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/fs.ts

@@ -0,0 +1,27 @@
+import path from "path";
+import fs from "fs-extra";
+
+export function serializeFilename(text: string): string {
+  return text.replace(/\//g, "%2F").replace(/\\/g, "%5C");
+}
+
+export function deserializeFilename(text: string): string {
+  return text.replace(/%2F/g, "/").replace(/%5C/g, "\\");
+}
+
+export function requireDirectory<T>(dirName: string): [T, string][] {
+  return fs
+    .readdirSync(dirName)
+    .filter(
+      (file) =>
+        file.indexOf(".") !== 0 &&
+        file.match(/\.[jt]s$/) &&
+        file !== path.basename(__filename) &&
+        !file.includes(".test")
+    )
+    .map((fileName) => {
+      const filePath = path.join(dirName, fileName);
+      const name = path.basename(filePath.replace(/\.[jt]s$/, ""));
+      return [require(filePath), name];
+    });
+}