/**
 * Content Security Policy helpers.
 *
 * @module bquery/security
 */
/**
 * Generate a nonce for inline scripts/styles.
 * Use with Content-Security-Policy nonce directives.
 *
 * @param length - Nonce length in bytes (default: 16, max: 1024)
 * @returns Cryptographically random nonce string
 * @throws {Error} If crypto.getRandomValues or btoa are not available
 * @throws {RangeError} If length is invalid (negative, non-integer, or exceeds maximum)
 */
export declare const generateNonce: (length?: number) => string;
/**
 * Check if a CSP header is present with specific directive.
 * Useful for feature detection and fallback strategies.
 *
 * @param directive - The CSP directive to check (e.g., 'script-src')
 * @returns True if the directive appears to be enforced
 */
export declare const hasCSPDirective: (directive: string) => boolean;
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