import { LoggerService, NAuthLoggerConfig } from '../interfaces/config.interface';
/**
 * NAuth Logger Wrapper
 *
 * Wraps any NestJS-compatible logger and adds features:
 * 1. "NAUTH:" prefix to all messages for easy identification
 * 2. Automatic PII redaction (emails, IPs, tokens, etc.) - enabled by default
 * 3. Optional log level filtering
 * 4. Silent mode if no logger is provided
 *
 * This allows nauth-toolkit to integrate seamlessly with the consuming application's
 * logging infrastructure while maintaining security and compliance.
 *
 * @example
 * ```typescript
 * // With NestJS built-in logger (PII redaction enabled by default)
 * const logger = new NAuthLogger(new Logger('MyApp'));
 * logger.log('User user@example.com signed up');
 * // Output: [MyApp] NAUTH: User u***@***.com signed up
 *
 * // With config options
 * const logger = new NAuthLogger({
 *   instance: new Logger('MyApp'),
 *   enablePiiRedaction: true,  // Default
 *   logLevel: 'debug'
 * });
 *
 * // Disable PII redaction (debugging only)
 * const logger = new NAuthLogger({
 *   instance: myLogger,
 *   enablePiiRedaction: false
 * });
 *
 * // Silent mode (no logger provided)
 * const logger = new NAuthLogger();
 * logger.log('This will not be logged'); // No output
 * ```
 */
export declare class NAuthLogger implements LoggerService {
    private static readonly PREFIX;
    private readonly logger?;
    private readonly piiRedactor;
    private readonly enablePiiRedaction;
    private readonly logLevel?;
    constructor(config?: LoggerService | NAuthLoggerConfig);
    /**
     * Log a message (info level)
     */
    log(message: any, ...optionalParams: any[]): any;
    /**
     * Log an error message
     */
    error(message: any, ...optionalParams: any[]): any;
    /**
     * Log a warning message
     */
    warn(message: any, ...optionalParams: any[]): any;
    /**
     * Log a debug message
     */
    debug(message: any, ...optionalParams: any[]): any;
    /**
     * Log a verbose message
     */
    verbose(message: any, ...optionalParams: any[]): any;
    /**
     * Process message: add prefix and apply PII redaction
     * @private
     */
    private processMessage;
    /**
     * Process optional parameters: apply PII redaction
     * @private
     */
    private processParams;
    /**
     * Check if message should be logged based on log level
     * @private
     */
    private shouldLog;
    /**
     * Check if logger is enabled
     */
    isEnabled(): boolean;
    /**
     * Check if PII redaction is enabled
     */
    isPiiRedactionEnabled(): boolean;
}
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