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/utils/parseDocumentIds.test.ts

@@ -0,0 +1,30 @@
+import parseDocumentIds from "./parseDocumentIds";
+
+it("should not return non links", () => {
+  expect(parseDocumentIds(`# Header`).length).toBe(0);
+});
+it("should return an array of document ids", () => {
+  const result = parseDocumentIds(`# Header
+  
+  [internal](/doc/test-456733)
+  `);
+  expect(result.length).toBe(1);
+  expect(result[0]).toBe("test-456733");
+});
+it("should not return duplicate document ids", () => {
+  expect(parseDocumentIds(`# Header`).length).toBe(0);
+  const result = parseDocumentIds(`# Header
+  
+  [internal](/doc/test-456733)
+
+  [another link to the same doc](/doc/test-456733)
+  `);
+  expect(result.length).toBe(1);
+  expect(result[0]).toBe("test-456733");
+});
+it("should not return non document links", () => {
+  expect(parseDocumentIds(`[google](http://www.google.com)`).length).toBe(0);
+});
+it("should not return non document relative links", () => {
+  expect(parseDocumentIds(`[relative](/developers)`).length).toBe(0);
+});