await redis.sadd("set1", "a", "b", "c"); 
await redis.sadd("set2", "c", "d", "e"); 
const union =  await redis.sunion("set1", "set2");
console.log(union); // ["a", "b", "c", "d", "e"]

​
Arguments

​
keys
...string[]
required
The keys of the sets to perform the union operation on.

​
Response

The members of the resulting set.
await redis.sadd("set1", "a", "b", "c"); 
await redis.sadd("set2", "c", "d", "e"); 
const union =  await redis.sunion("set1", "set2");
console.log(union); // ["a", "b", "c", "d", "e"]