wut?!

bun-modifies-original-arrays.ts

const foo = [
  { name: "Alice", age: 25 },
  { name: "Bob", age: 30 },
  { name: "Charlie", age: 35 },
  { name: "David", age: 40 },
];

export type Item = { name: string; age: number };

export async function foobar(collection: Item[]) {
  const items = [...collection] as (Item & { glitched: boolean })[];

  items.forEach((item, index) => {
    const itemNumber = index;
    if (itemNumber >= 1 && itemNumber <= 3) {
      item.glitched = true;
    } else {
      item.glitched = false;
    }
  });

  return items;
}

const newFoo = await foobar([...foo]);

console.log("original foo:", foo);
console.log("new foo:", newFoo);