await redis.lpush("key", "a", "b", "c"); 
const length = await redis.lpushx("key", "d"); 
console.log(length); // 4

​
Arguments

​
key
string
required
The key of the list.
​
elements
...TValue[]
required
One or more elements to push at the head of the list.

​
Response

The length of the list after the push operation.0 if the list did not exist and thus no element was pushed.
await redis.lpush("key", "a", "b", "c"); 
const length = await redis.lpushx("key", "d"); 
console.log(length); // 4