chore: Move to Typescript (#2783)

This PR moves the entire project to Typescript. Due to the ~1000 ignores this will lead to a messy codebase for a while, but the churn is worth it – all of those ignore comments are places that were never type-safe previously.

closes #1282

shared/embeds/YouTube.tsx

@@ -0,0 +1,28 @@
+import * as React from "react";
+import Frame from "./components/Frame";
+
+const URL_REGEX = /(?:https?:\/\/)?(?:www\.)?youtu\.?be(?:\.com)?\/?.*(?:watch|embed)?(?:.*v=|v\/|\/)([a-zA-Z0-9_-]{11})$/i;
+type Props = {
+  isSelected: boolean;
+  attrs: {
+    href: string;
+    matches: string[];
+  };
+};
+
+export default class YouTube extends React.Component<Props> {
+  static ENABLED = [URL_REGEX];
+
+  render() {
+    const { matches } = this.props.attrs;
+    const videoId = matches[1];
+    return (
+      <Frame
+        {...this.props}
+        // @ts-expect-error ts-migrate(2322) FIXME: Type '{ src: string; title: string; isSelected: bo... Remove this comment to see the full error message
+        src={`https://www.youtube.com/embed/${videoId}?modestbranding=1`}
+        title={`YouTube (${videoId})`}
+      />
+    );
+  }
+}