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/presenters/policy.ts

@@ -0,0 +1,20 @@
+import { User } from "@server/models";
+
+type Policy = {
+  id: string;
+  abilities: Record<string, boolean>;
+};
+
+export default function present(
+  // @ts-expect-error ts-migrate(2749) FIXME: 'User' refers to a value, but is being used as a t... Remove this comment to see the full error message
+  user: User,
+  objects: Record<string, any>[]
+): Policy[] {
+  // eslint-disable-next-line @typescript-eslint/no-var-requires
+  const { serialize } = require("../policies");
+
+  return objects.map((object) => ({
+    id: object.id,
+    abilities: serialize(user, object),
+  }));
+}