refactor(plugin-google-gtag, plugin-google-analytics): migrate packages to TS (#5561)

* migration

* Move to devDeps

* Use type assertion

packages/docusaurus-plugin-google-analytics/src/analytics.ts

@@ -13,7 +13,7 @@ export default (function () {
   }
 
   return {
-    onRouteUpdate({location}) {
+    onRouteUpdate({location}: {location: Location}) {
       // Set page so that subsequent hits on this page are attributed
       // to this page. This is recommended for Single-page Applications.
       window.ga('set', 'page', location.pathname);

packages/docusaurus-plugin-google-analytics/src/index.ts

@@ -5,12 +5,15 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-const path = require('path');
+import path from 'path';
+import type {LoadContext, Plugin, HtmlTags} from '@docusaurus/types';
+import type {ThemeConfig} from '@docusaurus/plugin-google-analytics';
 
-module.exports = function (context) {
-  const {siteConfig} = context;
-  const {themeConfig} = siteConfig;
-  const {googleAnalytics} = themeConfig || {};
+export default function pluginGoogleAnalytics(context: LoadContext): Plugin {
+  const {
+    siteConfig: {themeConfig},
+  } = context;
+  const {googleAnalytics} = themeConfig as ThemeConfig;
 
   if (!googleAnalytics) {
     throw new Error(
@@ -66,8 +69,8 @@ module.exports = function (context) {
               src: 'https://www.google-analytics.com/analytics.js',
             },
           },
-        ],
+        ] as HtmlTags,
       };
     },
   };
-};
+}

packages/docusaurus-plugin-google-analytics/src/plugin-google-analytics.d.ts

@@ -0,0 +1,13 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+export interface ThemeConfig {
+  googleAnalytics?: {
+    trackingID: string;
+    anonymizeIP?: boolean;
+  };
+}

packages/docusaurus-plugin-google-analytics/src/types.d.ts

@@ -0,0 +1,12 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+/// <reference types="@docusaurus/module-type-aliases" />
+
+interface Window {
+  ga: (command: string, ...fields: string[]) => void;
+}