Index: app/lib/definitions.ts
===================================================================
--- app/lib/definitions.ts	(revision bac34a33d519ff8091900f9c3b08be1b5d88adf5)
+++ app/lib/definitions.ts	(revision bac34a33d519ff8091900f9c3b08be1b5d88adf5)
@@ -0,0 +1,88 @@
+// This file contains type definitions for your data.
+// It describes the shape of the data, and what data type each property should accept.
+// For simplicity of teaching, we're manually defining these types.
+// However, these types are generated automatically if you're using an ORM such as Prisma.
+export type User = {
+  id: string;
+  name: string;
+  email: string;
+  password: string;
+};
+
+export type Customer = {
+  id: string;
+  name: string;
+  email: string;
+  image_url: string;
+};
+
+export type Invoice = {
+  id: string;
+  customer_id: string;
+  amount: number;
+  date: string;
+  // In TypeScript, this is called a string union type.
+  // It means that the "status" property can only be one of the two strings: 'pending' or 'paid'.
+  status: 'pending' | 'paid';
+};
+
+export type Revenue = {
+  month: string;
+  revenue: number;
+};
+
+export type LatestInvoice = {
+  id: string;
+  name: string;
+  image_url: string;
+  email: string;
+  amount: string;
+};
+
+// The database returns a number for amount, but we later format it to a string with the formatCurrency function
+export type LatestInvoiceRaw = Omit<LatestInvoice, 'amount'> & {
+  amount: number;
+};
+
+export type InvoicesTable = {
+  id: string;
+  customer_id: string;
+  name: string;
+  email: string;
+  image_url: string;
+  date: string;
+  amount: number;
+  status: 'pending' | 'paid';
+};
+
+export type CustomersTableType = {
+  id: string;
+  name: string;
+  email: string;
+  image_url: string;
+  total_invoices: number;
+  total_pending: number;
+  total_paid: number;
+};
+
+export type FormattedCustomersTable = {
+  id: string;
+  name: string;
+  email: string;
+  image_url: string;
+  total_invoices: number;
+  total_pending: string;
+  total_paid: string;
+};
+
+export type CustomerField = {
+  id: string;
+  name: string;
+};
+
+export type InvoiceForm = {
+  id: string;
+  customer_id: string;
+  amount: number;
+  status: 'pending' | 'paid';
+};