import type { allowedMethods } from "./types.js";
/**
 * an inbuilt CORS post middleware
 *    @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer/Planned_changes
 *  - {Boolean} privateNetworkAccess handle `Access-Control-Request-Private-Network` request by return `Access-Control-Allow-Private-Network`, default to false
 *    @see https://wicg.github.io/private-network-access/
 */
export declare const optionsCtx: {
    payload: undefined;
    _2: {
        Vary: string;
        Connection: string;
    };
    _6: boolean;
    code: number;
    set(field: string, value: string): void;
    request: {
        method: string;
    };
};
export declare const createCorsHeaders: () => Record<string, string>;
export declare let baseCorsHeaders: Record<string, string>;
export declare function corsMiddleware(options: {
    exposeHeaders?: string[];
    allowMethods?: allowedMethods;
    allowHeaders?: string[];
    keepHeadersOnError?: boolean;
    maxAge?: string;
    credentials?: boolean;
    secureContext?: {
        "Cross-Origin-Opener-Policy": "same-origin" | "unsafe-none" | "same-origin-allow-popups";
        "Cross-Origin-Embedder-Policy": "require-corp" | "unsafe-none";
    };
    privateNetworkAccess?: unknown;
    origin?: string[];
}): void;