import type { CORSConfig, CORSHeaderOptions, SyncCORSHeaderOptions } from "./types.js";
export declare function scrubPolicyOwnedCORSHeaders(headers: Headers): boolean;
export declare function applyCORSHeaders(options: CORSHeaderOptions): Promise<Response | void>;
/** Apply CORS synchronously. Promise-returning values still fail closed at runtime. */
export declare function applyCORSHeadersSync(options: SyncCORSHeaderOptions): Response | void;
export declare function shouldApplyCORS(request: Request, config?: boolean | CORSConfig): boolean;
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