Add TypeScript support for `mastodon` alias and image imports (#24895)

app/javascript/mastodon/components/hashtag.jsx

@@ -5,9 +5,7 @@ import { FormattedMessage } from 'react-intl';
 import PropTypes from 'prop-types';
 import ImmutablePropTypes from 'react-immutable-proptypes';
 import { Link } from 'react-router-dom';
-// @ts-expect-error
 import ShortNumber from 'mastodon/components/short_number';
-// @ts-expect-error
 import Skeleton from 'mastodon/components/skeleton';
 import classNames from 'classnames';
 

app/javascript/types/image.d.ts

@@ -0,0 +1,34 @@
+declare module '*.avif' {
+  const path: string;
+  export default path;
+}
+
+declare module '*.gif' {
+  const path: string;
+  export default path;
+}
+
+declare module '*.jpg' {
+  const path: string;
+  export default path;
+}
+
+declare module '*.jpg' {
+  const path: string;
+  export default path;
+}
+
+declare module '*.png' {
+  const path: string;
+  export default path;
+}
+
+declare module '*.svg' {
+  const path: string;
+  export default path;
+}
+
+declare module '*.webp' {
+  const path: string;
+  export default path;
+}

tsconfig.json

@@ -7,7 +7,16 @@
     "noEmit": true,
     "strict": true,
     "esModuleInterop": true,
-    "skipLibCheck": true
+    "skipLibCheck": true,
+    "baseUrl": "./",
+    "paths": {
+      "mastodon": ["app/javascript/mastodon"],
+      "mastodon/*": ["app/javascript/mastodon/*"]
+    }
   },
-  "include": ["app/javascript/mastodon", "app/javascript/packs"]
+  "include": [
+    "app/javascript/mastodon",
+    "app/javascript/packs",
+    "app/javascript/types"
+  ]
 }