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/routes/api/index.test.ts

@@ -0,0 +1,21 @@
+// @ts-expect-error ts-migrate(7016) FIXME: Could not find a declaration file for module 'fetc... Remove this comment to see the full error message
+import TestServer from "fetch-test-server";
+import webService from "@server/services/web";
+import { flushdb } from "@server/test/support";
+
+const app = webService();
+const server = new TestServer(app.callback());
+beforeEach(() => flushdb());
+afterAll(() => server.close());
+describe("POST unknown endpoint", () => {
+  it("should be not found", async () => {
+    const res = await server.post("/api/blah");
+    expect(res.status).toEqual(404);
+  });
+});
+describe("GET unknown endpoint", () => {
+  it("should be not found", async () => {
+    const res = await server.get("/api/blah");
+    expect(res.status).toEqual(404);
+  });
+});