export type HashName = "SHA-1" | "SHA-256";
/** UTF-8 bytes, backed by a plain `ArrayBuffer` (what Web Crypto takes). */
export declare const utf8: (text: string) => Uint8Array<ArrayBuffer>;
export declare const concatBytes: (...parts: readonly Uint8Array[]) => Uint8Array<ArrayBuffer>;
export declare const toHex: (bytes: Uint8Array) => string;
export declare const toBase64: (bytes: Uint8Array) => string;
/** Standard or URL-safe base64, padded or not. Throws on anything else. */
export declare const fromBase64: (value: string) => Uint8Array<ArrayBuffer>;
/** HMAC of `data` under the UTF-8 bytes of `secret`. */
export declare const hmac: (hash: HashName, secret: string, data: Uint8Array<ArrayBuffer>) => Promise<Uint8Array>;
export declare const digest: (hash: HashName, data: Uint8Array<ArrayBuffer>) => Promise<Uint8Array>;
/** Compare two strings without leaking where they differ. */
export declare const timingSafeEqual: (a: string, b: string) => boolean;
/**
 * A fast, stable 64-bit hash of `text` (two cyrb53-style lanes over its UTF-8
 * bytes), as 16 hex digits. For idempotency keys, not for security: a
 * redelivery of the same text hashes the same.
 */
export declare const stableHash: (text: string) => string;
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