Don't fail when window._paq is undefined

src/lib/matomo.ts

@@ -3,6 +3,8 @@ import type { ParametricReform } from "$lib/reforms"
 
 function trackEvent(category: string, action: string, name: string) {
   if (browser) {
+    // @ts-expect-error: global variable needed by Matomo.
+    window._paq ??= []
     // @ts-expect-error: global variable needed by Matomo.
     const _paq = window._paq
     _paq.push(["trackEvent", category, action, name])
@@ -27,6 +29,8 @@ function trackEvent(category: string, action: string, name: string) {
 
 function trackSearch(query: string, category: string, resultCount: number) {
   if (browser) {
+    // @ts-expect-error: global variable needed by Matomo.
+    window._paq ??= []
     // @ts-expect-error: global variable needed by Matomo.
     const _paq = window._paq
     _paq.push([
@@ -42,6 +46,8 @@ function trackSearch(query: string, category: string, resultCount: number) {
 // function trackSearchResult(category: string, resultValue: string) {
 //   if (browser) {
 //     // @ts-expect-error: global variable needed by Matomo.
+//     window._paq ??= []
+//     // @ts-expect-error: global variable needed by Matomo.
 //     const _paq = window._paq
 //     _paq.push([
 //       "setCustomUrl",
@@ -85,6 +91,8 @@ export function trackSearchVariable(
 
 export function trackPageView(url: URL, prependDomain: boolean | undefined) {
   if (browser) {
+    // @ts-expect-error: global variable needed by Matomo.
+    window._paq ??= []
     // @ts-expect-error: global variable needed by Matomo.
     const _paq = window._paq
     _paq.push(["setCustomUrl", url.pathname + url.search])
@@ -101,6 +109,8 @@ export function trackParametricReform(
   prependDomain: boolean | undefined,
 ) {
   if (browser) {
+    // @ts-expect-error: global variable needed by Matomo.
+    window._paq ??= []
     // @ts-expect-error: global variable needed by Matomo.
     const _paq = window._paq
     _paq.push([

src/routes/+layout.svelte

@@ -687,7 +687,7 @@
     url: string
   }) {
     // @ts-expect-error: global variable needed by Matomo.
-    window._paq = window._paq ?? []
+    window._paq ??= []
     // @ts-expect-error: global variable needed by Matomo.
     const _paq = window._paq
     /* tracker methods like "setCustomDimension" should be called before "trackPageView" */