import type { AbstractHttpCorsOptions } from '@navios/core';
/**
 * Function type for dynamic origin validation.
 * Called with the request origin and a callback to return the validation result.
 */
export type OriginFunction = (origin: string | undefined, callback: (error: Error | null, allow?: boolean | string) => void) => void;
/**
 * Extended CORS options for the Bun adapter.
 * Extends the core AbstractHttpCorsOptions with support for function-based origin.
 */
export interface BunCorsOptions extends Omit<AbstractHttpCorsOptions, 'origin' | 'logLevel'> {
    /**
     * Configures the Access-Control-Allow-Origin CORS header.
     * Can be a string, boolean, RegExp, array of these, or a function for dynamic validation.
     */
    origin?: string | boolean | RegExp | (string | boolean | RegExp)[] | OriginFunction;
}
/**
 * CORS headers that can be set on a response.
 */
export interface CorsHeaders {
    'Access-Control-Allow-Origin'?: string;
    'Access-Control-Allow-Credentials'?: string;
    'Access-Control-Expose-Headers'?: string;
    'Access-Control-Allow-Headers'?: string;
    'Access-Control-Allow-Methods'?: string;
    'Access-Control-Max-Age'?: string;
    'Cache-Control'?: string;
    Vary?: string;
}
/**
 * Calculates CORS headers for a request based on the provided options.
 *
 * @param requestOrigin - The Origin header from the request
 * @param options - CORS configuration options
 * @returns CORS headers object or null if origin is not allowed
 */
export declare function calculateCorsHeaders(requestOrigin: string | undefined, options: BunCorsOptions): Promise<CorsHeaders | null>;
/**
 * Calculates CORS headers specifically for preflight (OPTIONS) requests.
 *
 * @param requestOrigin - The Origin header from the request
 * @param requestMethod - The Access-Control-Request-Method header
 * @param requestHeaders - The Access-Control-Request-Headers header
 * @param options - CORS configuration options
 * @returns CORS headers object or null if origin is not allowed
 */
export declare function calculatePreflightHeaders(requestOrigin: string | undefined, requestMethod: string | null, requestHeaders: string | null, options: BunCorsOptions): Promise<CorsHeaders | null>;
/**
 * Checks if a request is a CORS preflight request.
 *
 * @param method - The HTTP method of the request
 * @param origin - The Origin header value
 * @param accessControlRequestMethod - The Access-Control-Request-Method header
 * @returns true if this is a preflight request
 */
export declare function isPreflight(method: string, origin: string | null, accessControlRequestMethod: string | null): boolean;
/**
 * Applies CORS headers to a Response object.
 *
 * @param response - The original response
 * @param requestOrigin - The Origin header from the request
 * @param options - CORS configuration options
 * @returns A new Response with CORS headers, or the original if origin not allowed
 */
export declare function applyCorsToResponse(response: Response, requestOrigin: string | null, options: BunCorsOptions | null): Promise<Response>;
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