Convert easy entrypoints files to Typescript (#30102)

app/javascript/entrypoints/application.ts

@@ -1,5 +1,5 @@
 import './public-path';
-import main from "mastodon/main";
+import main from 'mastodon/main';
 
 import { start } from '../mastodon/common';
 import { loadLocale } from '../mastodon/locales';
@@ -10,6 +10,6 @@ start();
 loadPolyfills()
   .then(loadLocale)
   .then(main)
-  .catch(e => {
+  .catch((e: unknown) => {
     console.error(e);
   });

app/javascript/entrypoints/error.ts

@@ -2,7 +2,9 @@ import './public-path';
 import ready from '../mastodon/ready';
 
 ready(() => {
-  const image = document.querySelector('img');
+  const image = document.querySelector<HTMLImageElement>('img');
+
+  if (!image) return;
 
   image.addEventListener('mouseenter', () => {
     image.src = '/oops.gif';
@@ -11,4 +13,6 @@ ready(() => {
   image.addEventListener('mouseleave', () => {
     image.src = '/oops.png';
   });
+}).catch((e: unknown) => {
+  console.error(e);
 });

app/javascript/entrypoints/public-path.ts

@@ -2,7 +2,7 @@
 // to share the same assets regardless of instance configuration.
 // See https://webpack.js.org/guides/public-path/#on-the-fly
 
-function removeOuterSlashes(string) {
+function removeOuterSlashes(string: string) {
   return string.replace(/^\/*/, '').replace(/\/*$/, '');
 }
 
@@ -15,7 +15,9 @@ function formatPublicPath(host = '', path = '') {
   return `${formattedHost}/${formattedPath}/`;
 }
 
-const cdnHost = document.querySelector('meta[name=cdn-host]');
+const cdnHost = document.querySelector<HTMLMetaElement>('meta[name=cdn-host]');
 
-// eslint-disable-next-line no-undef
-__webpack_public_path__ = formatPublicPath(cdnHost ? cdnHost.content : '', process.env.PUBLIC_OUTPUT_PATH);
+__webpack_public_path__ = formatPublicPath(
+  cdnHost ? cdnHost.content : '',
+  process.env.PUBLIC_OUTPUT_PATH,
+);

app/javascript/entrypoints/share.tsx

@@ -2,7 +2,7 @@ import './public-path';
 import { createRoot } from 'react-dom/client';
 
 import { start } from '../mastodon/common';
-import ComposeContainer  from '../mastodon/containers/compose_container';
+import ComposeContainer from '../mastodon/containers/compose_container';
 import { loadPolyfills } from '../mastodon/polyfills';
 import ready from '../mastodon/ready';
 
@@ -16,7 +16,7 @@ function loaded() {
 
     if (!attr) return;
 
-    const props = JSON.parse(attr);
+    const props = JSON.parse(attr) as object;
     const root = createRoot(mountNode);
 
     root.render(<ComposeContainer {...props} />);
@@ -24,9 +24,13 @@ function loaded() {
 }
 
 function main() {
-  ready(loaded);
+  ready(loaded).catch((error: unknown) => {
+    console.error(error);
+  });
 }
 
-loadPolyfills().then(main).catch(error => {
-  console.error(error);
-});
+loadPolyfills()
+  .then(main)
+  .catch((error: unknown) => {
+    console.error(error);
+  });