Take a look at this code snippet:
const arr = [1,2,3]
const res1 = arr.slice()
const res2 = Object.assign([],arr)
When using arr.slice() to create a shallow clone, the resulting array res1 will have a type of number[], just like the original arr. However, if you use Object.assign() instead, the array res2 will have a type of never[] & number[].
But why does the type of res2 include never[]? How can it be both number[] and never[] at the same time (using the & operator)?