diff --git a/server/postStart.js b/server/postStart.js
deleted file mode 100644
index 7383a004..00000000
--- a/server/postStart.js
+++ /dev/null
@@ -1,47 +0,0 @@
-import frappe from 'frappe';
-import { createNumberSeries } from 'frappe/model/naming';
-import JournalEntryServer from '../models/doctype/JournalEntry/JournalEntryServer.js';
-import PartyServer from '../models/doctype/Party/PartyServer.js';
-import PaymentServer from '../models/doctype/Payment/PaymentServer.js';
-import PurchaseInvoiceServer from '../models/doctype/PurchaseInvoice/PurchaseInvoiceServer.js';
-import SalesInvoiceServer from '../models/doctype/SalesInvoice/SalesInvoiceServer.js';
-
-export default async function postStart() {
-  // set server-side modules
-  frappe.models.SalesInvoice.documentClass = SalesInvoiceServer;
-  frappe.models.Payment.documentClass = PaymentServer;
-  frappe.models.Party.documentClass = PartyServer;
-  frappe.models.PurchaseInvoice.documentClass = PurchaseInvoiceServer;
-  frappe.models.JournalEntry.documentClass = JournalEntryServer;
-
-  frappe.metaCache = {};
-
-  // init naming series if missing
-  await createNumberSeries('SINV-', 'SalesInvoice');
-  await createNumberSeries('PINV-', 'PurchaseInvoice');
-  await createNumberSeries('PAY-', 'Payment');
-  await createNumberSeries('JV-', 'JournalEntry');
-
-  // fetch singles
-  // so that they are available synchronously
-  await frappe.getSingle('SystemSettings');
-  await frappe.getSingle('AccountingSettings');
-  await frappe.getSingle('GetStarted');
-
-  // cache currency symbols for frappe.format
-  await setCurrencySymbols();
-}
-
-export async function setCurrencySymbols() {
-  frappe.currencySymbols = await frappe.db
-    .getAll({
-      doctype: 'Currency',
-      fields: ['name', 'symbol'],
-    })
-    .then((data) => {
-      return data.reduce((obj, currency) => {
-        obj[currency.name] = currency.symbol;
-        return obj;
-      }, {});
-    });
-}
diff --git a/src/postStart.ts b/src/postStart.ts
new file mode 100644
index 00000000..0196b22f
--- /dev/null
+++ b/src/postStart.ts
@@ -0,0 +1,33 @@
+import frappe from 'frappe';
+import { createNumberSeries } from 'frappe/model/naming';
+import { getValueMapFromList } from 'utils';
+
+export default async function postStart() {
+  await createDefaultNumberSeries();
+  await setSingles();
+  await setCurrencySymbols();
+}
+
+async function createDefaultNumberSeries() {
+  await createNumberSeries('SINV-', 'SalesInvoice');
+  await createNumberSeries('PINV-', 'PurchaseInvoice');
+  await createNumberSeries('PAY-', 'Payment');
+  await createNumberSeries('JV-', 'JournalEntry');
+}
+
+async function setSingles() {
+  await frappe.doc.getSingle('AccountingSettings');
+  await frappe.doc.getSingle('GetStarted');
+}
+
+async function setCurrencySymbols() {
+  const currencies = (await frappe.db.getAll('Currency', {
+    fields: ['name', 'symbol'],
+  })) as { name: string; symbol: string }[];
+
+  frappe.currencySymbols = getValueMapFromList(
+    currencies,
+    'name',
+    'symbol'
+  ) as Record<string, string | undefined>;
+}