index.js

export default function evepaste(paste) {
  if (typeof paste !== "string") return [];

  const rows = paste.split("\n").map((r) => r.split("\t"));

  return rows
    .map((r) => parseRow(r))
    .filter((r) => r !== undefined)
    .reduce((aggregated, item) => {
      const existingItem = aggregated.find(
        (aggItem) => aggItem.typeName === item.typeName
      );
      if (existingItem) {
        existingItem.quantity += item.quantity;
      } else {
        aggregated.push({ ...item });
      }
      return aggregated;
    }, []);
}

function parseRow(row) {
  if (typeof row[0] === "string" && row[0] !== "") {
    // Multibuy totals
    if (row[0] === "Total:") return;

    //  Unpacked or Used charge
    if (row[1] === "") return;

    // Item or Ship
    const quantity = parseInt(row[1].replace(".", ""));
    if (!isNaN(quantity) && !/[a-z]/i.test(row[1]))
      return {
        typeName: row[0].trim(), // trim to remove space padding in contracts of fitted ships
        quantity: quantity,
      };
  }
}