import { CommandLineOptions } from '../CommandLineOptions';
/**
 * Masks sensitive API key in CLI options before logging.
 *
 * @param cliOptions - The command line options to mask
 * @returns A copy of the options with the API key masked as '****'
 *
 * @remarks
 * Creates a shallow copy to avoid mutating the original options.
 * Only masks the key if it exists.
 */
export declare function maskCliOptions(cliOptions: CommandLineOptions): CommandLineOptions;
/**
 * Sanitizes error messages by masking potential tokens and sensitive data.
 *
 * Removes or masks sensitive information that might appear in error messages,
 * stack traces, or error objects before they are logged or displayed.
 *
 * @param error - Error object or string to sanitize
 * @returns Sanitized error message string with sensitive data masked
 *
 * @remarks
 * Security features:
 * - Masks potential API tokens (20+ alphanumeric characters)
 * - Masks "token: value" and "token=value" patterns
 * - Masks "key: value" and "key=value" patterns
 * - Masks "password: value" and "password=value" patterns
 * - Masks "secret: value" and "secret=value" patterns
 * - Preserves stack trace structure while masking sensitive data
 *
 * @example
 * ```typescript
 * const error = new Error('API failed with token: abc123xyz789');
 * const safe = sanitizeError(error);
 * // Returns: "API failed with token: ****"
 *
 * const message = 'Authentication key=secretKey123 invalid';
 * const safe2 = sanitizeError(message);
 * // Returns: "Authentication key: **** invalid"
 * ```
 *
 * @category Security
 * @since 2.1.0
 */
export declare function sanitizeError(error: Error | string): string;
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