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/policies/attachment.ts

@@ -0,0 +1,24 @@
+import { Attachment, User, Team } from "@server/models";
+import policy from "./policy";
+
+const { allow } = policy;
+
+allow(User, "createAttachment", Team, (user, team) => {
+  if (!team || user.isViewer || user.teamId !== team.id) return false;
+  return true;
+});
+
+allow(User, "read", Attachment, (actor, attachment) => {
+  if (!attachment || attachment.teamId !== actor.teamId) return false;
+  if (actor.isAdmin) return true;
+  if (actor.id === attachment.userId) return true;
+  return false;
+});
+
+allow(User, "delete", Attachment, (actor, attachment) => {
+  if (actor.isViewer) return false;
+  if (!attachment || attachment.teamId !== actor.teamId) return false;
+  if (actor.isAdmin) return true;
+  if (actor.id === attachment.userId) return true;
+  return false;
+});