/**
 * Constant-time byte-array comparison.
 *
 * Takes `(Uint8Array, Uint8Array)` rather than strings so the helper stays
 * framework-agnostic and reusable by any caller: hash bytes, raw token
 * bytes, HMAC tags.
 *
 * Algorithm (identical to source):
 *   1. Length mismatch → still run a dummy Web Crypto HMAC over equal-length
 *      input to avoid a branch-timing leak, then return false.
 *   2. Equal length → XOR-accumulate diff across all bytes, return diff === 0.
 *
 * Web Crypto (`crypto.subtle`) is used for the dummy work (not Node's
 * `crypto.timingSafeEqual`) for portability across runtimes (Node 20+, Bun,
 * Deno, edge runtimes) and parity with the original Convex implementation.
 */
export declare function timingSafeEqual(a: Uint8Array, b: Uint8Array): Promise<boolean>;
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