/**
 * `tenx_hash` — the portable pattern-identity hash.
 *
 * Byte-for-byte reproduction of the engine's PatternHashEncoder
 * (l1x-inc/util/.../hashing/PatternHashEncoder.java). Contract, locked:
 *
 *   xxHash64 (seed 0, == net.openhft zero-allocation-hashing LongHashFunction.xx())
 *   over the UTF-8 bytes  ->  64-bit result serialized big-endian (8 bytes)
 *   ->  base64url (RFC 4648) without padding  ->  always 11 chars.
 *
 * Zero dependency on purpose: a hand-rolled XXH64 vetted by the shared
 * conformance vectors (test/pattern-hash-vectors.json, identical to the
 * engine's JUnit fixture) is more defensible than trusting an npm xxhash
 * port's edge cases, and it can never silently drift from the engine —
 * a mismatch fails the conformance test on both sides.
 *
 * Do NOT change the algorithm, byte order, or encoding. Every deployed
 * tenx_hash filter in a customer SIEM/forwarder, the engine, and this
 * code must all agree forever.
 */
/**
 * Compute the `tenx_hash` value for a pattern / symbol-sequence string.
 * Returns the 11-char base64url identifier the engine would emit for the
 * same string.
 */
export declare function tenxHash(value: string): string;