fix: eliminate JSX.Element from generated typings

Either add JSDoc or TypeScript annotations so that `Mithril.Children` is always returned in favor of `JSX.Element`.

extensions/flags/js/src/forum/components/FlagList.js

@@ -13,6 +13,9 @@ export default class FlagList extends Component {
     this.state = this.attrs.state;
   }
 
+  /**
+   * @return {import('mithril').Children}
+   */
   view() {
     const flags = this.state.cache || [];
 

extensions/flags/js/src/forum/components/FlagPostModal.js

@@ -24,6 +24,9 @@ export default class FlagPostModal extends Modal {
     return app.translator.trans('flarum-flags.forum.flag_post.title');
   }
 
+  /**
+   * @return {import('mithril').Children}
+   */
   content() {
     if (this.success) {
       return (

extensions/flags/js/src/forum/components/FlagsDropdown.js

@@ -11,6 +11,9 @@ export default class FlagsDropdown extends NotificationsDropdown {
     super.initAttrs(attrs);
   }
 
+  /**
+   * @return {import('mithril').Children}
+   */
   getMenu() {
     return (
       <div className={'Dropdown-menu ' + this.attrs.menuClassName} onclick={this.menuClick.bind(this)}>

extensions/flags/js/src/forum/components/FlagsPage.js

@@ -18,6 +18,9 @@ export default class FlagsPage extends Page {
     this.bodyClass = 'App--flags';
   }
 
+  /**
+   * @return {import('mithril').Children}
+   */
   view() {
     return (
       <div className="FlagsPage">