Remove item from store list?

const itemId = 5;
setMainStore(
  "mylist",
  produce((mylist: number[] | undefined) =>
    mylist?.filter(item => item.id !== itemId.id
  )
)
console.log(mainStore.mylist!);

const itemId = 5;
setMainStore(
  "mylist",
  produce((mylist: number[] | undefined) =>
    mylist?.slice(mylist?.findIndex(item => item.id === itemId), 1)
  )
)
console.log(mainStore.mylist!);