/**
 * Configuration management for CAPTCHA generation
 */
export interface CaptchaConfig {
    security: {
        maxDimensions: {
            width: number;
            height: number;
        };
        minDimensions: {
            width: number;
            height: number;
        };
        maxTextLength: number;
        enableTimingProtection: boolean;
    };
    performance: {
        enableGPU: boolean;
        maxConcurrentGenerations: number;
    };
    defaults: {
        charset: 'ALPHANUMERIC' | 'LETTERS_ONLY' | 'NUMBERS_ONLY' | 'HEX';
        enableDecoys: boolean;
        enableTraces: boolean;
    };
}
export declare const DEFAULT_CONFIG: CaptchaConfig;
export declare function setConfig(config: Partial<CaptchaConfig>): void;
export declare function getConfig(): CaptchaConfig;
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