import type { CORSPreflightOptions } from "./types.js";
interface ResolvePreflightPolicyOptions {
    config?: unknown;
    allowMethods?: unknown;
    allowHeaders?: unknown;
    requestedHeaders?: unknown;
}
interface ResolvedPreflightPolicy {
    methods: string;
    headers: string;
}
export declare function normalizeCORSPreflightList(value: unknown): string[] | null;
export declare function resolveCORSPreflightPolicy(options: ResolvePreflightPolicyOptions): ResolvedPreflightPolicy;
export declare function handleCORSPreflight(options: CORSPreflightOptions): Promise<Response>;
export declare function isPreflightRequest(request: Request): boolean;
export {};
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