Fix types in filter comparison, expose INVOICE_EVENT_TIMESTAMP_TYPES …

…for test (unfortunately)

index.test.ts

@@ -1,5 +1,5 @@
 import { getMeta, resetMeta } from '@posthog/plugin-scaffold/test/utils.js'
-import { setupPlugin, jobs, runEveryMinute } from './index'
+import { setupPlugin, jobs, runEveryMinute, INVOICE_EVENT_TIMESTAMP_TYPES } from './index'
 import 'jest'
 
 global.fetch = jest.fn(async (url) => ({
@@ -43,6 +43,7 @@ beforeEach(() => {
     posthog.api.get.mockClear()
     global.groupType = undefined
     global.groupTypeIndex = undefined
+    global.getInvoiceTimestamp = INVOICE_EVENT_TIMESTAMP_TYPES['Invoice Period End Date']
 
     mockStorage = new Map()
     storage = {

index.ts

@@ -13,7 +13,7 @@ interface StoredInvoice {
 }
 
 // Keep this in sync with the `invoiceEventTimestamp` choices in config.json!
-const INVOICE_EVENT_TIMESTAMP_TYPES: Record<string, (invoice: StoredInvoice) => Date | undefined> = {
+export const INVOICE_EVENT_TIMESTAMP_TYPES: Record<string, (invoice: StoredInvoice) => Date | undefined> = {
     'Invoice Period End Date': (invoice) => new Date(invoice.period_end * 1000),
     'Invoice Payment Date': (invoice) => {
         // older invoices may have been written without state transition data
@@ -99,8 +99,8 @@ async function sendGroupEvent(invoice, customer, due_last_month, due_total, paid
 
 function last_month(global, invoices: StoredInvoice[], key) {
     const today = new Date()
-    const firstDayThisMonth = Math.floor(new Date(today.getFullYear(), today.getMonth(), 1) / 1000)
-    const firstDayNextMonth = Math.floor(new Date(today.getFullYear(), today.getMonth() + 1, 1) / 1000)
+    const firstDayThisMonth = new Date(today.getFullYear(), today.getMonth(), 1)
+    const firstDayNextMonth = new Date(today.getFullYear(), today.getMonth() + 1, 1)
     return invoices
         .filter((invoice) => {
             const timestamp = global.getInvoiceTimestamp(invoice)