import { CSPDirective, SecurityEvent } from './types.js';
/**
 * Content Security Policy (CSP) service for miura Framework
 * Handles CSP generation, validation, and enforcement
 */
export declare class CSPService {
    private static instance;
    private directives;
    private eventListeners;
    private constructor();
    static getInstance(): CSPService;
    /**
     * Generate CSP policy string (for meta or header)
     */
    generateCSPPolicyString({ forMeta }?: {
        forMeta?: boolean;
    }): string;
    /**
     * Generate CSP header string (for HTTP header)
     */
    generateCSPHeader(reportOnly?: boolean): string;
    /**
     * Set CSP directive
     */
    setDirective(directive: keyof CSPDirective, sources: string[] | boolean): void;
    /**
     * Add source to directive
     */
    addSource(directive: keyof CSPDirective, source: string): void;
    /**
     * Remove source from directive
     */
    removeSource(directive: keyof CSPDirective, source: string): void;
    /**
     * Validate CSP directive
     */
    validateDirective(directive: string, sources: string[]): {
        valid: boolean;
        errors: string[];
    };
    /**
     * Apply CSP to current page (via <meta> tag)
     */
    applyToPage(reportOnly?: boolean): void;
    /**
     * Handle CSP violation reports
     */
    handleViolation(violation: any): void;
    /**
     * Get current directives
     */
    getDirectives(): CSPDirective;
    /**
     * Add event listener
     */
    on(event: string, callback: (event: SecurityEvent) => void): void;
    /**
     * Remove event listener
     */
    off(event: string, callback: (event: SecurityEvent) => void): void;
    private getDefaultDirectives;
    private isValidSource;
    private isUnsafeSource;
    private emitSecurityEvent;
}
export declare const csp: CSPService;
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