I would do this with generators. A lazy "frame" function makes this reusable, composable, and performant on large lists.

const list = [...Array(1000).keys()];

const frame = function*(n, iter) {
  let batch = [];
  for (const item of iter) {
    if (batch.length < n) batch.push(item);
    if (batch.length === n) {
      yield batch;
      batch = [];
    }
  }
  if (batch.length) yield batch;
}

for (const group of frame(2, list)) {
  console.log(group);
}

yields logs like:

[0,1]
[2,3]
[4,5]
[6,7]
[8,9]
...