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

server/collaboration/utils/markdownToYDoc.ts

@@ -1,13 +1,12 @@
-// @flow
 import { Node, Fragment } from "prosemirror-model";
 import { parser, schema } from "rich-markdown-editor";
 import { prosemirrorToYDoc } from "y-prosemirror";
 import * as Y from "yjs";
-import embeds from "../../../shared/embeds";
+import embeds from "@shared/embeds";
 
 export default function markdownToYDoc(
   markdown: string,
-  fieldName?: string = "default"
+  fieldName = "default"
 ): Y.Doc {
   let node = parser.parse(markdown);
 
@@ -16,9 +15,11 @@ export default function markdownToYDoc(
   // on the server we need to mimic this behavior.
   function urlsToEmbeds(node: Node): Node {
     if (node.type.name === "paragraph") {
+      // @ts-expect-error ts-migrate(2339) FIXME: Property 'content' does not exist on type 'Fragmen... Remove this comment to see the full error message
       for (const textNode of node.content.content) {
         for (const embed of embeds) {
           if (textNode.text && embed.matcher(textNode.text)) {
+            // @ts-expect-error ts-migrate(2322) FIXME: Type 'ProsemirrorNode<Schema<never, never>> | null... Remove this comment to see the full error message
             return schema.nodes.embed.createAndFill({
               href: textNode.text,
             });
@@ -29,6 +30,7 @@ export default function markdownToYDoc(
 
     if (node.content) {
       const contentAsArray =
+        // @ts-expect-error ts-migrate(2339) FIXME: Property 'content' does not exist on type 'Fragmen... Remove this comment to see the full error message
         node.content instanceof Fragment ? node.content.content : node.content;
       node.content = Fragment.fromArray(contentAsArray.map(urlsToEmbeds));
     }
@@ -37,6 +39,5 @@ export default function markdownToYDoc(
   }
 
   node = urlsToEmbeds(node);
-
   return prosemirrorToYDoc(node, fieldName);
 }