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/redis.ts

@@ -0,0 +1,29 @@
+import Redis from "ioredis";
+import Logger from "./logging/logger";
+
+const options = {
+  maxRetriesPerRequest: 20,
+
+  retryStrategy(times: number) {
+    Logger.warn(`Retrying redis connection: attempt ${times}`);
+    return Math.min(times * 100, 3000);
+  },
+
+  // support Heroku Redis, see:
+  // https://devcenter.heroku.com/articles/heroku-redis#ioredis-module
+  tls:
+    process.env.REDIS_URL && process.env.REDIS_URL.startsWith("rediss://")
+      ? {
+          rejectUnauthorized: false,
+        }
+      : undefined,
+};
+const client = new Redis(process.env.REDIS_URL, options);
+const subscriber = new Redis(process.env.REDIS_URL, options);
+// More than the default of 10 listeners is expected for the amount of queues
+// we're running. Increase the max here to prevent a warning in the console:
+// https://github.com/OptimalBits/bull/issues/1192
+client.setMaxListeners(100);
+subscriber.setMaxListeners(100);
+
+export { client, subscriber };