export declare const normalize: (s: string) => string;
export declare function luhn(d: string): boolean;
export declare function importHmacKey(secret: string | CryptoKey): Promise<CryptoKey>;
export declare function hmacToken(value: string, key: CryptoKey): Promise<string>;
export declare function isBinaryChunk(chunk: Uint8Array): boolean;
export declare const SECURITY_LIMITS: {
    readonly maxInputLength: 10000000;
    readonly maxPatternMatches: 200;
    readonly chunkSize: 256;
};
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