Add trackCustomEvent [Fixes #34]

src/index.js

@@ -1 +1,25 @@
-// noop
+/**
+ * Create custom Matomo event.
+ *
+ * @see https://matomo.org/docs/event-tracking/
+ */
+export const trackCustomEvent = ({
+  eventCategory,
+  eventAction,
+  eventName,
+  eventValue
+}) => {
+  if (process.env.NODE_ENV === 'production' || window.dev === true) {
+    if (!window._paq) return
+
+    const { _paq, dev } = window
+
+    _paq.push([`trackEvent`, eventCategory, eventAction, eventName, eventValue])
+
+    if (dev) {
+      console.debug(
+        `[Matomo] event tracked, category: ${eventCategory}, action: ${eventAction}, name: ${eventName}, value: ${eventValue}`
+      )
+    }
+  }
+}