dispenser too bring async data

Dispenser.js

function Dispenser(filter, sort, requestSize = 25, pageSize) {
    let pages = 0;
    let rowCount = 0;
    let contentsPool = [];
    let items = [];

    Dispenser.rowCounts = _ => rowCount;
    Dispenser.getItem = id => items.find(item => item.dbId == id);

    return async function dispenses() {
        while (pageSize > contentsPool.length) {
            var result = await api.getAll(filter, sort, page++, requestSize);
            rowCount = result.data.rowCount;
            const newRows = result.data.rows;
            contentsPool.splice(Infinity, 0, ...newRows);
            items.splice(Infinity, 0, ...newRows);
            if (page * requestSize >= rowCount) break;
        }
        return contentsPool.splice(0, requestSize);
    }
}