-api-key',
 *   service: 'my-service',
 *   environment: 'production'
 * };
 * DatadogLogger.initialize(config);
 *
 * // Use logging methods
 * DatadogLogger.info('Application started', { version: '1.0.0' });
 * DatadogLogger.error('Database error', new Error('Connection failed'));
 * ```
 */
export declare class DatadogLogger {
    private static instance;
    private static config;
    /**
     * Initialize the Datadog logger with configuration
     *
     * @param config - The Datadog logger configuration object
     * @returns The initialized Winston logger instance
     * @example
     * ```typescript
     * const config = {
     *   apiKey: 'dd-api-key',
     *   service: 'ai-pr-review',
     *   environment: 'production',
     *   logLevel: 'info'
     * };
     * const logger = DatadogLogger.initialize(config);
     * ```
     */
    static initialize(config: DatadogLoggerConfig): winston.Logger;
    /**
     * Get the configured logger instance
     *
     * @returns The Winston logger instance
     * @throws Error if logger is not initialized
     * @example
     * ```typescript
     * try {
     *   const logger = DatadogLogger.getInstance();
     *   logger.info('Direct Winston usage');
     * } catch (error) {
     *   console.error('Logger not initialized');
     * }
     * ```
     */
    static getInstance(): winston.Logger;
    /**
     * Check if logger is initialized
     *
     * @returns True if the logger is initialized, false otherwise
     * @example
     * ```typescript
     * if (!DatadogLogger.isInitialized()) {
     *   DatadogLogger.initialize(config);
     * }
     * ```
     */
    static isInitialized(): boolean;
    /**
     * Get current configuration
     *
     * @returns The current Datadog logger configuration or null if not set
     * @example
     * ```typescript
     * const config = DatadogLogger.getConfig();
     * if (config) {
     *   console.log(`Service: ${config.service}`);
     * }
     * ```
     */
    static getConfig(): DatadogLoggerConfig | null;
    /**
     * Log debug message
     *
     * @param message - The debug message to log
     * @param meta - Optional metadata object to include with the log
     * @example
     * ```typescript
     * DatadogLogger.debug('Debug information', { userId: '123', action: 'validate' });
     * ```
     */
    static debug(message: string, meta?: Record<string, unknown>): void;
    /**
     * Log info message
     *
     * @param message - The info message to log
     * @param meta - Optional metadata object to include with the log
     * @example
     * ```typescript
     * DatadogLogger.info('User logged in', { userId: '123', sessionId: 'abc' });
     * ```
     */
    static info(message: string, meta?: Record<string, unknown>): void;
    /**
     * Log warning message
     *
     * @param message - The warning message to log
     * @param meta - Optional metadata object to include with the log
     * @example
     * ```typescript
     * DatadogLogger.warn('Rate limit approaching', { currentRate: 90, limit: 100 });
     * ```
     */
    static warn(message: string, meta?: Record<string, unknown>): void;
    /**
     * Log error message
     *
     * @param message - The error message to log
     * @param error - Optional error object or metadata to include with the log
     * @example
     * ```typescript
     * DatadogLogger.error('Database connection failed', new Error('Timeout'));
     * DatadogLogger.error('Validation failed', { field: 'email', value: 'invalid' });
     * ```
     */
    static error(message: string, error?: Error | Record<string, unknown>): void;
    /**
     * Log with custom level
     *
     * @param level - The log level (e.g., 'info', 'debug', 'error')
     * @param message - The message to log
     * @param meta - Optional metadata object to include with the log
     * @example
     * ```typescript
     * DatadogLogger.log('info', 'Custom log entry', { customField: 'value' });
     * DatadogLogger.log('debug', 'Debug information', debugData);
     * ```
     */
    static log(level: string, message: string, meta?: Record<string, unknown>): void;
    /**
     * Update custom metadata that will be included in all future logs
     *
     * @param meta - The metadata object to merge with existing custom metadata
     * @example
     * ```typescript
     * DatadogLogger.updateCustomMeta({ userId: '123', sessionId: 'abc' });
     * // All subsequent logs will include this metadata
     * ```
     */
    static updateCustomMeta(meta: Record<string, unknown>): void;
    /**
     * Set a specific metadata field
     *
     * @param key - The metadata field key
     * @param value - The value to set for the metadata field
     * @example
     * ```typescript
     * DatadogLogger.setMetaField('userId', '123');
     * DatadogLogger.setMetaField('feature', 'pr-review');
     * ```
     */
    static setMetaField(key: string, value: unknown): void;
    /**
     * Remove a metadata field
     *
     * @param key - The metadata field key to remove
     * @example
     * ```typescript
     * DatadogLogger.removeMetaField('temporaryField');
     * // Future logs will not include this field
     * ```
     */
    static removeMetaField(key: string): void;
    /**
     * Get current custom metadata
     *
     * @returns The current custom metadata object
     * @example
     * ```typescript
     * const currentMeta = DatadogLogger.getCustomMeta();
     * console.log('Current metadata:', currentMeta);
     * ```
     */
    static getCustomMeta(): Record<string, unknown>;
}