export declare class CorsOriginError extends Error {
    readonly origin: string;
    constructor(origin: string, message: string);
}
export declare function normalizeCorsOrigin(origin: string): string;
export declare function isLoopbackHost(host: string): boolean;
export declare function createCorsOriginMatcher(origins: readonly string[]): (origin: string | undefined, callback: (error: Error | null, allowed?: boolean) => void) => void;
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