Enterprise platforms,
delivered with senior judgement.

/**
 * @NApiVersion 2.1
 * @NScriptType MapReduceScript
 * Generates per-customer AR aging statements,
 * partitioned by ISO currency. Idempotent & resumable.
 */
define(['N/search', 'N/record', 'N/runtime'],
(search, record, runtime) => {

  const getInputData = () => {
    const searchId = runtime.getCurrentScript()
      .getParameter('custscript_ar_search');
    return search.load({ id: searchId })
      .runPaged({ pageSize: 1000 });
  };

  const map = (context) => {
    const row = JSON.parse(context.value);
    const currency = row.values['currencycode'];

    // Partition by customer+currency ISO,
    // not symbol — AUD & USD both render '$'
    context.write({
      key: `${row.values.customer}|${currency}`,
      value: row
    });
  };

  const reduce = (context) => {
    const [customerId, currencyCode] = context.key.split('|');
    // Group, render, deliver. One block per currency.
    renderStatement(customerId, currencyCode, context.values);
  };

  return { getInputData, map, reduce };
});