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/middlewares/errorHandling.ts

@@ -0,0 +1,57 @@
+import { Context } from "koa";
+import { snakeCase } from "lodash";
+import Sequelize from "sequelize";
+
+export default function errorHandling() {
+  return async function errorHandlingMiddleware(
+    ctx: Context,
+    next: () => Promise<any>
+  ) {
+    try {
+      await next();
+    } catch (err) {
+      ctx.status = err.status || 500;
+      let message = err.message || err.name;
+      let error;
+
+      if (err instanceof Sequelize.ValidationError) {
+        // super basic form error handling
+        ctx.status = 400;
+
+        if (err.errors && err.errors[0]) {
+          message = `${err.errors[0].message} (${err.errors[0].path})`;
+        }
+      }
+
+      if (message.match(/Not found/i)) {
+        ctx.status = 404;
+        error = "not_found";
+      }
+
+      if (message.match(/Authorization error/i)) {
+        ctx.status = 403;
+        error = "authorization_error";
+      }
+
+      if (ctx.status === 500) {
+        message = "Internal Server Error";
+        error = "internal_server_error";
+        ctx.app.emit("error", err, ctx);
+      }
+
+      ctx.body = {
+        ok: false,
+        error: snakeCase(err.id || error),
+        status: err.status,
+        message,
+        data: err.errorData,
+      };
+
+      // @ts-expect-error ts-migrate(2571) FIXME: Object is of type 'unknown'.
+      if (!ctx.body.data) {
+        // @ts-expect-error ts-migrate(2571) FIXME: Object is of type 'unknown'.
+        delete ctx.body.data;
+      }
+    }
+  };
+}