[Beta] Lazy-load analytics

beta/src/components/Layout/Feedback.tsx

@@ -4,8 +4,7 @@
 
 import * as React from 'react';
 import {useRouter} from 'next/router';
-// @ts-ignore
-import galite from 'ga-lite';
+import {ga} from '../../utils/analytics';
 
 export function Feedback({onSubmit = () => {}}: {onSubmit?: () => void}) {
   const {pathname} = useRouter();
@@ -48,7 +47,7 @@ const thumbsDownIcon = (
 function sendGAEvent(isPositive: boolean) {
   // Fragile. Don't change unless you've tested the network payload
   // and verified that the right events actually show up in GA.
-  galite(
+  ga(
     'send',
     'event',
     'button',

beta/src/pages/_app.tsx

@@ -5,8 +5,7 @@
 import * as React from 'react';
 import {AppProps} from 'next/app';
 import {useRouter} from 'next/router';
-// @ts-ignore
-import galite from 'ga-lite';
+import {ga} from '../utils/analytics';
 import '@docsearch/css';
 import '../styles/algolia.css';
 import '../styles/index.css';
@@ -17,11 +16,11 @@ const EmptyAppShell: React.FC = ({children}) => <>{children}</>;
 
 if (typeof window !== 'undefined') {
   if (process.env.NODE_ENV === 'production') {
-    galite('create', process.env.NEXT_PUBLIC_GA_TRACKING_ID, 'auto');
+    ga('create', process.env.NEXT_PUBLIC_GA_TRACKING_ID, 'auto');
   }
   const terminationEvent = 'onpagehide' in window ? 'pagehide' : 'unload';
   window.addEventListener(terminationEvent, function () {
-    galite('send', 'timing', 'JS Dependencies', 'unload');
+    ga('send', 'timing', 'JS Dependencies', 'unload');
   });
 }
 
@@ -29,8 +28,8 @@ export default function MyApp({Component, pageProps}: AppProps) {
   const router = useRouter();
   React.useEffect(() => {
     const handleRouteChange = (url: string) => {
-      galite('set', 'page', url);
-      galite('send', 'pageview');
+      ga('set', 'page', url);
+      ga('send', 'pageview');
     };
     router.events.on('routeChangeComplete', handleRouteChange);
     return () => {

beta/src/utils/analytics.ts

@@ -2,77 +2,25 @@
  * Copyright (c) Facebook, Inc. and its affiliates.
  */
 
-const createFunctionWithTimeout = (
-  callback: () => void,
-  opt_timeout = 1000
-) => {
-  let called = false;
-  const raceCallback = () => {
-    if (!called) {
-      called = true;
-      callback();
-    }
-  };
-  setTimeout(raceCallback, opt_timeout);
-  return raceCallback;
-};
+let buffer: Array<any> = [];
+let galite: null | Function = null;
+let galitePromise: null | Promise<any> = null;
 
-interface CustomEvent {
-  /** The value that will appear as the event action in Google Analytics Event reports. */
-  action: string;
-  /** The category of the event. */
-  category?: string;
-  /** The label of the event. */
-  label?: string;
-  /** A non-negative integer that will appear as the event value. */
-  value: number;
-  /**
-   * Whether the even is non-interactive
-   * @see https://support.google.com/analytics/answer/1033068#NonInteractionEvents
-   * @default false
-   */
-  nonInteraction?: boolean;
-  /**
-   * A function that gets called as soon as an event has been successfully sent.
-   * @see https://developers.google.com/analytics/devguides/collection/gtagjs/sending-data
-   */
-  hitCallback?: () => void;
-  /**
-   * Max ms timeout for callback
-   * @default 1000
-   */
-  callbackTimeout?: number;
-}
-/**
- * This allows the user to create custom events within their Next projects.
- *
- * @see https://developers.google.com/analytics/devguides/collection/analyticsjs/field-reference#events
- */
-export function trackCustomEvent({
-  category,
-  action,
-  label,
-  value,
-  nonInteraction = false,
-  hitCallback,
-  callbackTimeout = 1000,
-}: CustomEvent) {
-  if (typeof window !== `undefined` && (window as any).gtag) {
-    const trackingEventOptions: any = {
-      event_category: category,
-      event_action: action,
-      event_label: label,
-      value,
-      non_interaction: nonInteraction,
-    };
-
-    if (hitCallback && typeof hitCallback === `function`) {
-      trackingEventOptions.event_callback = createFunctionWithTimeout(
-        hitCallback,
-        callbackTimeout
-      );
-    }
-
-    (window as any).gtag(`event`, trackingEventOptions);
+export function ga(...args: any[]): void {
+  if (typeof galite === 'function') {
+    galite.apply(null, args);
+    return;
+  }
+  buffer.push(args);
+  if (!galitePromise) {
+    // @ts-ignore
+    galitePromise = import('ga-lite').then((mod) => {
+      galite = mod.default;
+      galitePromise = null;
+      buffer.forEach((args) => {
+        mod.default.apply(null, args);
+      });
+      buffer = [];
+    });
   }
 }