methodRedisClient.setnxsetnx(key: KeyLike,value: KeyLike): Promise<number>;Set the value of a key, only if the key does not exist@param keyThe key to set@param valueThe value to set@returnsPromise that resolves with 1 if the key was set, 0 if the key was not setReferenced typestype KeyLike = string | ArrayBufferView | Blob